Make Crystal Earphone/Earpiece for Crystal Radio - Homemade

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ความคิดเห็น • 229

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว +13

    Yes. In fact I used one of those greeting card crystals in my "Piezoelectric generator LED lit by rain water" video. But I think more and more these days the greeting cards contain electromagnetic speakers. It's a little difficult but if you go to the card store looking for them and want to know which type is in the card without tearing it apart, the electromagnetic speaker ones have a Neodymium magnet in them, so test the cards with something ferromagnetic, some keys for example.

  • @MrBrew4321
    @MrBrew4321 8 ปีที่แล้ว +7

    I had that idea for the first crystal radio I tried to make. When it failed to produce any sound I assumed the microwave piezo speaker crystal was to big or something. Now that I've made some more advanced crystal radios and seen this, I'll probably dig those old microwave parts out of a box and give it a go again. Thanks for sharing!

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว +5

    Yeah, I keep finding new things in this microwave oven. It really is a treasure trove. Took from capacitors from the board too while I was at it.
    Glad to hear you enjoyed the video.

  • @TheKingofRandom
    @TheKingofRandom 12 ปีที่แล้ว +7

    Awesome that this works isn't it! What did you use for ground? Did you run it through the ground in your wall socket?

    • @-p5251
      @-p5251 3 ปีที่แล้ว

      I've found ur old days comments, :yay:
      Nothing much :v

  • @TheKingofRandom
    @TheKingofRandom 12 ปีที่แล้ว +10

    That's safer than the way I usually do it :) I think I also saw you do that in one of your previous videos? Cool Steve!

  • @TheKingofRandom
    @TheKingofRandom 12 ปีที่แล้ว +15

    That's very creative Steve :) I built a radio just like that about 3 years ago and had great success hooking the antenna to my drain pipe on the side of the house. Would a longer antenna make the signal stronger for you?

  • @TheKingofRandom
    @TheKingofRandom 12 ปีที่แล้ว +17

    Cool! Thanks for the tip!

    • @fidel6012
      @fidel6012 4 ปีที่แล้ว +1

      never thought i would find tkor here but okay

    • @juntendo6104
      @juntendo6104 4 ปีที่แล้ว

      lol only 2 likes

    • @hinbikie4704
      @hinbikie4704 ปีที่แล้ว

      Surprising

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    It was a pleasure meeting you guys too! It's rare that I meet filmmakers in person. Too bad I'm here for only a month and back to Ottawa in January otherwise we could have done some movies together if you were so inclined.

  • @johnmasters101
    @johnmasters101 2 หลายเดือนก่อน

    I so enjoy learning how you make components at home. Great diy methodology and philosophy. Thanks

  • @alasdairwardle8427
    @alasdairwardle8427 7 ปีที่แล้ว

    Great explanation. Just found an old microwave oven at the side of the road here in Australia. Found the piezoelectric 'beeper' and removed it. I am now going to get the other bits and pieces and see if I can mke my own crystal set! I might need help from grandchildren. Thank you.

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว +1

    Thanks. And yup, been there done that. Of course you need something to tap or flex the crystal in order to get it to light the LED. I've even used water drops, dropping from a 4 foot height to tap on the crystal.

  • @jecosad5955
    @jecosad5955 5 ปีที่แล้ว +10

    im here because of Dr. Stone manga. You will survive the stone age, sir

    • @OdisseuBR
      @OdisseuBR 10 หลายเดือนก่อน +1

      Great reference!

  • @mnpd3
    @mnpd3 5 ปีที่แล้ว +3

    Hey, try this.... use a resistor and short out the piezo's terminals. The value varies, but 10k to 12K seems to work best. Easiest way to determine the correct resistance is to use a low-step resistance substitution box, or a variable resistor to find the best value. Depending on your method, you may then want to read the resistance you use with the VOM. Bet you'll be surprised by the improved audio.

  • @RimstarOrg
    @RimstarOrg  11 ปีที่แล้ว

    Thanks! That's yet another source of piezo crystals. Good to know. And I'm glad you like my videos! Thanks for the feedback.

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    Yup, I showed it in my "Crystal Radio Troubleshooting and Tips" video. Of course the other issue is, is the ground hole in the wall socket connected to ground? It is in only one socket in my whole apartment. To check, I use my voltmeter on the AC scale to test voltage between neutral (the taller of the two) and ground holes. In North America there should be close to 0 volts between them.

  • @mhamblin00
    @mhamblin00 7 หลายเดือนก่อน

    I love how you re-use found objects. Especially since Radio Shacks are harder to find these days. I'd love to see a video on where and how to collect electronic components from found objects.
    Also a video on how to make a morse code practicing sound generator. Thanks

  • @paulocavutto3601
    @paulocavutto3601 ปีที่แล้ว

    This is the most difficult part to find to assemble a galena radio. Thank you so much for the tip.

  • @billblakovich4301
    @billblakovich4301 9 ปีที่แล้ว +1

    I watched another video of yours before and it was about the headphone speakers and the transformers, I just wanted to let you know next time you take the small transformer off a circuit board the solder side on the bottom of the board tells you which coil is which where it solders in most mocrowaves

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    I bought a standalone plug, ones for making your own chords, and hooked up only the ground prong. Basically a one-wire extension chord. I plug that into the wall socket.

  • @Slider2732
    @Slider2732 12 ปีที่แล้ว

    Just spent ages looking for the board from the microwave I took apart...but got tons of regular piezo's. Always wondered about a casing and here it is ! lol. Could do with finding that board though.
    Enjoyed that, completely practical and useful as always :)

  • @CaptWindShear
    @CaptWindShear 11 ปีที่แล้ว

    Thanks man! I am restarting a hobby of crystal radios after nearly 40 years to find almost everything involved is scarce, now. The video is pure gold and like made for my case; I have a junked microwave in the basement. I was wondering if those tiny diodes on the PCB might be useful, too, even if a bias current might be needed, and there is a useful looking transformer there.
    Have not had the time to look at all your videos, but nice channel. Subscribed!

    • @RimstarOrg
      @RimstarOrg  11 ปีที่แล้ว +1

      Welcome to my channel! I'm glad you're finding it useful. Sounds like you're going to have some fun, biasing a diode in a radio is something I haven't done yet. In case you haven't seen it, and in case it helps, there's a Crystal Radio playlist on my main channel page that has all the related videos. Thanks for watching!

  • @RimstarOrg
    @RimstarOrg  11 ปีที่แล้ว

    Cool! Have fun making it and let us know how it goes. And if your Ma is talking only about the capacitor then I guess she just volunteered to make that part of it! :)

  • @helraiser666painkil
    @helraiser666painkil 2 ปีที่แล้ว

    Thank you for the great tip I've thrown loads of microwaves out through the years and I have never taken one apart before like yourself and that is very clever the way you made that crystal ear piece just with a part out of a microwave and then you hot glued everything together which was very smart so the next time my microwave goes I'll definitely give that a go and I will try it out on my amateur radio equipment and see what it's like so again thanks for the tip. Stephen M3SNV 73's.

    • @RimstarOrg
      @RimstarOrg  2 ปีที่แล้ว

      Just be careful when you start digging into the side of the microwave oven area where electronics are. In most ovens, you'll see a largish electrolytic capacitor (usually at the bottom near the rear of that side) and it may still have some charge meaning it may give you a shock. Be sure to discharge the two terminals of the capacitor without touching it yourself, for example with the metal of a screwdriver or something. Having said that, none of the one's I've opened ever gave any spark when discharging it but it's best to be careful.

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    Thanks Grant. Drain pipe? I'll have to try that. A longer antenna should help. I use three 15' wires in parallel and have tried one 50' length but I guess they were equivalent since there was no improvement.

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    A timer that you spin/dial. That does sound like an old design. As you say, it's probably a mechanical bell. There's no harm in opening it up and checking for the fun of it. Just be careful not to touch the high voltage capacitor. I'd say the capacitor is usually in the bottom, rear on the side with the electronics but with your microwave oven it may not be.

  • @bobsimmons5274
    @bobsimmons5274 ปีที่แล้ว

    Those elements ( unmounted ) are called "piezo benders", you can buy them separately lots of places, including digikey, quite cheap. They are used for all sorts of things including ignition generators in trigger operated barbecue starters, stove top igniters, butane cigarette lighters, air humidifiers ( they are used to boil the water with explosive sound waves ) and the Webb telescope where they are used to "nudge" the individual mirrors just a tiny fraction of an inch, to align them all perfectly.

  • @jolovesvlad
    @jolovesvlad 11 ปีที่แล้ว

    Thanks for these great videos! I was looking for a cheap source of piezo speakers and found the easiest for me was to buy a window alarm from Dollar Tree. This works great because it also provides the housing.

  • @Mr.Engine993
    @Mr.Engine993 4 หลายเดือนก่อน

    The component you salvaged from the microwave is called passive buzzer. You can buy these for next to nothing at any electronics supply store. You can even get ones with 40-50mm diameter for louder sound

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    I tried that. The crystal radio didn't put out enough power to make it work. I did get that to work with a clock radio though, but that has an amplifier. If you're curious, see my video "How to Make Piezoelectric Crystal Speaker" (you can find it on my channel page.)

  • @f.kharrasi4333
    @f.kharrasi4333 9 ปีที่แล้ว +1

    Hello and thanks for your very informative video, the phone can be used capsules? Amir from Ahwaz, Iran

    • @RimstarOrg
      @RimstarOrg  9 ปีที่แล้ว +2

      +‫فضل‌اله خراسی‬‎ Hi Amir. There must be something wrong with your translation. What do you mean by "phone" and "capsules"?

  • @RimstarOrg
    @RimstarOrg  9 ปีที่แล้ว +2

    +Avichai Marcovitch I give two links in the video description to where you can buy crystal earpieces (piezoelectric speakers) online.
    PS There's no Reply button under your comment because of your Google+ settings.
    - go to your Google+ page,
    - in the top, right corner click on your thumbnail icon,
    - in the popup that appears, click on "Settings".
    - for the 2nd question down "Who can comment on your public posts?" set it to "Anyone".

    • @avimarc
      @avimarc 9 ปีที่แล้ว

      RimstarOrg Thanks for the quick reply ,fixed the reply ability as well.
      I've been having some difficulty finding a site that can ship a crystal earphone to my country without insane costs, so i wanted to make one from a piezoelectric buzzer like in your video
      therefore it would be greatly appreciated if you could recommend a buzzer to use (im assuming those would be more common and easier to find a site that delivers to Israel :)

    • @RimstarOrg
      @RimstarOrg  9 ปีที่แล้ว

      Avichai Marcovitch I don't have any specific recommendation. This is the one I have and that works www.thesource.ca/estore/product.aspx?language=en-CA&catalog=Online&category=CLRBatteries_Cables&product=2730060
      Probably a lot of others work too. You should be able to find one in an electronics or hardware store in Israel.

  • @PSKResearch
    @PSKResearch 2 ปีที่แล้ว

    Try using those small cheap piezoelectric tweeters.
    Although they're used with 8 ohm speakers, their impedance is actually
    in the kilo-ohms (and highest below 15khz).... they're just really
    efficient.

  • @OFP857BR549
    @OFP857BR549 11 ปีที่แล้ว

    Nifty! Me and pa are gonna make a similar radio like you showed. My ma ain't listnin to me 'bout how to make it. She just talks about the capacitor! Still, thanks for the step by step jazz. It was real helpful!

  • @vivetu
    @vivetu 8 หลายเดือนก่อน

    Great idea!!! Thanks from Spain.

  • @letsfightdeepstate4880
    @letsfightdeepstate4880 2 ปีที่แล้ว +1

    Very nice. I was thinking about buying very cheap 100 piezo elements from aliexpress. But i just wonder how much impact does the impedance have? though they moastly are arround 300 ohm on this elements, and a crystal earpiece use to have 20k impedance. Any idea about that?. Would be very easy to make perfect earpieces with a 3d printer and blender i think.

    • @RimstarOrg
      @RimstarOrg  2 ปีที่แล้ว

      With a normal crystal radio, you need high impedance, as you say 20k. For low impedance you can add a transformer. For example, normal earbuds are low impedance, tens of ohms, but with a transformer, they work, though there are more losses. I did that here in this video th-cam.com/video/GCh2LVHUavQ/w-d-xo.html . And great idea about using a 3D printer to make the case! I didn't have a 3D printer back then but that should work well.

    • @letsfightdeepstate4880
      @letsfightdeepstate4880 2 ปีที่แล้ว

      @@RimstarOrg Thanks for response. Yes i tried to find these elements with higher impedance, but no luck so far. But same time in this video it seems like it works well to use this traditional piezo elements for a crystal receiver. Very nice idea to use a transformer then to get higher impedance. Will make some experiments with this and buy the one labeled 300 ohms impedance to check it. I can not use a crystal receiver here in Sweden then, though to far from a transmitter, but i have small low voltage receivers i have made that needs these crystal earpieces to. Yeah same with me, i had my first printer 2 weeks ago.

    • @letsfightdeepstate4880
      @letsfightdeepstate4880 2 ปีที่แล้ว

      @@RimstarOrg tried post a link to a 3d model for earpiece i made, but it was deleted. No idea why?

    • @RimstarOrg
      @RimstarOrg  2 ปีที่แล้ว +1

      I guess youtube's algorithm wrongly decided it was spam. I don't see it in my list of comments for review so the algorithm must have rejected it completely.

    • @letsfightdeepstate4880
      @letsfightdeepstate4880 2 ปีที่แล้ว

      @@RimstarOrg yeah i guess so to.

  • @makerj101
    @makerj101 12 ปีที่แล้ว

    Very ingenues! You can power a LED with most piezoelectric crystals. The bigger the better.

    • @barrykelly2722
      @barrykelly2722 5 ปีที่แล้ว

      I wanna know how. Please tell me...please.

  • @mnpd3
    @mnpd3 9 ปีที่แล้ว

    I've used piezoelectric elements too for crystal radio work, but I always have to wire a resistor of 10k-12k across the piezo leads to get any volume. Dunno, maybe the radio or the piezo has a resistance built in. It's a good cheap way you describe, but in case you don't have an old microwave sitting in the corner, an even louder piezo is the Mallory FT-417 --- a very large device. You can use a single one with the resistor wired across the red and black leads. Or, for true headphones use two elements ---- simply tie the red wire of one piezo to the black wire of the other. You are left then with one red and one black lead. Wire the above mentioned resistor across the remaining leads, then apply the crystal radio's audio to the red lead with the black one going to ground. I've found these elements rival the old military sound-powered elements even when they are well adjusted. Many hobbyists mount the elements inside a pair of soundproof earmuffs after removing the foam.

    • @RimstarOrg
      @RimstarOrg  9 ปีที่แล้ว

      +mnpd3 My understanding is that at least one reason a resistor across the piezo leads helps is if your diode doesn't have enough leakage for each reverse cycle. It hasn't made a noticeable difference for me in the past, probably because my diodes have enough leakage.
      A google search for Mallory FT-417 and variations didn't turn up anything relevant. Is that a speaker or just the piezo crystal?
      I've always wanted to try making headphones. Just a question of too much on the todo list. :)

    • @RimstarOrg
      @RimstarOrg  9 ปีที่แล้ว

      +mnpd3 Nevermind re the Mallory FT-417. I saw your other comment about it below.

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    Glad you like it.

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    I don't know the substance. It looks like the same type of material as in piezo disks you find in commercially available crystal earpieces, gift card speakers and piezo buzzers, in case that helps you find out. The use in a microwave oven is for the speaker that beeps when something is cooked.

  • @researchandbuild1751
    @researchandbuild1751 6 ปีที่แล้ว

    By the way if you put a choke across Diode input to ground , something like 25mH, it will also greatly increase the performance of the crystal set. It gives a DC return path for the diode while blocking the RF frequencies and forcing them to go through the diode.
    So what I mean is you put a choke just before the diode, across to ground, a nice high value one that has a high impedance at AM frequencies. 25mH should do fine. To the RF it looks like a giant resistor so it doesn't load things down. But for the diode it's like a DC path to "complete the circuit" that doesn't have to go through the earphone - you will get much better signal with less distortion

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    My pleasure.

  • @RimstarOrg
    @RimstarOrg  11 ปีที่แล้ว

    There are some links in the description below this video to where you can buy them online.

  • @marieomagpie
    @marieomagpie 12 ปีที่แล้ว

    really I thought you had two. what where you using to listen to your crystal radio earlier? I think it is very much the same thing.

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    Oh cool. Just had a look at their website... things that make all sorts of sounds.

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    What are "imtes"? I assume a typo but for 0.12$, I'd really like to know. That's a lot cheaper than a regular crystal earpiece.

  • @MrUbiquitousTech
    @MrUbiquitousTech 8 ปีที่แล้ว +3

    Nicely done, thanks for sharing!

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    Thanks! Glad you liked it.

  • @MarcusTheHeard19
    @MarcusTheHeard19 12 ปีที่แล้ว

    Interesting solution ill have to try it. Glad I met you while we were shooting that movie

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    You're welcome. Thanks for letting me know.

  • @Oinikis
    @Oinikis 12 ปีที่แล้ว

    ye, i saw that. do you know what substance is used in these things, and why does the microwave needs a piezoelectric crystal?

  • @youssefmoawfy9545
    @youssefmoawfy9545 10 หลายเดือนก่อน

    What about a piezoelectric disk or piezo buzzer? I was working on a wireless telegraph project for physics class and then I realized that we can transmit sound just by changing the resistance/voltage. I've tried making a microphone by changing the length of the circuit using the force of a sound wave (like a phonograph) but it only makes noise. I gusse it can work as a speaker as well

    • @RimstarOrg
      @RimstarOrg  10 หลายเดือนก่อน

      Yes, a piezoelectric disk will for it too. That's what's inside this one from the microwave oven and that's what's in the regular piezo earpieces. As for a piezo buzzer, it depends on if there's any other circuitry in the buzzer that might interfere. I've used one as a speaker in this other video th-cam.com/video/b4vr1aE0zzw/w-d-xo.html

  • @hili467
    @hili467 10 ปีที่แล้ว

    I don't understand what I'm looking at when you show the crystal side. is there a wire soldered directly onto the face of the crystal and the other one soldered closer to the side?

    • @RimstarOrg
      @RimstarOrg  10 ปีที่แล้ว

      hi li The whole thing is what looks like a brass disk onto which is coated the whitish crystal. One wire is soldered to the brass disk (the connection that's closer to the side), so it electrically makes contact with the side of the whitish crystal that we can't see. The other wire is somehow soldered to the side of the whitish crystal that we can see but I don't know how that's done. I just looked at another one I have and it does appear to be soldered directly to the crystal, though maybe it's soldered through it (?).In commercially made crystal earpieces the brass disk is instead a flexible foil material that's held under tension by the earpiece's plastic case. I think that's what makes them far more sensitive and produce a louder sound.

    • @hili467
      @hili467 10 ปีที่แล้ว

      fascinating. Thank you for your excellent reply.

  • @ernie4886
    @ernie4886 7 ปีที่แล้ว +1

    Warning. Discharge big capacitor with a high insulation screwdriver before touching inside the electronic side of a microwave owen. Even if the plug is not conected to the wall. Voltages about 3000 volts can be present before discharging.

    • @RimstarOrg
      @RimstarOrg  7 ปีที่แล้ว

      Definitely. Thanks.

  • @avimarc
    @avimarc 9 ปีที่แล้ว

    Could you recommend a piezoelectric speaker to purchase for this project? (or at least recommended technical data like operating voltage)

  • @SleepyMars-fz9bu
    @SleepyMars-fz9bu 6 หลายเดือนก่อน

    Thanks! I have made a crystal earphone with the buzzer of a multimeter

  • @RimstarOrg
    @RimstarOrg  11 ปีที่แล้ว

    Yeah, it's pretty time consuming to do subtitles so only a few of my videos have them so far. Meanwhile, the automatically generated ones are good if you ever need a laugh. :)

  • @janetwinslow2039
    @janetwinslow2039 9 ปีที่แล้ว

    Nice use of a piezto sounder. Given me some good ideas.
    (Interesting automatic voice-to-text subtitles! Can they be turned off?)

    • @RimstarOrg
      @RimstarOrg  9 ปีที่แล้ว

      +Janet Winslow Cool. Glad I could stimulate some ideas. Re the subtitles, click on the CC button at the bottom of the video to turn them on or off. Hmmm... it's indicating that I've add captions but I never did for that particular video. Normally if there are only the automatic ones then it doesn't indicate beside the video name that there some (EDIT: I just now removed the captions that it thought I'd added, but didn't. Thanks!)

    • @janetwinslow2039
      @janetwinslow2039 9 ปีที่แล้ว

      OK, thanks for the info. I didn't think you added them on purpose. They were obviously automatically generated and worse than useless!

    • @RimstarOrg
      @RimstarOrg  9 ปีที่แล้ว

      +Janet Winslow They were both obviously automatically generated, but there was a glitch since there should have been only one automatically generated one. When I 1st read your comment, I went and looked and there was a second one which shouldn't have been there and it was telling me that I'd added it, when I hadn't. So thanks for bringing it up even though it looked automatically generated.

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    It's surprising they don't make the fuse more easily accessible and put in microwave oven manuals that it should be checked the the microwave stops working.

  • @RimstarOrg
    @RimstarOrg  9 ปีที่แล้ว

    +Dev TheHam What does your plain old piezo element look like? Can you be more specific?
    PS There's no Reply button under your comment because of your Google+ settings.
    - go to your Google+ page,
    - in the top, right corner click on your thumbnail icon,
    - in the popup that appears, click on "Settings".
    - for the 2nd question down "Who can comment on your public posts?" set it to "Anyone".

  • @devtheham9175
    @devtheham9175 9 ปีที่แล้ว

    Would a plain old piezo element work for it? Have a couple lying around from a previous project

  • @CAPTAINSSBN
    @CAPTAINSSBN 10 ปีที่แล้ว

    If you leave it on what happens to the output? does it get more intense with time?

    • @RimstarOrg
      @RimstarOrg  10 ปีที่แล้ว

      ***** No, the output stays the same.

    • @mnpd3
      @mnpd3 9 ปีที่แล้ว

      +RimstarOrg
      Yep, output is constant depending on station strength. One tip though --- if any crystal element stops working altogether, try a moderate tap or drop against a hard surface to get it going again. Sometimes these crystals will develop a charged polarity and have to be moved to discharge it (my theory anyway ---- in any case the thump or drop works).

  • @najroe
    @najroe 7 หลายเดือนก่อน

    easy fir most to achive
    I thought I would see a rochelke salt crystal grown, crystal then sandwiched between two pieces of silver foil with wires atached, now difficult part, which way does it deflect most? largest deflection direction is determined by some neans.
    now crystal is connected to a beam armature so max deflection is achieved, end of beam then linked to a transducer membrane (usually aluminium foil). then something like the enclosure you made is fitted.
    This us nice though, relatively easy to do
    with care it can be dobe without a soldering iron by cutting away the circuitboard around the solder holding the transducer carefully

    • @RimstarOrg
      @RimstarOrg  7 หลายเดือนก่อน +1

      I use my rochelle salt crystal in this video th-cam.com/video/0-PParSmwtE/w-d-xo.html , mostly as a speaker though I create a small earpiece sized one at around seven minutes and twenty seconds into the video. I tested the polarity of that crystal in this other video th-cam.com/video/R9m79oWdOZI/w-d-xo.html

    • @najroe
      @najroe 7 หลายเดือนก่อน

      @@RimstarOrg great, yes I know I was picking as bit, not meant any harm, just information

    • @RimstarOrg
      @RimstarOrg  7 หลายเดือนก่อน +1

      No worries. The more sharing, the better. Thanks!

  • @walgato1956
    @walgato1956 2 ปีที่แล้ว

    Excellent!!! Good job. Thanks.

  • @bassamali7738
    @bassamali7738 4 ปีที่แล้ว

    Thanks alot, your explanation is very clear.

  • @lucaswootten3064
    @lucaswootten3064 10 ปีที่แล้ว

    I was just curious. Whenever the current enters the diode, it looses voltage and the negative portion of the wave is stripped off. Then it goes back into the earpiece. What makes the crystal sense it then? What exactly does the diode cut off? Does it make the audio wave more positive by cutting off electrons so the earpiece only pickups the protons?

    • @RimstarOrg
      @RimstarOrg  10 ปีที่แล้ว

      Lucas Wootten Rather than type out a long answer, I'll refer you to my video on how a crystal radio works th-cam.com/video/0-PParSmwtE/w-d-xo.html. 2:02 has stuff about the diode and crystal. 8:55 starts talking about the radio and audio waves.

    • @lucaswootten3064
      @lucaswootten3064 10 ปีที่แล้ว

      I understand the majority of it, I actually did a presentation on it. But my professor wants every possible detail. But mostly how exactly the piezoelectric crystal picks up the waves after it exits the diode?

    • @RimstarOrg
      @RimstarOrg  10 ปีที่แล้ว

      Lucas Wootten Hmm... I don't know what more I could say besides what I explain starting around 2:02 into the video. Did you watch all of the video? There's even more about the waves starting at 6:54 that then leads into the stuff I pointed out at 8:55.

  • @renekenshin6573
    @renekenshin6573 11 ปีที่แล้ว

    Here's a tip, you can also use the mic from a telephone handset. The part that you use when speaking. Its also a piezo speaker

    • @RimstarOrg
      @RimstarOrg  11 ปีที่แล้ว

      Thanks for the tip. I've been hoping to run across an old discarded telephone handset but so far no luck. Maybe I'll find one at the yard sales in the summer.

    • @RimstarOrg
      @RimstarOrg  11 ปีที่แล้ว

      *****
      The small size of the speaker actually works against it by having a very low impedance (resistance to AC). Piezo crystal speakers like in the microwave oven actually have a high impedance. However, you can try adding a transformer in between the crystal radio and the small speaker. I show how in my "Use Earbuds/Earphones with Crystal Radio" video th-cam.com/video/GCh2LVHUavQ/w-d-xo.html

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    That would have been cheating. It's not homemade. But you're right, it didn't even cross my mind. I have that big a mental separation between homemade things and commercially manufactured things.

  • @justrosy2635
    @justrosy2635 6 ปีที่แล้ว

    Are there any safety issues involved in opening up an old microwave to strip for parts?

    • @RimstarOrg
      @RimstarOrg  6 ปีที่แล้ว +1

      Yes. There's a high voltage capacitor that should be discharged immediately after you open it. It's usually located near the back in the bottom.

    • @justrosy2635
      @justrosy2635 6 ปีที่แล้ว

      Like this one?
      sep.yimg.com/ay/yhst-82574741899364/microwave-high-voltage-capacitor-2100-vac-85-mfd-uf-13qbp21085-4.jpg

    • @RimstarOrg
      @RimstarOrg  6 ปีที่แล้ว

      Yup, that's the one.

    • @RimstarOrg
      @RimstarOrg  6 ปีที่แล้ว

      My needle nose pliers have thickly insulated handles so I usually stick one end on each capacitor terminal.

  • @mimoslavija
    @mimoslavija 4 ปีที่แล้ว

    Omg thanks i always put that in trashcan because I don't know what was that, but is very useful thing!

  • @cooper22592
    @cooper22592 10 ปีที่แล้ว

    Is this a piezo buzzer or piezo transducer? I'm trying to get one from radio shack. Thanks

    • @RimstarOrg
      @RimstarOrg  10 ปีที่แล้ว

      Cameron Cooper The answer is yes, it's both. A transducer is something that converts energy from one form to another. So a piezo crystal acts as a transducer when converting mechanical energy into electrical energy and when converting electrical energy into mechanical energy. A piezo buzzer does the latter, converting electrical energy into mechanical energy which produces sound waves in the air. But the one in this video isn't quite the same as the piezo buzzer you get from radio shack. The one from radio shack is like this but with the addition of some extra circuitry for converting DC electricity into something that pulses the piezo crystal.

    • @cooper22592
      @cooper22592 10 ปีที่แล้ว

      Ok thank you! Also I'm not sure what my inductance should be for my coil. I'm using a short piece of bamboo with a diameter of 2.75. The wire I decided to use Is thermostat wire which I believe is 18 gauge. Now rather than wrapping it and then sanding the insulation off I made 7 individual taps by raising that piece of wire and stripping the insulation and twisting it that way my alligator clip can clip onto that wire.. What is your opinion on my construction/calculations... My calculated inductance is 148.5uH

    • @RimstarOrg
      @RimstarOrg  10 ปีที่แล้ว

      Cameron Cooper I'm assuming that's 2.75 centimeters. 2.75 inches would be a pretty thick piece of bamboo. To calculate inductance I'd also need to know how many turns you have on your coil and how long the coil is. My coil tops out at 369uH.

    • @cooper22592
      @cooper22592 10 ปีที่แล้ว

      RimstarOrg Yes it is 2.75 inches in diameter. Length of coil in inches is 3.5 and number of turns is 61 with a tap every 7 turns giving me 7 taps total.

    • @RimstarOrg
      @RimstarOrg  10 ปีที่แล้ว

      Cameron Cooper Cameron Cooper At full length I calculate an inductance of 789uH. If your variable capacitor is the same as mine
      with a top capacitance of around 600pF then you should be able to tune
      up to 1.7MHz, so that includes the full range a normal AM radio can tune
      into. That's using only the formula for parallel coil and capacitor resonance (LC tank circuit.) The inductance formula I'm using isL = (permeability x number of turns x number of turns x area) / lengthwhere the permeability of air or bamboo is around 1. This is using the metric system, so the dimensions use meters.

  • @okhamradio
    @okhamradio 4 ปีที่แล้ว

    Thanks for sharing!👍

  • @CAPTAINSSBN
    @CAPTAINSSBN 10 ปีที่แล้ว

    try putting the sound hole against a sea shell for amplification like a Bodes System

    • @RimstarOrg
      @RimstarOrg  10 ปีที่แล้ว

      ***** I think you meant bose, the speaker makers?

  • @Maccreeperslayer
    @Maccreeperslayer 9 ปีที่แล้ว +1

    I believe you can find these types of speakers on old motherboards sometimes

  • @Unbekannter_Mann
    @Unbekannter_Mann ปีที่แล้ว

    I got a question can any piezoelectric works

    • @RimstarOrg
      @RimstarOrg  ปีที่แล้ว

      I suspect not. There isn't a lot of power coming from the crystal radio and so it has to be one that can give good vibrations for the sound waves while still being given lower power.

  • @dorian8475
    @dorian8475 9 ปีที่แล้ว

    Hi! Can you show me how to do galena detector?

    • @mnpd3
      @mnpd3 9 ปีที่แล้ว

      +Dorian Bondoc
      First, all galena is not equal. Some of the stuff is outstanding as a detector while some of it will barely detect anything. You'll need to either buy one that is tested and working, or get a lot of galena and break it up looking for the good pieces. All you'll need to do is make a "cat whisker" on a rocker arm of some sort. Use the thinnest gauge phospher/bronze wire you can find, and "tickle" the galena crystal with the lightest pressure possible. Keep tickling until you find a loud setting. NOTE: Heavy pressure - or pressure of any amount at the wire/galena contact means you won't hear anything. In a pinch I have used an open safety pin with the phospher/bronze wire gently touching the galena.

  • @VictorVii
    @VictorVii 12 ปีที่แล้ว

    Good video as always.

  • @fidelcatsro6948
    @fidelcatsro6948 4 ปีที่แล้ว

    This helped me in 2020!!!

  • @bacahturzh4551
    @bacahturzh4551 5 ปีที่แล้ว

    Can i use the ringer of a oven toaster

    • @RimstarOrg
      @RimstarOrg  5 ปีที่แล้ว

      I haven't opened on up for I can't say for sure. The ones I've heard were all quick "ding!" sounds which I suspect is a bell mechanism of some sort and not a piezoelectric component.

  • @RimstarOrg
    @RimstarOrg  12 ปีที่แล้ว

    Thanks.

  • @ysvsny7
    @ysvsny7 ปีที่แล้ว

    great video!thank you!

  • @RealationGames
    @RealationGames 12 ปีที่แล้ว

    Back in the days people did this a lot, but nowadays most hobbyists, including me, just order ready imtes on Ebay for 0.12$ or something. I liked it this old way though, of harvesting electronics.
    I'd figure it would be piece of cake to use some opamps to amplify it to speaker level...

  • @soonersciencenerd383
    @soonersciencenerd383 9 ปีที่แล้ว

    the plastic ink pen tube can be used for a coil form for a crystal radio. ive used a small, ink pen tube(that holds the ink), cleaned it, made holes, and wound 90-100 turns of wire, and I can get SW signals.another ink pen tube (like yours), I did the same, and can get AM signals, sometimes SW (on a clear nite).good video! I have several piezo speakers, and will try them!

    • @mnpd3
      @mnpd3 9 ปีที่แล้ว

      +Sooner Science Nerd
      I've always found that the larger the coil form; the more sensitivity and selectivity is had. Smaller coils work, but tend to be excessively long and if tuned with a strap slide a very long range of movement is necessary. It's why most small coils use a powdered iron/ferrite core which may or may not be adjustable for tuning depending on the range of the variable capacitor --- if one is even used. The coil itself can handle the tuning job if made adjustable, even if selectivity and sensitivity is reduced.

    • @soonersciencenerd383
      @soonersciencenerd383 9 ปีที่แล้ว

      +mnpd3 I get the best reception from a small pill bottle with 100 turns on it. I can get 2 local stations, CBSsports,ESPNRadio, and WorldHarvestRadio. not bad at all.I connected a piezo speaker to my amp, and it acted like a microphone!I got the piezo speaker from a scrapped boom box. (from my radio and tv scrapping, I have 50+ speakers, all sizes, and they work fine!)

  • @jomona9783
    @jomona9783 7 ปีที่แล้ว

    Sir. How to make a crystal radio earphone without a piezoelectric buzzer. Using magnets and copper wire

    • @RimstarOrg
      @RimstarOrg  7 ปีที่แล้ว

      I've always wanted to make one of those but I haven't yet. I don't know if I'll ever get time to.

  • @punsher6411
    @punsher6411 3 ปีที่แล้ว

    can i use the the buzzer for crystal earpiece

    • @RimstarOrg
      @RimstarOrg  3 ปีที่แล้ว

      Sorry for the delayed response. Yes, you can use a buzzer. I demonstrate it in my Crystal Radio Troubleshooting and Tips video here th-cam.com/video/HZZmKZJrIW0/w-d-xo.html at around one minute and thirty seconds in.

  • @UniversalHuman7
    @UniversalHuman7 4 หลายเดือนก่อน

    Awesome video

  • @PaulusdeKenezy
    @PaulusdeKenezy 8 ปีที่แล้ว +1

    What about the high voltage danger?

    • @RimstarOrg
      @RimstarOrg  8 ปีที่แล้ว +2

      Do you mean the high voltage danger due to the capacitor? I guess I can add an annotation or something to the video description. Good point. There is a bleed resistor and I've never found one to be charged when I've opened them but I know that because I always to try to discharged it anyway.

  • @soonersciencenerd383
    @soonersciencenerd383 9 ปีที่แล้ว

    i almost forgot- i wound the tiny wire from a twist-tie, onto a large, leather needle, connected that coil to my crystal radio setup, and got FM stations! 1-2, but, FM radio!try it!

  • @gameyord7182
    @gameyord7182 2 ปีที่แล้ว

    I would use a rc choke before the diode

  • @Oinikis
    @Oinikis 12 ปีที่แล้ว

    oh, i got a microwave and it dings (ding is produced by bell or something) when it's cooked, also, it has no buttons, you have to spin the timer. soo my microwave is probably old designed.

  • @robertnagy2491
    @robertnagy2491 ปีที่แล้ว

    Not use paralel resistor?

    • @RimstarOrg
      @RimstarOrg  ปีที่แล้ว +1

      I didn't but you certainly can. It sometimes helps.

  • @ver64
    @ver64 12 ปีที่แล้ว

    Awesome idea.......thanks

  • @kq6up
    @kq6up 9 ปีที่แล้ว

    What about a piezo speaker from singing greeting cards?

    • @RimstarOrg
      @RimstarOrg  9 ปีที่แล้ว

      Chris Maness That'll probably work just as well. They're harder to find these days but I did make use of one in the opposite way for my rain powered LED here th-cam.com/video/laSQ6yd7jaE/w-d-xo.html

    • @mnpd3
      @mnpd3 9 ปีที่แล้ว

      +Chris Maness
      All piezo elements will work, but the smaller ones suffer from reduced volume. With piezos pressed into service as sound producers, bigger is better. I've experimented with these for years and have never seen a case where the larger elements don't give louder volume over smaller ones. There are some really large piezos out there. Another source for an even bigger piezo "speaker" is an old smoke alarm. These things have to be loud and the ones I've take apart always had a large pieze inside. The best piezo I've found is the Mallory part number FT-417 which can have several different letters/numbers after the "7". I've seen a "W"; also "5WQ." Other than different colors they all seem to work the same.

  • @donniewatson9120
    @donniewatson9120 9 หลายเดือนก่อน

    I found out that one can use a flame as the detector for a crystal radio.

  • @cheesebuds8962
    @cheesebuds8962 8 ปีที่แล้ว

    That's wonderful!

  • @Kevin192291
    @Kevin192291 12 ปีที่แล้ว

    That is awesome, great idea :)

  • @luisadrianomeusparabens6863
    @luisadrianomeusparabens6863 4 ปีที่แล้ว +1

    Muito top parabéns

  • @marieomagpie
    @marieomagpie 12 ปีที่แล้ว

    I can't believe you didn't go an extra step and show them how to power two earphones with just another diode. they work on negative voltage too.

  • @kilbonrobert
    @kilbonrobert 12 ปีที่แล้ว

    Great work :)

  • @tf.samrudhh
    @tf.samrudhh 2 ปีที่แล้ว

    can we use a normal earphone?

    • @RimstarOrg
      @RimstarOrg  2 ปีที่แล้ว

      It's harder to get it working and won't sound as loud but you can use an earbud if you add a transformer. I show how in this video th-cam.com/video/GCh2LVHUavQ/w-d-xo.html

    • @tf.samrudhh
      @tf.samrudhh 2 ปีที่แล้ว

      @@RimstarOrg thanks soo much i luv ur videos they are very informative

    • @tf.samrudhh
      @tf.samrudhh 2 ปีที่แล้ว

      @@RimstarOrg but the prob is i dont have a transformer :(

    • @RimstarOrg
      @RimstarOrg  2 ปีที่แล้ว

      Most of mine come from things I took apart.

    • @tf.samrudhh
      @tf.samrudhh 2 ปีที่แล้ว

      @@RimstarOrg i am 12 years old but i have completed 11th grade electric and electronics since i am twelve i dont hav anything of my OWN but i can buy a transformer from my allowence

  • @RimstarOrg
    @RimstarOrg  11 ปีที่แล้ว

    Ha Ha! I'm not surprised your mom won't let you do that! :) Often people throw them out and I take them when I see them. You can also use piezo buzzers available at electronics stores. You can buy crystal earpieces online (I put some links in the description below this video.) You can use earbuds, like iPod earbuds for example, by adding a transformer. It's harder to do. You can see how in my "Use Earbuds/Earphones with Crystal Radio" which you can find on my channel page.