Low V Regen Part4
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- เผยแพร่เมื่อ 21 ต.ค. 2024
- How sensitive is the Low Voltage Regenerative Receiver to tube type or weak tubes within a type? I will dig out some classic miniature tubes to try like the 6C4. WE need to investigate 12V operation. Then I go nuts and convert the first stage to a pentode and add input coupling control. What would happen if we yanked the tubes and stuck in a pair of JFETS?
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Been building tube regens for years but I always learn something new from your videos. I may just have to build another one while I'm still stuck indoors.
Building radios while my XYL strips walls, paints, changes blinds and does other upgrades is perfect during the long indoor lockdown, but there is a problem. She's running out of house.
You do some very interresting videos. Thank you.
Thanks for watching!
absolutely fantastic series . Thank you for taking the time in doing this presentation.
I really enjoyed this series and learnt a lot. It's nice to know that I can cut my teeth on valves (sorry tubes!} at low voltages. Thanks for your time and work on this series.
Fleming Valves detect emissions from the Ether or is it the Heaviside layer?
im old tube guy too ham over 40 years great videos bring me back in time , thanks for videos i think im going get building again home brew station old style
I seen a radio like what you have on the back table. it was in a antique store just a few days ago. 1924 or 25 I don't remember? I have never worked with tubes so, it is still sitting there. :-)
Axcellent presentation thank you.You remind me with the old receiving systems
Thanks for watching!
Hi mike. Nice video. 50 years ago i build my first regen rx with a venerable 6j5 and i be able to rx bc stations 150 miles away. I always haved the same ideo like Dayle Edwardsand see how it perform a pentode regen using the screen for the throtle and volt control. I built several fet, bipolar and tunnel diode regen receiver. For now i am experimenting in vlf band to detect thunderstorms with a good succes using hartler regen receiver. tks for ur time to explain carefully. 73 XE2EJ Fernando
My first SUPER REGEN was a 6J5! The darn thing picked up FM stations 50 miles away.
Great series Mike. Thanks.
pretty darn good for tube or 2 if you ask me, simplicity and excellent results.
Well done alright and enjoyed very much ,great to see the variations with the different tubes ,learnt alot ,thank you for sharing with us.
Glad you enjoyed it. My tube junkbox presents some very tired specimens that bring real world construction issues into the fun.
Great videos. Greetings from Mexico.
Vielen Dank, Frau Olbermann, für das Ansehen meiner Radiovideos! Thanks for watching!
Thanks a lot for your time and Job. Congratulations
Thanks for sharing your project
Wonderful project, thanks !
Awesome series, thank you!
To majstore. Bravo pozdrav Yu milan i cooking recepti.zaista nešto fino.
Nice project!, congratulations
20:14 I tried to reproduce the "Radiola Senior" using a JFET, but I used a variocoupler arrangement to control REGENERATION - - was I wrong?
MPF-102's I think damage easily with to much Vdd applied to the source to drain supplied by two 9V Xsistor batteries connected in series with a 1K Ohm resistor? ? ?
Using a variocoupler as a regen control is very elegant, some say better than a throttle capacitor. I used a variocoupler in this project as the antenna coupling control.
Thank you for the video, very interesting and informative. In my practice, I paid little attention to regenerative receivers. After your videos, I wanted to experiment with them and especially with low-voltage power. I'm from Russia and I write using a translator on my computer, so I'm sorry if something is not very correct.
Ваш переводчик отличный! Спасибо за просмотр!
I've got a couple little 6V filament pentodes -- 6AV6 or 6AT6, if I'm remembering right, sockets, tuning capacitor, and a couple 3:1 verniers. Must get some chokes, and some higher wattage resistors, plus some enameled wire to wind the coils -- I've got to finally build one of these things. I'll probably make a multi-tap main coil so I can run up into shortwave. The beauty of a regen is you can use it to listen to CW and SSB with no changes in the circuit -- just a twist of the regen control.
I hope that the project is in full swing by now!
@@MIKROWAVE1 No, I have too much on my plate -- still getting my darkroom up and running and trying to organize stuff so I have space to work on radio. What I really want is to build a one-tube CW transceiver -- a regen that transmits by raising the coupling into full oscillation. Strictly QRP -- a couple watts -- with one tube, but it ought to be possible, perhaps even engineer in a offset so I can hear folks who zero-beat my signal. Still trying to figure out how to get a side tone, though.
Excellent, thanks for share
Thank you! Cheers!
Love your work and lets get more out for a hog like me! Carl
I'm gonna slop the hogs! Thanks Carl.
Well done. Do all the 6-volt tubes have the same filament resistance? They seem to divide the 12-volt supply very handily. I doubt that's not just luck on your part.
The common-base antenna buffer threw me for a loop momentarily. I had forgotten it is a good impedance-transforming buffer
Yes! most in the same class have the same filament current rating and thus divide the voltage nicely. 150 mA for the 12V tubes and 300 mA for the 6V tubes.
I enjoyed your series and will build this. A question about the tickler and removing turns. Could you have used a variocoupler for the tickler to avoid taking off turns?
Variocoupling the feedback? That is how almost all 1920 AM Band Regens did it. The throttle capacitor and more primitive (but simpler and cheaper) resistive swamping and voltage adjustment comes later.
Great!!! Many thanks!!! This answers my questions.
We want to hear about your radio construction progress!
MIKROWAVE1 I'm stuck with the JFets having very poor regeneration control. Can you post a link to the JFET receivers diagrams you showed briefly on the video please?
@@NOMOREPAM Yes I will post those. Nowadays, after Chuck Kitchin got his circuit tamed in the mid-1990s, most folks now bring the detected audio off the source as a follower. That separates the audio from the feedback control, so the throttle approach and even voltage control, start to work more effectively.
Hello. On the coupling coil subject. Schematic is showing 5-10 turns. Is the coil recommended to be close wound or scattered out like in the video. Kinda looking for some more information on this coil design ideas as windings count examples for the shortwave bands as well.
All the normal rules apply like using standard close wound solenoid windings at low frequencies, and spreading turns and using heavier wire above 10 MHz or so. But because we are dealing with low voltage, generally more feedback is required, so the tickler windings or in the case of a Hartley, more tap feedback is required to get it into the sweet spot.
If the justification for low voltage B supply is because of relatively hard to find 45 or 67 volt batteries, there's an easy solution. Dollar tree has rectangular 9 volt batteries either 1 or 2 in a package. They're not alkaline but at low drain it probably won't matter much. Anyway, 9 volt batteries can be nicely snapped together to get higher voltages. 2 get you 18 volts for example. A 45 volt source takes 5 of them, and 7 produces 63 volts. You can use 8 for 72 volts if you want. It's almost as if they were designed to do it. With a standardized connector of some sort the B battery can be moved from radio to radio. I've made many of these assemblies and they work great. Large shrink tubing made for battery packs make it extra nice. Packing tape or duct tape work as well.
Another possibility is 2032 3 volt lithium coin cells. A C cell holder will accommodate 15 or 16 2032s stacked in series for either 45 or 48 volt output. I have located good prices for them as well. $.30 each is about as low as they sell for, so a 16 cell pack will cost roughly $4 which is in the neighborhood of the 9 volt based version. The 2032 pack is nice and small, while the 9 volt pack has a higher mah rating.
Btw, the only power switch truly needed is for filaments on these receivers. Without a heated cathode no plate current will flow, meaning the plate voltage can stay connected if you want.
To a young person or beginner, or even someone with limited resources, reading a vintage hobby book or article, it is sometimes is as simple as the project specifically calling out unobtainable parts. Parts that can easily be substituted by low cost common items. To others it is a justifiable fear of electrocution!
Dollartree sells very cheap 9V Transistor batteries?
@@MIKROWAVE1 45 volts is considered safe.
@@Jeffrey314159 Yes.
I have tried sharp 6sj7 and remote 6sk7 regenerative detector tubes. the advise was the remote cut off would give less critical regeneration adjustment. ya, but, not by much that I could tell.
Same here - lots of hype but no real diffo...
Excelente trabalho, parabéns professor.
Where do you get these nice cardboard tubes?
Dunno - I see then show up in the mail and save them. Mostly mailing tubes.
awesome, really enjoyable to watch, The tickler coupled to the screen works very well with pentodes, the variable DC voltage fed into the earthy end of the tickler.,, the tickler in series with the regen pot and screen grid This connection further isolates the anode, effectively becoming an electron coupled oscillator. This will make the RFC redundant . You may like to try this ?
Wow! You are going to enjoy the next video in the works "Regen Nuts". Before I leave the subject, at least for a while, there has to be some humor added in to all of this. The The high point is a no holds barred shootout on 75/80M between a 1929 vintage Regen and a Collins R390A.
How about using a 6au6 as the detector? Grid #1 to 12v, Grid#2 as the control grid, Grid#3 to the plate. This is a space charge triode circuit.
An Avante Gard circuit to be sure! Hey I had a very microphonic 6AU6 that I wanted to show in the video. I forgot to do that.
Great afternoon of videos...Signal Path repair of a R&S I-Q modulator box and MIKROWAVE regen receivers at the other end of technology! ;-)
TH-cam is one therapy that does help to keep us sane during our long covid trial.
Que alucinante estas cosas!
Hello Mike, I greatly enjoy all of your videos and I always learn something new... you never fail to deliver...!
So as a follow-on to this video, how about doing a Plate-detector version...?
(BTW Mike, on a separate note, I am curious if you know why some Balun designs use teflon tubing around the conductors? Does it have anything to do with maintaining a consistent dimension between the conductors? Perhaps you can speak to it in a future video...? )
Thank You Again...!
Best regards,
Greg
(KC9ZEW) ...
Wow Greg, I have no idea what the Plate Detector version of a Regen is. But that is normally how I start - knowing nothing...Ha. The tubing idea? My guesses include: handle core and conductor heating and as additional protection from HV arcing, and even abrasion from sharp edges of some ferrites.
@@MIKROWAVE1 Hello Mike, so I just read the teflon tubing is to increase the breakdown voltage and the other reasons you give are also quite reasonable...
And yes, I was curious how a plate detector may perfor compared to the grid leak detector... best regards...!
www.r-type.org/addtext/add031.htm
en.m.wikipedia.org/wiki/Plate_detector_(radio)
I am using a 6am6-ef91 with Russian 6ba6-6k4p audio seems to work well.
1:20 Old fashioned headphones are very sensitive if you have the impedance matched right
NICE!
What does "Ugadane" mean?
Thanks for series which I really enjoyed. A tube regen is definitely on the to do list for me. Rather than having beaten the subject to death, I feel some sense of loss and a slight yearning to learn more of the adventures of this tube regen. Shall it be unceremoniously stripped of parts for a future project? Left in a cupboard and neglected? Go on to live a full and useful life?
I try to be civil about it, Steve. It's unfair to just recycle these things. Instead I tend to keep looking for enough junk to keep building, without having to scavenge, and perhaps if I am stuck, and do have to grab a part, I replace it afterwards and put the item back in the Magic Closet I keep - where past projects live.
Hey Mike. I just completed the 12v version of the Low Voltage Regenerative Receiver. It sounds pretty nice on the broadcast band. I haven't wound any other coils yet. Mines built on an aluminum chassis. I'd like to pair it with the amp I made a few months ago...your design but I need to find transformers. Tnx OM - wa4chq
Try some small 24V jobs. Some of these have a tiny Hi-Z wind on the primary and transform the impedance down for 600 Ohm headphones pretty well.
OK...thanks!@@MIKROWAVE1
good set of videos for sure. yep here it is.. But... lol .... so many vids on builds.. not many or at least i dont find them.. on trouble shooting .. signal trace. so on ..
hello mr. mikrowave, i built the low voltage regen receiver but im not getting any sound coming out. can anyone help me? I really need some help to make this thing work.
Start by removing the tube and measuring the plate pin to see if the B+ is there. Is the tube lighting up?
Can you help me building a low power pentode Fm receiver radio 88 to 108 mhz receiver . I Need your help.
FM can be slope detected by a superregen. That can be done with a single tube like a 6U8 with the triode stage as an RF buffer and the pentode stage as the detector driving headphones. Or two valves like adding a 6AQ5, if you want speaker volume. The other approach is a Fremodyne which is the same thing but with a front end tunable converter into a another double tube with one side being the superregen operating at the IF, and the pentode driving the speaker. A pair of any of these valves and 60-100 VDC and I think you would have something: 6U8/6GH8/6EA8/6JW8/ECF802/6LX8/CV5065/ECF82/6F1P. I will post something on Mikrowave1.facebook.com
I noticed you used a variometer.
Just a teaser at the beginning and end. I am a sucker for link coupling on these regens. That was why I built the coil upside down and made it tall. Not tall enough actually so I had to make a little platform out of cardboard.
I plan to use some 6 watt dynamos for building a regulated battery charger to take on my bike for long trips,? I’ll stay powered up on the road with this technology, I came up with a efficient design that can light up incandescent bulb off this amount of power DC to DC converter and it makes a bunch of RF noise, I wonder if the FCC would trace me down?
I would add about 20 ferrite beads, a 12 x 12 x 5 " lead box, two 1 Farad Capacitors for a start.
Use a hub mounted dynamo, don't go for the ones that press onto your wheel. They put out maybe 3 watts, but add so much friction and loss that it slows you down significantly.
You probably don't need any dc/dc converters, bicycle stuff is usually available with AC output. Otherwise you can use something that switches at 50hz, so you won't be having any RFI. It does make the transformer a bit bigger.
LimaVictor nah I’m sayin I got em goin good nice electricity mah dawg. 6W $9.99 each on amazon, I bought the last two Tung-Lin bottle dynamo now I’m square. Right after I did that the price went way back up to $32 cuz I’m a boss and spend time lookin for the sales. I work at an amizon warehouse so I help get it onto my porch like that cuz I’m the man
If you keep cycling and cycle fast, the FCC may have a hard time finding you.
What is "ugadane"?
Ha its TUNING in Croatian!
Hi Mike, I've really enjoyed this series of videos, and I'm determined to have a go! Many thanks and best wishes Alan G0NFY
Let's hear some squeeelin!
KA2213 AUDIO IC will give better audio Quailty, instead of LM386.
Yes sir. The old LM386 is a first Gen device that is simple and cheap. There were many nicer parts developed once the tape decks and boom boxes came out, and you could hear distortion clearly.
I measured the inductor on the Boonton Rx Bridge and put the results on the Radio Resource Page. facebook.com/Mikrowave1
Still waiting.
lots of lies on the media.
Preserved for your enjoyment on the videos!
I got the circuit from Collins design.The web site called simple radio circuits Collins.