Let's make a function generator(1)
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- เผยแพร่เมื่อ 4 เม.ย. 2018
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Let's make a function generator(1)
In this video we start making a DIY function generator based on the 555 timer IC.
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FAQ:
Me: Paul, 49 from USA
Education: United States Navy, University of California at San Diego B.S. E.E., University of Pittsburgh M.S. E.E.
Experience: United States Navy STS, Bayer Intnl Process Engineer
Current: Teaching college freshmen electrical engineering at a small community college in the Pittsburgh Area.
Health: BAD (Congestive Heart Failure)
Hobbies: Electronics, flying, amateur radio, music (classic rock) - วิทยาศาสตร์และเทคโนโลยี
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Its always good to go back to basics. As my partner alway tells me. "You always assume that every one you talk to knows as much as you". Hmm! If I have faults this is one of them. Even so, watching a time served guy who built and repaired electronics in service of his country, using down to earth language, clear concise build instructions, without highly technical terms being used gets a thumbs up from me every time. Really like to see more videos like this. Thank you for your time in producing such great informative videos.
Thank you my friend.
You have so many videos, I feel like I am always discovering a new one when looking back in the timeline. Got to love that 555! Thanks Paul!
Thank you - I have been trying for 3 weeks to get a 555 to work. Rubbish I know, but bad sense of direction, I turn them over, I lost which pin is which. Because you inserted very components before testing it worked. I am so happy. :)
Thanks, Paul! You're a great teacher! I found this easy enough to give it a try, even though I already have a little 2MHz SainSmart Signal Generator.
Enjoying this already, very cool.
That is a clever by it's simplicity! A circuit to demonstrate an important fundamental of electronics with the great little 555 (so versatile, 5-15V.). So quick and easy to implement, damn good tutorial, Thanks Paul.
best tutorial I've seen on how to build a simple freq generator. Sure there are tons of them out there but yours makes it easier to understand the basic fundamentals on what the parts do and why. By starting at the most basic setup with just duty cycle adjustment, the viewers hopefully will see what they need to expand to adjusting frequency. I believe teaching people the basics the way you did is so much better for understanding what we are really doing. Very nice approach indeed!
Thank you so much this is exactly what I've been looking for
I'd like your explanation, it's so simple but complete... Hugs from Vinícius Brazil
God bless you sir and thanks for the amazing effort 🙏🏻 keep going ❤️
Thanks! I learn a lot from these kind of videos.
Welcome!
I build a piano out of this. Thanks for this tutorial. It helped.
This going to be a really good series. The function generator I bought never did work. Maybe this one will? Thanks, Paul gonna be a goodun!
Cool, play along and you will have a basic function gen.
... first time for me seeing an variable capacitor used in a 555-based signal generator!
all other schematics use a potentiometer, for fine tuning, and a bunch of switchable caps...
looks like i have something for play today... thanks! :D
Very good!! I guess I'm going to have to stock up on some parts so I can follow along!!!
hi,mister paul
I need help electronically,please!!?
buen vídeo. saludos desde Uruguay.
Gracias amigo
Great Video
When you first adjusted the duty cycle, you were actually changing the frequency. The "on" time remained the same but the "off" time lengthened. That's changing the wavelength which also happens to adjust the duty cycle, the way you have it hooked up. The scope even shows the frequency changing in the lower right.
Thanks!
Very interesting, looking forward to the upcoming videos :)
Wie groß ist Frequenz ?
This’s very interesting
Awesome video!!! I need a 555 primer now
Look through my basic electricity and electronics playlist. I think I've done 4 videos on the 555 it's my favorite ice.
Thanks Paul! I just picked up some components tonight following your video here. Learned a lot by just fooling around with the basic setup. The 100pf varicaps I purchased were a bit small so I will just see what the old desktop radio has to offer. In the meantime I have some usable caps.
Great series!
This is an awesome idea, I'm on board!!
Cool
Bread board?
Ty
thank you man..
Welcome
It Helps me a lot in my project, Thanks For that. I just want to know the value of all materials that you use in this vid. Thank You for your response
👍👍
Quite informative. Any tips on how to modify the offset in order to achieve a positive one above 0.25 volts? Thanks a lot
Another great little project Paul, thank you for your time and efforts in educating us wot need it for our new hobbies... 👍🏻.
My 555s arrived today - guess what I am doing this evening... 🤪 🐍
Part 3 is going live at 5pm EST today
what is the range of the variable capacitor you are using?
Great video, but a small note: I think saying 'variable potentiometer' is a bit redundant, since a potentiometer is inherently a variable resistor.
I found this video very informative thank you for the Informative video, i have a doubt. the positive probe of DSO is connected to pin no 3 i.e output of 555 IC But where to connect negative probe of oscilloscope ? In Ground ?
With the pot d.c and fre. both are changing buddy.
Hi, First time view to your channel. Very interesting video, just a question, why do you connect the scope ground to the circuit first then the probe..... thank you kindly, have a nice weekend...
Whats Is The Value of Variable Potentiometer did you use in your DIY Frequency Generator
Can you tune the frequency if befor or after the cap you have pot? That way the cap will charge and discharge slower or faster?
Wud b great if u cud add the Varicap lead/pin connections
Pick two, as long as one is the middle
Can you share the components list to make this circuit
Can this work for boost or buck converter?
Ever considered using an XR2206 chip? They're a bit better than the 555's, though not as ubiquitous and historical (and cheap).
I'm waiting on a 2206 in the mail to play around with. Can I use it to get some sounds out of? Like connect the output to a speaker instead of an oscilloscope?
What makes the best sig gen in your opinion? ICL 8038, XR 2206 or the AD9833 or even the the old 741 op amp? they have their advantages and disadvantages. just wondering.
I have connected my 555 timer as a clock input to jk flip flop (74hc109).
I am getting the waveform similar to what you have shown in video( 5:53 ) will that voltage spikes affect my clock input to flip flop??
could you please comment on why the square wave got slightly deformed when you added the trimmer cap? It looks more like a chainsaw /square wave. How can you make the peak to peak voltage more stable?
interesting. But.......what is a function generator, how is it used? thanks
what if we wanted to change the capacity using a potentiometer in series with the capacitor, is it possible?
@learnelectronics - Paul, what is the range of the variable capacitor you are using and where am I likely to pick one up? Amazon seems to chuck up micro versions in pico farad measures? Just caught Pt3 awesomeness too... 👍🏻 🐍
how can we make a sine wave?
Hi, are you planning any more live streams ? Enjoyed the last one.
Yes I am. Any ideas for what you would like to see?
Having watched since 1K subs days, I enjoyed hearing about your electronics background, interest in radio, family stuff, etc.
You could discuss the practical use of this kind of radio in this day and age / explain the attraction of this interest (i've no experience of it). Have you tried SDR - software defined radio ? I'm tempted.
I also like your usual videos like this one showing practical use of different electronics components.
Any experience with Digital Potentiometers such as the MCP41010 ? Any interest / experience with FPGAs?
I'm working A LOT with the M5Stack (ESP32)- so I would be interested to hear your take on that. Its versatility now and with coming modules & some recent software development by users is quite remarkable. You can check some on Twitter. Happy to provide any info, but perhaps via Twitter PM - don't want you to feel I am advertising in your house !
what if we need the frequency up to 100khz?
I prefer "triple 5 timer" iso "five, five, five timer".
Whats the name of that capacitor?
7.83hz
You connected the positive terminal of PSU to the yellow jumper and negative to the negative terminal and if it is ground where is the negative terminal of the PSU connected...plz help ....I am a noob in electronics
Atari Punk Console mayhaps?
thanks
I'm having a hard time finding a variable capacitor. My usual electronics sites don't seem to carry this item. Anybody have a suggestion?
amzn.to/3AsyYbK
Any reasons my square wave looks like crap?
Signal integrity
@@learnelectronics thanks but any insight on how I can improve it. I'm just an HVAC technician but with the way the industry is going your going to have to be an electrical engineer to work on new equipment. I have a variable air capacitor that is about 0-330pF.
Why always connect the ground first? I don't see it making a difference *here*.
Potential. Say two circuits have a potential of 5V. Circuit A's range is 1-6v. Circuit B's is 100-105. Electrically they are the same potential. By connecting the grounds first (referencing ground) both circuits now share the same reference. So in effect they are both 0-5v. If you don't reference ground you could effectively be putting 105v into a 5v circuit.
You are describing situations where multiple energy sources are to be connected. I understand your argument there. Here you have just one voltage source (a battery or bench power supply perhaps) and your breadboard. The breadboard gets its potential from the first lead you attach. Since the breadboard clearly has no other connection yet to any other potential there cannot be any voltage in the circuit from attaching just one lead, no matter which one it is.
Paul is an educator. within each field of education are a series of best practices. these are habits one should develop so that the approach to problem solving is most likely to be successful and have fewer accidents. for someone like yourself , whom obviously already knows everything, about all that can be said to you is, do whatever the hell you want, teach your kids to be morons, oh, i mean, just like you. you are about as far from the truth as one can get , i have no idea why the dumbass who sent you called himself the truth. probably one reason why you can not even use your real name in your communications.
@Douglas Kryder "TheTruth" is a character from a video game. "TheTruth sent me" is a dialog line from a cutscene within that. I just liked the ring of it. You've obviously read to much in to that and used it to fuel your anger towards me. Regarding that: I didn't criticize any best practices. I merely advocated deeper understanding. I guess this bothers you. Sorry.
Let's just all enjoy the site without any backbiting or name calling! You had a valid question which Paul answered so everyone should be happy. This is a great channel so let's all be friends! ;-)
A potentiometer is, by its nature, variable. It is a variable resistor. To call it a variable potentiometer is redundant.
Also, the larger your pot between 6,7,8 the longer your period will be.
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@jumbo999614
What is value the variable capacitor and potentiometer that you use in this video?
Do you have link to buy variable capacitor?
I just built my first diy Arduino oscilloscope and I need to test it.