Let's make a function generator(2)
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Let's make a function generator(2)
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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)
Thanks! Another great video. I am a mechanical engineer (retired) so I am finally able to spend time learning electronics, something that has fascinated me my whole life.
Thank you. And thank you for your support. I've done electronics my whole life. Sometimes even willingly. I enjoy sharing.
Thanks Paul. Your videos give me confidence that I can build this.
Great videos! You have a good pace to your explanations that makes it easy to digest. Would be great to see a side video about the math. New subscription for me.
Thank you. I will cover the math. I just don't like my videos going too long.
amazing , I never thought it would be that simple
Great video. Thanks for sharing.
The resistor in series with the capacitor looks like some type of simple band pass circuit.....
An RC circuit. Fun stuff ! I am looking at the datasheet and following along as you build. I am going to have to try that and see if I get a triangle wave. I just finished a Communications class last semester and maybe I can figure out the math.
This is a low pass filter. The amplitude is decreasing at higher frequencies.
it sure would help if you would PUT IN the SCHEMATIC....u say PROFESSIONAL ....NO SCHEMATIC ...NO
Hi, I was just fiddling trying to build this circuit because I bought one of those cheap JYE tech dso 150's. Upon building I notice that in the drawing the signal goes through resistor first then a cap to ground and the signal taken at the resistor/cap point. When I try that I dont get anything but if I put the cap to ground before signal goes through resistor I get a triangular shape? It looks like you do that when building circuit to but in previous integrator explanation it shows after resistor cap goes to ground. By the way my dad is a Ham also W8CCY....Michigan. He got me interested in electronics as a kid with those radio shack kits. Only until now I'm starting to understand what's really going on a bit more. Thanks for making these videos.
Cool. It's a simple RC circuit. However, can you give a few examples where changing the freq would be beneficial? For LED dimming, adj the duty cyc is far more important. Same with motor speed control. Changing the freq would change the "smoothness" of the motor but not the actual speed, ya?
For a function generator, you want to be able to adjust frequency, duty cycle, and the shape of a wave.
You change or sweep frequencies to see how your circuit reacts at different frequencies. If you are dealing with audio you may want a sine wave or even a triangle wave to change the timber of the sound.
LPF...I have been an EE the same amount of time as you!! I have, several times, mathematically derived the 555's Freq, pulse width, duty cycle....and YES the duty cycle ONLY depends on the resistors...makes for some interesting uses for the capacitor, especially if it is CONTINUOUSLY adjustable. HENCE the following question:
WHERE did you get that adjustable breadboard cap???? What is it's range...NEVER had one!!
Top drawer! Spot on! You are wonderful at explaining stuff, and in general. Integrator?--I sort of remember that. You are fun. You are rekindling childhood and that messing about in labs for me:) Thanks. From a 50 year EE to a young 30 year one....
I'm new to electronics, sort of. In the second video on building a function generator you drew the integrator circuit before applying it to your circuit. Did you adjust the triangle wave with the potentiometer in the integrator circuit?
I am aware that the RC circuit is way less complicated than using an OpAmp, but I was curious if the OpAmp Integrator would have given a sharper or more symmetric triangle wave?
Good observation, we will get that, coming in the video or two in the series.
A 128 millihertz low pass filter? The frequency I don't understand.🤔
I got the same results and decided to re-check my math. I think it needs to be a 0.001 uF capacitor. So Rc is a 1.28 kHz filter. I made the circuit and it works with a .001 uF.
Thanks for the videos. The combination of 124k and 10uF gives me a flat line. I am using a 1K pot and a fixed capacitor, so my square wave stats are different than yours. Can you direct me to your video that explains the math to determine the resistor and capacitor?
I did it in LTspice and I used 10mF isntead of 10uF and I got the triangle, although its stunted in volts in a huge way.
also it seems that 124k does nothing because if i remove it from the circuit i still get teh same result
4:15 "A square wave"
Why do we need a sawtooth wave? What's is it used for?why not a square ?
Voltage Comparator Circuit ?
never say you have been doing this for 30 years and then make a mistake. Happened to me.. I was telling some one i have been doing this for thirty years and he said well why did you just make that mistake?
Seriously...people give me crap all the time. Yeah I studied such and such 30 years I don't remember everything. The things I deal with every day sure. Transconductance? Haven't thought about it since college.
Very nice. When are we going to make the sine wave dad?
In the next video in the series. Probably Monday. Do you know what the next step is?
RC circuit
Triangle wave generator
It's a low pass filter.
Thank you very much. Greetings from Germany. University of applied sciences of Münster NRW
I get the wave forms but they are no where near as clean as yours. Any common mistakes I'm making?
Google signal integrity. This is a huge topic.
Varying the capacitor doesn't change the duty cycle, but varying the *potentiometer* changes *both* the frequency and the duty cycle. The addition of a resister and two steering diodes can allow you to change the duty cycle *without* changing the frequency with the pot and then change the frequency with the variable capacitor (without changing the duty cycle), for example as seen in neilwebber.com/notes/wp-content/uploads/2017/01/astable1-768x540.png
Now I must comment. The Pot changes the duty cycle, but it also changes the frequency. Re watch your first video
37 years + 4 years... Thanks lot for video Sir :)
Please tell me
Muchas gracias señor
Very good
Just subscribed. Awesome content. Can't wait for more. :)
New videos every day at 5pm Eastern.
Why does the 555 create a square wave? why isn't it some other shape?
It's digital. It's either on or off. The combination of on and off is a square wave.
Sir I want high frequency generate and I want mix sound frequency
Thank you for telling about the ground, that makes perfect sense now, this video is also very helpful to me, now I will continue to watch part 3, great job.....
Thanks for the video. I love the old 555 timer IC's. Someone gave me a 555 Timer Cookbook last year I think dated the late 70's or early 80's, there was a lot of good cookbook series of electronics books.
555 probably the most used IC in history.
You can do a lot with them for sure, very versatile chip.
Pete, out of curiosity could you please share the reference of this 555 cookbook?
@@laurentd9980 The book is called IC Timer Cookbook by Walter Jung. You can find it at used book sellers.
Edbassmaster, putting people on the news.
@ 4:30, it's a low pass filter, isn't it?
It doesn't matter, but after a year, and seeing as how you still make videos, put one out today... you could have answered the fucking question...
hi, thanks for the nice videos, i am looking for a device can take the AC 220V and take it down to 5 to 24V also AC so it is safe for the younglings to experiment .thank and peace :)
haisam HST you’ll need a transformer
I'm getting notifications.
Very good, sir. Thank you.
In previous films you have been changing frequency by changing variable resistor, now you show that only capacitor changes frequency. So, what is true?
It depends on what role the component plays in a circuit. With an NE555 the capacitor across pins 1 and 2 , the frequency is set. With the resistor across 6, 7 and 8 the duty cycle is set. In an traditional RC circuit (resistor / capacitor) we could vary either the R or the C and change the frequency. I think in this case the R is inside the chip (pin 1) and the capacitor is all we can change. The data sheet shows this. pdf.datasheetcatalog.com/datasheet/fairchild/NE555.pdf
Listen close he used the v.c (var. Cap.) To change the frequency. Potentiometer for duty cycle. It's a simple thing.....i am used to what the function of a (vari cap)
Is though. I build crystal radios and slayer exciters. Aka solid state tesla coils. If u thing of tuning a radio. U spin the knob and the station changes. Well all your doing is taking one frequency and ur spinning that (vari cap) and you will pick up a different frequency.
OOH OOH is that an RC circuit? I feel like we're at the end of a John Wayne WWII movie about submarines! Good part deux!
Thanks buddy. Did you get your box? Yes it's an RC circuit. If you were to put an ac sine wave through it, it would be a low pass filter.
06:06 That's not quite a triangle :q It's just charging/discharging the capacitor, so it follows the exponential curve, which isn't quite a straight line.
Are you going to notice that at 15000 times a second? Looks close enough to me. But i would notice the decrease in amplitude at higher frequencies.
@@E-BikingAdventures Yes, I _would_ notice, even by ear. Something might "look close enough" on the graph, but those curves are not the same, and because of that, they have a very different composition of harmonics (i.e. different spectrum), and this can usually be heard by a trained ear, in a form of "ringing" or other noises. A triangular wave sounds very different than a sine wave, and different than a square wave. Sine waves are pure tones, while triangular waves are a mix of multiple odd harmonics that make the sound more "acute". Even if you approximate the shape of a sine wave with parabolas, they will sound differently despite "looking very similar" on the oscilloscope.
Oh, and even if I wouldn't notice the difference due to the frequencies being much higher than my ears' capabilities, an electronic circuit powered by such a generator _would_ notice the difference as well.
@@bonbonpony . From what I saw in the video, it looked close enough to me. Have you seen how messy bus signals are? A lot worse than the small difference in the video. BTW, I have a diploma in digital electronics. I'm aware of all that stuff.
Great music!
Gee, your function generator circuit is good. Do you have any plans on say putting the PCB board up on PCBWAY's website for order?
I am working on a ne one using the Ad9833, once it;s ready it will be available.
@@learnelectronics I look forward to ordering the boards on PCBWAY's website. Thanks!😁
Filter circuit
6.16 integrator op
Low pass RC filter.
Awesome .
how can we increase Vpp of triangular wave (to about 5V)?Please tell the way sir. Thankyou
Increase the voltage
that's my doubt...how can I increase the voltage?@@learnelectronics
Turn up power supply, add another battery, etc.
I have also blown things up! Your not a real engineer if you haven't!
That is the truth.
learnelectronics working on HV switchgear, 3.3kv and above, I got blasé at times on lower voltages like 415v and 240v which we often worked on live! You soon learn respect once you've had a couple of belts though! Electricity is a good servant but a bad master! My advice to beginners is caution at every juncture!
Rc circuit lol
4:20 Its A RC CIRCUIT!!!
yes a simple rc time circuit, exciting the r and c components with the input signal to shape a triangle.
Now I'm ready to design the perfect 8 voice synthesizer with a bazilllion filters, modulators, arpeggiators resonators adders subtractors dividers integrators differentiators etc etc etc. all on a breadboard!
Rc
Could we do the math? It's always confused me a little
ETA for part 3?
Thursday
Thanks!
That's a low pass
low pass filter
wish someone would do a caps video. in depth somewhat.. like uf is micro but not puff whats puff = not uf or mmf or mmmmffff or or or omg my hair.. i get sooo lost with .01 .001 10puff or uf to mmf to to .. hahhaha