Its sad, you have done so much hard work for your channel but didn't got much appreciations for your work, i am just random guy for you giving you a message that NEVER GIVE UP :)
That's a matter of time, before the word spreads. Combining theory with practice is IMHO the best way to teach. I will recommend this channel to my pupils this fall.
when everything else seems to fail at making clear and concise sense I end coming back to this channel again and again! Thank you for making these videos!
I definitely appreciate these videos. Electronics is a hobby of mine and it’s easy to get lost in a sea of information. But these videos are clear and explain very well. I’ve learned a lot !
Just a small correction..when you say 121 pF, you mean actually 120pF. The capacitors labeled 121 means kindda just like resistors, the first two digits are significant numbers and the third one is the number of zeros, so 121 would be 12 and add 1 zero in other words, 120pF. When you say "tune-in", do you mean changing the value of the trim pot?
The Fisher Gold Bug 2 metal detector operates at 71kHz and is powered by two 9 volt batteries. So i'm thinking maybe you just invented the oscillator for the Gold Bug 2 metal dector! It uses a crystal in the circuit, so maybe we have to add a crystal to stablize the output. The Fisher GB2 has a worldwide cult following because of its ability to find very small pieces of gold in dry creek beds. The fake Gold Bug 2 from china has a PIC16F886 microcontroller for the oscillator. Thank-you for this great tutorial!
Great looking in my bag of salvage I found two NEC C4570C the datasheet says it's a "dual ultra-low-noise, wideband, op-amp" so now I'm on a hunt for the rest of what I need to build this. However, the old lady still says I'm a pack rat! I don't care I might have save as much as 11 cents on this one. The hunt continues :o)
Thank you for posting the video, it has helped me a lot! I am still learning so apologies if this is a stupid question but pin 4 of the amp goes to negative of the one 9V cell and pin 7 goes to positive of the other 9V cell, both cells are connected in serie SO does that not mean you have 18V (as opposed to 9v) powering the amp? EDIT: Nvm, it's plus and minus 9V which gives 18V, is that right?
I just subscribed and I Will certainly try this out but one question I have is: is this less efficient or as efficient as other pure sine Wave pwm circuits( egsoo2 ) pls reply
the clipping might be due to two factors: the slew-rate of the 741 is complete and utter garbage and makes it nearly unusable beyond 50kHz -although you start seeing weird stuf at the 15kHz mark-, and you might have a couple milivolts of positive offset, which you can actually fix by using the offset inputs of the package.
What exactly do you mean by "detune" at 9:05? Are you detuning the frequency deciding components or are you adjusting the negative feedback with the preset (which you are calling a potentiometer)?
nice one. i need something like dual sine wave generator , 1- 400hz, 2-10khz with amplitude no more then 1v. generaly i need it for cassette tape bias calibration. is there any solution for it?
Yeah I can't get how f=1/(2*pi*RC) works here. Doesn't work with your f, R and C values and doesn't work with mine either.... With 120pf and 10K I get 131kHz not the 85kHz you got on the oscilloscope. Frequency varies with the gain (the ratio of the 100k and 50k pot value).
why and what is determining 75hz as a lower frequency output? i would like to use this circuit as the time base of a power inverter to transform 12v DC on a 220v AC... becouse I see a lot ot circuit that have as an output signal 50hz MODIFICATED SINE SIGNAL.... AND I WONDER IF I CAN REPLACE ORIGINAL TIME BASE CIRCUIT OF MY SCHEMATIC FOR YOUR EXCELENT SINE WAVE SIGNAL....do you understand what I mean?
Would it be possible to generate an AC sinewave output of 40.6 Hz of good quality that can then be passed through an amplifier to achieve 200ohms ready to go to speakers?
Awesome! I’m wanting to build an analog synth module to generate a saw, sine, square, and triangle wave and output it to a DAC where I can record it in my Daw
GREAT VIDEO!! It was really satisfying to see a sine from such a simple circuit. Do you know of any simple circuit that can generate a "variable" freq. sine that oscillates around 60Hz to 250Hz (low freq) while holding the amplitude constant? THANKS MUCH!!!!
Hello. Very nice video. I need to create a 2KHz oscilator to make sound a Toyota lock/unlock buzzer. I have tried a 555 but it is a bit unstable specially with temperature. Do you have a recommendation on how to crate a cheap 2KHz oscilator? Somebody recommended MCU programing.
@anyone that knows , im wanting to make a simple sine wave Generator but i dont have this 741 opamp, will i need to buy this exact chip or can i sub the 741 for any other Opamp ? i have a few just not that one.
would this be a pure sine wave? oh and can you posssibly make a video on how to inverter the signal that way i can connect two signal sources of teh same frequency except out of phase by 180 that way they ahniliate each other
So I had this working, and I have the waveform saved on my oscilloscope to prove it, but after switching out the capacitors to try getting a different frequency, it flatlined. I switched back to the old capacitors and it's still flatlined. Switched the op amp for a new one and still nothing. Same with the batteries. If anyone here can give a suggestion, it would be much appreciated.
A question I have had for a while, how and where do you ground to get a reference voltage of zero? Whenever I hook up to a power supply I don’t know where to ground
bandoflozers Voltage is always relative - it’s the *difference* between the potential of two points in a circuit. So “zero volts” simply means they’re at the same potential. So - and I know this probably doesn’t exactly answer your question - you can set your zero reference kinda wherever you want. In modern DC circuits, we use a “negative ground”, i.e. the negative of the power supply is the ground. But in op-amp circuits, you often need a bipolar power supply (like here, +9V and -9V. Ground is 0V.). Let’s assume we’re using two 9V batteries. For the positive supply, the positive terminal of the battery is the +9V, and the negative terminal goes to ground. The second battery for the negative supply has its positive terminal at ground, and its negative terminal becomes the -9V. And yes, if you measure between the +9 and -9V, your meter will show 18V difference.
Hello. Nice video, but you just described the components and showed the formula to calculate the frequency. You could put a little focus on how the circuit works too. Thanks.
Great stuff, remember tho that putting resistors directly into op amp pins causes noise, it is best to put them in an isolated channel with dupont wires and then connect the wires to the pins of the op amp
@@ahmedbenamor4849 I see, 2/3 of the voltage fall on the high pass filter and 1/3 of the voltage falls on the low pass filter, so the input to the op amp is 1/3 of its output. I assume it's 47k instead of 50k to make the gain a little bit above 3 to account for losses but not way above 3 to avoid clipping the top and bottom of the wave. Thanks!
In fact this oscillator using only one stage is practically useless because the output oscillates in pure sinewave much lower than 1Vpp in output.Buffer or amplify the non inverting input of the op amp with another op amp and you will have the sine wave pulse.
I have used this oscillator but I cannot obtained sine wave like yours. You have very pure sine I need 3khz but not stabile when I touched the resistor it directly goes to zero :( what could be wrong?
I have used buffer and now they are pure thank you :) but I have another problem maybe you can help me, I know it is very difficult without seeing circuits but maybe you can. I have transmitted it through speaker to microphone. at the output of my microphone preamplifier circuit they looks like a square wave having distortion around their peaks what can be problem?is the problem in the speaker or microphone circuit?
(1:30) - don't you mean "...comes back into our non-inverting input." ? You say: "...comes back to our non-inverting output." EDIT: (1:47) "...10K _capacitor"_ ? - Have you been drinking? (9:21) - You say: "..well you can see we've lost any semblance of this being a square wave..." - Surely you mean sine wave ? You need to lay off the booze mate. And I say that as a friend, no offence intended. I still gave you a thumbs up because you used no inductors. Rad!
(9:21) - You say: *_"Well, you can see we've lost any semblance of a square wave..."_* But it never resembled a square wave in the first place. It was a sine wave that you'd generated. >
All I got from this is that these things exist. Sadly zero understanding of how the circuit works, why that layout, those component values, or how it oscillates ah well...
