I hooked it up to a speaker but the speaker just makes some noise, flexes up and stays up, then shutters a little and repeats, no sound wave it seems. It should be at 900hz I have a dual + - 9 volt battery supply. Pin 1 is empty as it is just offset. Pin 2 has incoming from pin 6 and is bridged over the OP amp to pin 6 also. Pin 3 is grounded. Pin 4 has - input. Pin 5 is empty. Pin 6 is the output going to res cap res cap res cap res then back to pin 2, 3 resistors are grounded. Pin 7 has the + input. Pin 8 is empty. I wired the speaker after the end resistor before it goes to pin 2 from pin 6, so it should have a full phase shift. Any ideas?
Would the type of capacitor make any difference? The caps are from a few weeks ago and I think they might be electrolytic if that makes any difference?
That circuit does not take into account the biasing of the output due to the connection to ground of the rightmost R. Neither takes into account the AC loading of the phase shift network by R1.
Below is a circuit that deals with both these problems, and also has a soft limiting circuit to avoid the waveform clipping that will otherwise occur. Simulation shows 3rd harmonic distortion of ≈-43dB.
That circuit does not take into account the biasing of the output due to the connection to ground of the rightmost R. Neither takes into account the AC loading of the phase shift network by R1.
Below is a circuit that deals with both these problems, and also has a soft limiting circuit to avoid the waveform clipping that will otherwise occur. Simulation shows 3rd harmonic distortion of ≈-43dB.
Will it still push a frequency with out these changes? These are good changes, I will have to use them. My first goal is to get it working first. Then Ill perfect it
Will it still push a frequency with out these changes? These are good changes, I will have to use them. My first goal is to get it working first. Then Ill perfect it
I just realized that im using all the same resistors for everything. but in the schematics its showing r1 greater than r2 whats the explination of this?
as you can tell im fairly new to electronic circuits.
I just realized that im using all the same resistors for everything. but in the schematics its showing r1 greater than r2 whats the explination of this?
as you can tell im fairly new to electronic circuits.
You have it backwards. The schematic shows R2 greater than 29 times R1. I added the note in red, which means R1 should be much greater than R. I would try R=3.3k, R1=33k, R2=1Meg. The first circuit I posted has fewer constraints.
You have it backwards. The schematic shows R2 greater than 29 times R1. I added the note in red, which means R1 should be much greater than R. I would try R=3.3k, R1=33k, R2=1Meg. The first circuit I posted has fewer constraints.
You should change R2 to 330k. In a simulation, it would not run with 300k, but with 330k, and 18nF caps, it gave me 3.5kHz with very low harmonic distortion (-50dB). You might want to use a 270k or 300k resistor in series with a 50k or 100k pot, and crank the pot value down to where it just breaks into oscillation. This will give you the least distortion.