This is a function generator that you guys helped me with in 2011. It was Bill's design that I tweaked with.
I have started back trying get rid of some of the problems as well as optimize the design.
In the design above I use R3 to vary the frequency and R9 to vary the amplitude of the waveforms. I find that the frequency and amplitude changes are not linear at all. Is there any other way or by addition of circuitry I can achieve frequency and amplitude variation?
Also I have no been able to reduce the "tits" in the waveforms.
I have tried changing the RC constant of U2A by increasing the input resistor and lowering the capacitor but that didn't help either.
I have started back trying get rid of some of the problems as well as optimize the design.
In the design above I use R3 to vary the frequency and R9 to vary the amplitude of the waveforms. I find that the frequency and amplitude changes are not linear at all. Is there any other way or by addition of circuitry I can achieve frequency and amplitude variation?
Also I have no been able to reduce the "tits" in the waveforms.
I have tried changing the RC constant of U2A by increasing the input resistor and lowering the capacitor but that didn't help either.