Multiple high frequency oscillators in one pedal... help me avoid problems!

[earthtonesaudio]

I'm thinking of incorporating a switching power supply into my proximity wah design to boost the antenna's range.
The thing is, there's already an oscillator in the circuit (frequency ranges from 30-80ish kHz), and I don't want the switching supply oscillator to mix in with the proximity oscillator and cause theremin-noises.

So... What frequency should my power supply oscillator be to avoid potential heterodyning problems?  1MHz or more...?

Thanks,
Alex

[Paul Perry (Frostwave)]

Any frequency could give problems.
What I would do, is to decouple the oscillator part from the rest of the circuit, by running the power to it via a 220 ohm resistor with filter caps to ground from each end of the resistor.
I had to do that with my ring modulator oscillator.
The problem is, when your local oscillator is at say 80Khz, unless it is a perfect sine wave, it will have harmonics that might interact with the other oscillator.

[earthtonesaudio]

Hm... well I plan on using the higher-frequency oscillator as a switching power supply, and the lower frequency one is a square wave.  I guess I don't really care too much if the higher frequency one becomes noisy, as I can filter that out later.

Thanks for the reply. More to think about...