Another problem with the analog approach is that the frequencies and amplitudes will drift.Ī much better way to do this is to generate all the sine waves in a processor and add them up digitally. The analog approach will definitely not be compact. Your first sentence mentions you want a whole bank of these things, and you want the design compact. You mentioned this is a audio application, so I can't imagine a good reason for all the analog. Nowadays doing this in analog is silly except perhaps for some very specialized or high frequency applications. This doesn't answer what you asked, but I think relevantly addresses the problem. I'm still not sure what I'll use in the final circuit as AGC, suggestions are welcome. Here is the circuit I've been working from, it's from the National Semiconductor LM386 Low Voltage Audio Power Amplifier datasheet-Īnd this is what my implementation looks like, I don't have a suitable incandescent bulb so I've just replaced it with a 1KΩ pot. Is this a suitable approach for making a compact analog sine wave oscillator?Īlso, how would you suggest I control the frequency, which component value should be changed to achieve this? - I've tried messing with all the resistors to change the pitch, but they all seem to be interdependent. I'll be using the oscillators to do some additive audio synthesis, maybe some FM and I'll probably need some of the oscillators as LFOs.

As I'm working from a single power supply and I'm trying to keep the design small, I've been using the LM386n-1 IC. I've started by making a Wien Bridge oscillator. I'm making a bank of analog sine wave oscillators and I'm interested in keeping the design compact.

Creating a sin wave in mplab xc8