Please can someone tell me how I can generate a sine wave and cosine wave with the option of changing the frequencies of the output waves? I understand it can be done through op amps but I'm struggling to find anything of use through my research?
Yeh, I've tried to simulate this but I can't seem to get it working? Is there an input signal to this setup or does it just generate the sine wave and cosine wave when powered up? To change the frequency, I guess I need to change the values of the resistors and capacitors?
Here's an application from Analog Devices, but they produce
multipliers too so they added a couple to make the oscillator
voltage controlled. If you substitute both multipliers with
a stereo potentiometer and connect each half in series with
R1 and R2 you can vary the frequency and you also could make
C1 and C2 switchable to get different ranges.
Yes, you need stabilising to give a sinewave - that's probably why it wouldn't oscillate before, and now you've increased the gain until it does, but too much.