/diy/ - Do It Yourself

>>1273380
>such a pain
Not really. You can get a frequency range of 1:10 with a good stereo potentiometer and two fixed resistors of R/10 in series. After that you have to switch the two capacitors for the next range. The characteristic is f≈1/R of course because all these RC oscillators follow wRC=1 and the required (regulated) gain for the Wien bridge is 3.

If you want a single range, e.g. 20Hz to 20kHz with one capacitor the only reasonable solution is the XR2206 which is current controlled. For Lissajous experiments two independent generators with 200..2000Hz is all you need. A split supply like ±9V or so is nice (no output capacitor) but not mandatory.

Pic: If bulb than discrete..[^.^]