Unable to get a Wien bridge oscillator to work

[Svein]

 

[Baluncore]

@Svein
I agree. The gate voltage control circuit of a FET can have a longer time constant than a filament globe, and that does reduce harmonic distortion at low frequencies.

 

[Art Harrison]

@Svein
I agree. The gate voltage control circuit of a FET can have a longer time constant than a filament globe, and that does reduce harmonic distortion at low frequencies.

Here's another FET-stabilized Wien bridge oscillator I designed for a pitch theremin, which is an electronic musical instrument:

https://www.theremin.us/Circuit_Library/wienbridge.htm

And here's another circuit I designed using two Wien bridge oscillators (to make a pitch theremin). In this circuit, operational transconductance amplifiers are the regulating elements:

file:///C:/Users/Arthur/Desktop/Theremins/203%20Theremin/203.html

I particularly like the second circuit, however, the operational transconductance amplifiers are generally only available as residual stock, and therefore not recommended for new designs.

 

[Baluncore]

And here's another circuit I designed using two Wien bridge oscillators

That link is to your C: hard drive.

 

[Art Harrison]

That link is to your C: hard drive.

This link should work: https://www.theremin.us/203/203.html