Wien Bridge
This Vienna bridge oscillator generates a sinusoidal signal whose frequency depends basically on C2 and C4. The circuit is from an Electronics Now from December 1993.
The circuit shown is from an old European publication. In it we have the way to activate a relay...
We found this circuit in a European publication from the 1990s. Transistors are still common types...
This circuit was found in an American documentation and can be added to common amplifiers of any...