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.
This receiver for the citizen's band was found in the Radio Electronics magazine of June 1952. The...
The operational amplifier for this circuit, found in a 1979 publication, may be the 741....
This circuit is of great use today, when solar energy is becoming increasingly important. The...