This circuit is from 1994, from a technical documentation from National Semiconductor, but can be adapted to work with more modern components.
Wien Bridge This Vienna bridge oscillator generates a sinusoidal signal whose frequency depends...
This audio oscillator can also be frequency controlled by an LDR. The circuit is from a 1975...
In the 1992 publication, this amplifier is announced as having 400 W pmpo. Power transistors should...