This PNP transistor power stage was found in the May 1969 issue of Radio Electronics magazine. The circuit uses a transformer for excitation and requires 10W input for full output power.
The integrated circuit used in this 80's differential amplifier is a quadruple version of the 741...
This circuit was published in a January 1971 issue of Radio Electronics to check television...
This circuit was discovered in an English publication in 1979. The circuit can still be assembled with...