Found in an Electronics News from 1970, this circuit supplies a current of up to 1 A. The integrated circuit is from the era and must be mounted on a heat sink.
The basis of this circuit is a CA3130 operational amplifier. The transistor can be BC548, and the...
This circuit, found in a 73 magazine for radio amateurs, is used in radio localization. The...
This circuit is from an American magazine Popular Electronics of March 1991. The circuit produces both...