Indicated for discriminators adjustment in FM and VHF receivers, this circuit was found in a 90s 73 magazine for radio amateurs. The operational amplifier can be a general-purpose type.
This circuit is from a 1997 English magazine, but it is very current due to the components it...
This circuit is from an Electronics World of 1968. The transistors are of the time and the power...
This metronome circuit was found in an American 1980s documentation. The circuit uses the 4001...