Found in a Popular Electronics from the 90s, this circuit makes use of an unusual integrated today. The coils are for the medium wave range.
The excitation of a loudspeaker with a tone of approximately 1 kHz, in an audible warning system, can...
Other operational amplifiers from the same family such as MC34002, MC35001, MC34004 and MC35004 can...
This source of some amps for voltages up to 40 V was found in an Italian magazine Elettronica...