Suggested by a 90s Radio Elecrtronics, this circuit is intended to supply mobile equipment of the time. The transformer data is given next to the diagram.
This circuit is from an American publication from the 60's. The power is on the order of 600 mW....
Other operational amplifiers series, such as the MC34072, MC34074, MC35071, MC35072, MC35074 d...
Found in a European magazine from the 90s, this circuit emits beeps that are several seconds apart to...