We found this circuit in a Japanese publication in 1967. The circuit consists of a 15 W audio amplifier with germanium transistors including a voltage indicator power supply.
This old 4-channel circuit was found in the December 1994 Electronics Now magazine. The circuit uses...
The 78xx series is manufactured by several semiconductor companies that present ideas for use in...
This circuit that converts very low currents into voltage was obtained in the 80's used component...