We found this circuit in a 1991s PE Hobbyst Handbook. The circuit fires 10 LEDs that can control incandescent lamps according to their maximum current.
The L200 integrated circuit consists of a 5-terminal current regulator in a TO-22O enclosure that...
This circuit is from a March 1967 Radio Electronics. The circuit applies to general purpose SCRs...
This is an audio amplifier typical of an old tape recorder. The circuit is from a Radio...