Upon pressing the switch, the circuit generates a pulse whose duration depends on C. The transistors can be BC548 and the power can be between 1 and 6 V. The circuit is from a 1975 publication.
The circuit shown in the figure is suggested by Allegro Micro (www.allegromicro.com) and consists of...
This electronic rheostat with SCR was found in the June 1964 Radio Electronics magazine. The SCR...
Found in Radio Electronics from the 90s, this thermometer uses an integrated circuit that is...