This circuit is from a Radio Electronics magazine from August 1990. The indicator module is of a common type at the time.
June 2017 - These new AVX capacitors are suitable for filter applications, considerably reducing...
This traditional SCR flip-flop configuration is from an American publication from the 1970s. The...
Other operational amplifiers in the series, such as the MC34072, MC34074, MC35071, MC35072,...