This circuit is the digital indicator for the previous circuit and can be used with similar circuits. The circuit is from an article in Radio Electronics magazine, June 1987.
Suggested by American documentation from the 90s, this circuit has separate controls for the...
This sensitive sound or noise activated key can be used in an alarm system. The circuit is from an...
This circuit of old American documentation (1965) can be applied to any transistor. | Clique na...