It serves as a reference, since today we can have simpler and more compact solutions. This circuit is from an Electronics Experimenter Handbook from 1992. The integrated circuits are from that time.
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...