Suggested by General Electric documentation from 1968, this circuit activates a relay after 60 seconds, keeping it closed. PUT is an uncommon component today.
This sophisticated home alarm was found in a 1992 publication. Using common components, it has...
This circuit produces pulses of great intensity and short duration at a frequency of approximately 1 kHz....
This old voice circuit suitable for telephones of the time was found in a Radio Electronics from...