This circuit activates a garage door by the car headlights car or a lantern. The circuit is from a 1967 documentation, making use of period components.
This circuit allows you to use a calculator as a timer by directly activating a sum key with...
Found in American documentation from the 90s, this circuit has a timing system for activating the...
Found in an old American documentation this FM modulator makes use of a varactor diode. The...