This circuit can keep a set of lamps on for up to 1 minute, time given by C2 and R2 that can be changed. The load depends on the relay. The circuit is old, from 1988 documentation, but totally viable today.
Found in documentation from the 1980s, this circuit can have several adaptations to use modern...
This receiver for listening to the TR-23 phone was manufactured in Japan in the 1960s. The circuit is...
The frequency of the tone produced by this oscillator depends on the amount of light falling onto...