Based on Radio Shack 276-137, this circuit was found in the December 1995 issue of Electronics Now magazine. The circuit drives an LED but could use a relay instead.
This circuit is from an American 1964 documentation. Transistors of the time are used, but modern...
This oscillator produces a signal with a central frequency in 1 MHz. This frequency can be...
Found in an American documentation from 1968, this circuit senses the temperature through an...