Found in a 90s American documentation, this circuit that was used in cars of the time, detects low temperatures and light by activating a warning relay.
This circuit uses a 4020 counter that divides the frequency up to 210, being found in a former...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This unijunction transistor oscillator is intended for Morse code practice. The circuit is from an...