Poptronics recommends this circuit for use in the car when the headlights are left on. The circuit uses a sensitive relay with contact current according to the headlights.
This simple neon alternating flashing circuit was found in an old American publication. The...
This circuit for audio applications was found in an English magazine from the 80's. The circuit...
This simple TTL circuit indicates which was the first to press one of the four pressure switches. The...