We found this circuit in an old American documentation, but the circuit can still be assembled with ease as the used components are still available. MOSFETs admit equivalents.
This circuit is intended to detect when current flows through the opening of a car door. The...
This low power metronome produces pulses in a small loudspeaker. Pule rate is adjusted by P1 and...
This circuit uses a 4020 counter that divides the frequency up to 210, being found in a former...