We found this circuit in an Electronic Design from 1965. The 4-layer diode is an unusual component these days and can be used in its place with a diac.
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...