We found this circuit in a 1971 documentation. The circuit can be assembled with more modern transistors such as BC548 for Q1, BC558 for Q2 and BD135 for Q3.
This circuit was found in a 1982 Maplin documentation. The configuration applies to almost any JFET....
When this circuit is activated the LED flashes for a moment indicating that the function has been...
When the lights turns off this circuit will produce a sound like a cricket. When the lights are...