Found in a 90s documentation, this circuit makes use of D1, a switching diode that is uncommon today. D3 is an LED. The circuit monitors 12 V batteries.
August 2016 - It can be purchased from Mouser Electronics new chips from Dialog Semiconductor, the...
With this circuit it is possible to fire an SCR from the light that falls on a phototransistor. The circuit...
Interval pulses emitted by this circuit are picked up in a medium wave radio nearby. The circuit is...