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.
We found this circuit in a 1979 Poptronics. The circuit can be easily assembled with the use of...
Unlike the previous circuit this one trigger when the temperature drops below the set value. The...
A very interesting integrated circuit for step-down converter designs (voltage reducers) with an...