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 1967 Electronics World. The circuit can be designed to control other...
This circuit can be used to power loads up to 5 A and the transistors must be mounted on large...
We found this circuit in a publication by General Electric in the 1980s. The transistors and the...