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.
This high current switching stage was found in a 1967 EEE. The power transistor is from that time....
The circuit is from an Electronics Hobbyst Handbook from the 90s, being valid for panels of the...
This circuit is from the National Semiconductor Audio Handbook, as it uses an audio power...