Found in RCA documentation from the 90s, this circuit uses components from that time. CA3019 is uncommon today and can be replaced by discrete diodes.
This circuit is from a 1975 Motorola manual. The FET can be the BF245 and the output voltage...
We found this circuit in a 1980 documentation. With basic changes, including transistors that were...
This circuit not only indicates when the battery is on but also when it is low. The circuit is...