This circuit is from a time when this type of feature was not common in line cars. The pulse transformer has a 1: 1 turn ratio and the SCR admits equivalents.
This bistable control uses a 4069 as bistable. The circuit can drive relays up to 100 mA with the...
This transistor tester with different gain ranges was found in documentation from the 1980s. The...
We found this circuit in a 1976 documentation. The FET can be the BF245 and the bipolar transistor a...