12 V battery indicator (CB9137E)

This circuit with two LEDs indicates the status of a battery with two reference voltages. The LEDs can be of different colors.

Output transistors protection (CB8373E)
Found in a 1964 Electronic Design, this circuit protects the transistors of a complementary output stage. The...
12 V x 1 A Power Supply (CB8682E)
Found in a 70s RCA manual, this circuit uses transistors from the era. Equivalent types can be...
Timed Sequential Controller (CB4453E)
This circuit found in a 1988 documentation consists of a timer or sequential timer controller. The...