Differential voltage reference (CB8677E)

Using neon lamps, this circuit from a 1969 publication provides 17 V of maximum voltage or else adjustable.

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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...