Bass Control (CB21294E)

This circuit with losses of 20 dB at 350 Hz was found in older documentation, but it applies to modern preamp and amplifier circuits.

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Microtransmitter (CB23575E)
This VHF transmitter was found in Radio Electronics magazine from June 1964. The transistor is an...
Photoelectric relay (CB23650E)
This two-transistor circuit is from a Radio Electronics magazine from April 1965. The transistors are...
Delayed Pulse Generator (CB6470E)
This circuit was found in a 1967 documentation. The switch diode is a component of the time and is...