4-tube reflex (T1662E)

This circuit that uses a loop antenna was found in a 1924 publication. The circuit has several supply voltages and sets of audio and RF coils.

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PUT with 2 Transistors (CB4216E)
The circuit shown simulates a programmable unijunction transistor (PUT). Transistors may be common...
800 Hz Band Pass Filter 741 (CB13712E)
This filter was found in a publication for radio amateurs in 1977. The components can be changed for...
Carrier Operated Relay (CB21756E)
Found in a 1977 publication this circuit is relayed from a signal carrier in a receiver....