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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Linear Ramp Generator (CB5929E)
This circuit appears elsewhere on this site. This is from an American 80's circuit manual....
Solid State Relay (CB25258E)
We found this solid-state relay circuit that can function as a shield in a Radio Electronics...
Microcomputer Shield (CB4309E)
Originally in 1986, this circuit was developed to operate with microcomputers of the time like the...