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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Controlled Oscillator 4093 (CB12025E)
This circuit is from a Popular Electronics of December 1993. In it we have the way to externally connect...
Automotive equipment source (CB9116E)
With this power supply it is possible to use automotive devices with currents up to about 8A on the...
Tone decoder (CB9675E)
This circuit was found in a 80’s American documentation. The adjustment trimpot is from 47k to...