Battery Eliminator (T1285E)

This tube source already uses solid state rectifiers. We found this transformerless source circuit for high voltage on a Radio Craft from July 1948.

1A Adjustable and Fixed Regulator (CB1207E )
The FAN1117A and FAN1117A-5 integrated circuits from Fairchild consist of fixed and adjustable...
Overtone Crystal Oscillator (CB6184E)
This circuit was found on an 80's Ham Radio. The transistor admits equivalent. The circuit can...
Regenerative 4-transistor receiver (CB20569E)
This sensitive receiver with earphone was found in an English documentation from 1963. The...