Arvin Model 444 (T1083E)

This is a 1946 post-war model radio. The 3-tube receiver has a long-known tube configuration.

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Transistorized Oscillator (CB18944E)
This oscillator is from a European publication from the 1980s. The signal generated is of low...
Aperiodic Butler Oscillator (CB9651E)
Found in American documentation from the 1980s, this circuit can generate signals from 50 kHz to...
Touch Bistable (CB1559E)
A tap on sensor X1 of the circuit shown in the figure causes the flip-flop formed by the 4 NAND...