This primitive solar radio was found in a Gernsback publication from 1960. The transistor is made of germanium of the time and the earphone is magnetic with high impedance.
This 9 W amplifier with transistors from the 60's was found in documentation of the time. The...
The purpose of this 1965 Radio Electronics circuit is to observe cycloid waveforms on a standard...
In this circuit found in the December 1972 Radio Electronics magazine. R can be from 1k to 22k,...