This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old documentation and for the components used the frequency is 500 kHz.
This high current switching stage was found in a 1967 EEE. The power transistor is from that time....
The circuit shown was obtained from a 1976s publication for radio amateurs. Its purpose is to...
This simple logic level tester was found in Radio Electronics from the 90s. The inverters are of...