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.
When the 24 V battery voltage drops below 18 V, this circuit cuts off its discharge. The circuit...
This HeNe laser power supply was found in the March 1989 issue of Radio Electronics magazine. This...
This interference rejection circuit for telegraphy was found in a 1980s documentation for radio...