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 circuit includes the power supply from the power grid. We found it in Radio Electronics from...
We found this circuit in a 2003 publication. The indicated coil is for capturing the signals in an...
This circuit is from a 1967 publication. The configuration holds true for modern transistors having...