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.
The circuit presented is an interface or shield for capacitance measurement as a PC. We found it...
This circuit uses two transistors, the low noise BC549. Its quality is very good and it has a...
The idea of this simple circuit is to use a tape recorder to key a transmitter in code emission....