We found this circuit in the Radio Electronics magazine of May 1977. The circuit has the frequency given by the components according to the formula next to the diagram.
This circuit generates very high voltages using an old TV flyback. The transformer has a secondary of...
In the circuit of the figure we used a potentiometer of 1 k ohm. We can use a larger...
This circuit uses two diodes in a doubling configuration to receive medium-wave range signals. The...