This is a complete version of the previous circuit, with several scales and two transistors, one of which is used to amplify the generated signal in order to obtain greater sensitivity. The circuit is from a Radio Electronics from June 1961.

This is a complete version of the previous circuit, with several scales and two transistors, one of which is used to amplify the generated signal in order to obtain greater sensitivity. The circuit is from a Radio Electronics from June 1961.
