This circuit was found in the July 1978 issue of Radio Electronics magazine. The circuit uses a common digital voltmeter as the indicator. The sensors are integrated circuits of the time.
The integrated circuit used is a double 741 from SGS. The transformer is the critical component of the...
This circuit was found in a 2002 documentation. The RF output power transistor must be mounted on a...
This is the circuit of a commercial flash from the 60’s. We found it in a march 1961 Radio...