This circuit uses a lamp driven by the Hertz loop and measures its brightness with ordinary photovoltaic cells. The circuit is from a Radio Electronics from February 1964.
This circuit is used to test an inductor (coil) allowing the observation of its opration in an R-L...
We found this circuit in a Radio Electronics magazine from June 1992. The circuit has a power...
This different audio amplifier was found in a 90's Electronic Design. The circuit uses components...