This is a small transistor receiver for the medium wave range made in Japan in the 1960s. The circuit is powered by 9 V and has an output power of 25mW.
This very simple circuit uses a phototransistor and a very sensitive relay (reed type) being used...
We found this circuit in Radio Electronics magazine from January 1958. It uses a neon lamp as the...
The integrated circuits in this application are not very common today. One consists of an A / D...