This receiver for a modulated light intercom was found in a 90s Elektor. The audio amplifier can be replaced by an equivalent. The sensor can be any phototransistor.
This circuit was found in a 1967 documentation. The switch diode is a component of the time and is...
As in the previous case (CB5045E), we have in the circuit of the figure the use of the polarized...
The configuration of this circuit was suggested by an old English publication that comes to...