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.
Found in an English documentation from 1989, this font uses current components. Rectifier bridges can...
This circuit was found in the January 1989 issue of Radio Electronics magazine. The circuit sends...
The values of R1, R2, R3 and C1 depend on the signal to be integrated. The circuit is from Radio...