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.
May 13, 2015 - Mouser Electronics, Inc., the global authorized distributor with the newest...
This microtransmitter operates at a frequency between 3.5 MHz and 10 MHz determined by the...
This circuit was found in a 1969 Ferranti documentation. It can be implemented with modern...