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.
We found this circuit in an article in Electronics Now magazine from March 1996. The frequency is limited...
This circuit provides a good audio power from a signal at least 1 V of amplitude. The MOSFET must...
This converter can be used to send information remotely from linear transducers, converting...