This circuit was found in a 80's Popular Electronics. The sensor can be any phototransistor. The circuit is indicated for an audio link modulated in pulses.
This circuit was found in an Italian magazine Radiorama from 1960, but it can be assembled with...
We found this configuration, which appears on other of our circuits and with the same or different...
This unregulated power supply can source 1.5 A to amplifiers and other circuits. The diodes must...