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.
With calibrated RV1 it is possible to find a zener diode voltage. The integrated circuit is 0 741...
This power supply was originally created for the CB16760E (Loudness System) but can be used in any...
This car turn signal circuit was found in the April 1969 issue of Radio Electronics magazine. The...