This circuit is based on the light comparison of two LDR sensors. We found it in a 90s Popular Electronics. The transistor must be according to the indicator or load being driven.
We found this decoder in a 1966 General Electric publication. It makes use of general purpose...
Found in General Electric's documentation from 1970, this circuit is indicated for the so-called...
This project was published in the April 1989 issue of Radio Electronics magazine. It drives LEDs...