We found this circuit in the September 1985 issue of Radio Electronics magazine. It uses CMOS integrated circuits and is part of a larger integrated circuit test project.
This SCR relaxation oscillator was found in an 80's Electronic Design. It flashes a small...
We found this shield circuit in a 1991 technical documentation. The phototransistor can be...
This circuit for old photo enlargers was found in a 1970s RCA manual. The components are from the...