This circuit is from the September 1985 issue of Radio Electronics magazine. The circuit has an LED charge indicator and is based on CMOS logic. The MOSFET must be equipped with a heat sink.
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...