This switching buck regulator with the NE5560 was found in the February 1980 issue of Radio Electronics magazine. The power transistor must be provided 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...