This circuit found in the February 1992 issue of Radio Electronics magazine is designed to adapt an audio signal for use in a computer's ADC. It can be adapted to operate with microcontrollers.
This circuit is from a 1968 General Electric manual. It produces a pulse of light when fired,...
This circuit is from a 2001 Poptronics. The magazine no longer exists, but the components used are...
This circuit is from 1990 documentation. It uses a bridge with LEDs and the potentiometer must be...