This circuit is from an American 80's documentation. The integrated circuit is from the time and the sensor consists of a smoke chamber measuring its transparency change.
Using a MAX644 this circuit was found in the April 1989 issue of Radio Electronics magazine. The...
The purpose of this circuit is to emit infrared pulses. However, LEDs for visible light can also...
This circuit was obtained from a Texas Instruments 1985 document. The circuit is powered by 1.5 V...