This circuit detects smoke by changing the light falling on the sensor. The circuit was found in the Electronics Experimenter's Handbook of 1991. Optical devices must be used.
This unit is intended to power 2 AA or AAA battery powered applications from the car battery,...
We found this circuit in an English publication from 1977. The circuit does not need a symmetrical power...
This circuit provides a reference voltage for calibration. He uses a diode in a small thermal...