We found this circuit in an Electronics Now from the 1990s. The circuit crashes when light strikes the sensor. Instead of the alarm a relay can be used to drive higher power devices.
This 1980s circuit was found in Motorola documentation. The circuit uses period components that admit of...
This circuit was found in an American 1990s documentation. It can directly trigger a triac when...
This circuit delivers at its output a voltage that proportional to the amplitude of the input...