This high-powered battery powered flasher was found in General Electric documentation from the 1980s. The circuit can control loads up to 3 A and has a sensor that triggers it in the absence of light.
This circuit is an application for an operational amplifier with field effect transistors from...
This circuit is from a 1993 publication and can be implemented with any optical isolator that has...
This circuit uses a diode as a radiation sensor. The operational ones are old because the...