This 1 A circuit was found in a Philips documentation from 1966. The transistor is of the time, but a modern transistor of equivalent power can be used.
The critical point in this 2005 project is the adjustment of the optical system, mainly to avoid...
This circuit is from an English documentation from 1968 but can be assembled with modern...
This circuit can be found elsewhere on this site as part of alarms or sirens. The circuit given is...