This circuit was found in a 90’s Popular Electronics. The power transistors must be equipped with radiators and the transformer has a 2 to 5 A secondary.
This light meter or photometer was found in an American documentation from the 90s. The comparator...
This circuit is from a 1966 NASA documentation. The circuit uses a photodiode as a sensor. The other...
The idea is simple: using a flashlight to cut your TV commercials triggers a relay that turns off...