Found in an old Popular Electronics this circuit can also be adapted to be used as a shield. In this version the control can trigger loads from the light that falls on an LDR.
For bench use, this circuit functions as a bistable safety switch. The circuit is from a Radio...
The circuit shown is from Motorola's 1990 Linear Databook. Shaded components are optional. The...
We have here an ultra-simple amplifier stage of just one transistor, which can have some uses on...