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.
This circuit is from a 1965 Motorola documentation. The transistors are of the time as is the...
This circuit measures the conductivity of a saline solution, which is affected by the electrolysis effect....
March 2017 - Coilcraft SLR series inductors for currents up to 100 A can be obtained from Mouser...