We found this circuit in the October 1996 Electronics Now magazine. The circuit uses LDRs as sensors and drives relays. The relays must have voltages according to the power supply.
We can use high value electrolytic capacitors in alternating current circuits with the...
This Schimitt trigger with MOS transistors was found in an old American documentation. Modern...
In the figure we have a high input impedance stage with a general purpose PNP transistor. An NPN transistor...