Single pole switch with pilot
101168
Pilot light on switch comes on when light is off
132950
Scale 30-50 mV signal to 0-5 V range
150560
How to use a flyback diode on a +/-12V motor
158346
Adding 3 way switches
121688
Why do you need 2 resistors when hooking up a transistor as a switch
93985
Control 5v relay through 3.3v GPIO using NPN transistor
5328
Source switch between two batteries
131104
What component to use for audio signal switching?
53916
Is Switching the Neutral OK?
158149
Arduino with 5v Relay
18771
Switch between 5V power supplies?
151393
Toggle Switch to swap the connections of two buttons
156010
Using a diode to ensure current flows in only one direction, without causing a voltage drop
101440
How should I rewire a miswired 3-way switch?
99818
light switch conversion 3 gang to 1 gang
55008
Is it possible to use SIM900 GPIO to control relays without using external MCU?
126022
How to add ground to DC circuit?