ORIGINAL: All Day Dan
Paul
''OPTICAL'' KILL SWITCHES EXPOSED!
Check this out! Wires to the ignition module on one side. Wires to your receiver on the other. Connecting them, components and copper circuitry. Isolation, none. The result, coupling from your ignition module right into your receiver. This isn’t the type of kill switch you want to use. Dan.
Both these devices use an Opto Coupler/isolator to provide the isolation between the power side and the rx side
ie all done inside a component on the board, some info on opto couplers in below link.
http://en.wikipedia.org/wiki/Opto-isolator
Scott