I have a momentary switch that is usually on and I want my circuit to be off when the switch is letting the signal through, how would I do this?
Turn circuit off when switch is on
switches
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Sure, this makes perfect sense. A DAYTON 5X847 relay would do the job. Its coil rating is 10VA at 120VAC, so you don't need to supply DC to the coil. When it receives 120VAC, it switches its DPDT contacts.
You would wire up the DPDT contacts to the live and neutral of your secondary circuit, routing them either nowhere (off) or to the power strip.
The relay is rated at >20 amperes so it will handle a full residential circuit.
Like this?
simulate this circuit – Schematic created using CircuitLab
That'll work just fine. Regardless of the regulator type and how many are connected to the battery.
Best Answer
Here's a typical low-side switch configuration:
simulate this circuit – Schematic created using CircuitLab
You need to pick a N-MOSFET that can switch completely when Vgs is equal to your power supply voltage. If your supply voltage is very low, this might be difficult to find.
You also need the FET to withstand the full power supply voltage between drain and source when the channel is not conducting.