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I need to find out if it is possible to make such toggle button to be used to turn on/off a load not bigger than 5 A at 12 VDC (car battery). Can a Z44N MOSFET handle this? Something similar to the picture, but able to handle more current.

enter image description here

ocrdu
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Aram Alvarez
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    MOSFETs are available up to hundreds of ampere. Do you already have the touch toggle? – winny Dec 14 '22 at 17:38
  • no, it is an experiment i want to try but use it for real if works: i want to see if it can handle turning on/off a 5A car mini amplifier using a PAM8610 or TDA 7297, both 15w x 2 – Aram Alvarez Dec 14 '22 at 17:50
  • Alright. Start with the touch button and report back when it’s working or you are stuck. – winny Dec 14 '22 at 20:18

1 Answers1

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Here is a classic toggle circuit from a past StackEx thread.

Reduce current in momentary latch toggle / source capacitors

enter image description here

This, plus a sufficiently large power MOSFET, should do what you want. You must add a power supply decoupling capacitor across the gate's power pins.

To this I would add a high-value resistor from the MOSFET gate to its source so it remains off when the circuit is not powered. This also reduces the circuit's susceptibility to radiated noise.

AnalogKid
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