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P Channel MOSFET as a Switch Arduino negative Voltage.

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P-Channel MOSFET switch with negative Voltages. (Logic Level zero ). This is a video about using a P-Channel Enchantment Type MOSFET as a switch to turn ON and OFF a LED. this same circuit you can use switch heavy DC load like a motor or DC incandescent light.
You should add a 100-ohm Resistor between the Arduino pin and the Gate terminal of the P Channel MOSFET. This creates a short current spike that can be damage for the Arduino pin. Especially if you plan to do high frequency switching.
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