P-MOSFET PWD Shield

by SmittyHalibut.
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2 layer board of 2.71x2.11 inches (68.73x53.47 mm).
Shared on November 29th, 2014 07:42.

For when you need to switch the positive side of your load (common cathode) instead of the negative side (common anode). Most FET shields use N-Channel MOSFETs which switch the ground connection, assuming the positive connection is always connected to power. This shield uses P-Channel MOSFETs which switch the positive, so it’ll work with loads that have a common ground (like this aquarium light )

The input is designed to take a PCB mounted Anderson PowerPole connector, but you can solder wires directly to it just as easily.

Components are as labeled on the board:

  • FQP27P06
  • BSS138
  • 10k 1206 SMT resistor (take your pick)
  • 1N4148 or any other rectifying diode. It’s just there to prevent the Arduino from trying to feed power to a potentially large load hanging off the MOSFETs.

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