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Their Drains should be to the +UB rail.
Their schematic diagram have the source and drain labels on the wrong pins.
I decided to test out the only other motor I had in my house, a $160 linear actuator.
R1 and R5 (and their mirrors on the other side) are used to "default" the circuit to a known good state when power is being applied or removed.The gate of MOSFET transistors are small capacitors, that can retain their last switched state for a long time, unless there is something for them to "bleed" that charge into if driving power is removed.If you do not own a digital multi-meter, please buy one! A $20 Radio Shack one will probably do a good enough job. Typically you just need to measure voltage and resistance.
QuoteTheir Drains should be to the +UB rail.To clarify: The /actual/ drains should be towards the load. Opps your right, brain glitch.I'm correcting my post above to try and prevent future confusion.
I was just not smart enough to use it!