DC pumps

[roblarss]

I have the pump signal wire connected directly to the arduino output and the negative tied into the supply output negative.

I do also have a resistor and cap on the signal line to change the PWM to analog. The speedwave pump doesnt really need the resistor/cap but my jebao wp pump does.

[Ron99]

I run a Speedwave 2640 as my return pump. Been using it for almost a year now. But I'm not using the stock power supply. I'm using a 19V laptop PS with it.