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Butcher · 03-25-2006, 10:54 AM

Downside of PWM: Tach output probably won't work (or if it does, it'll most likely give the wrong reading).

mx: a potentiometer is usually used to form a potential divider such that the centre connection can deliver a variable voltage between the voltages on the other two pins.

If the psu and the miniNG have a common ground (likely) you may well be able to just hook the one directly to the other. You may need a pull down resistor or current limiting resistor depending on the configuration of the PSU. Can you post a circuit diagram or pics of the circuit board?

03-25-2006, 10:54 AM	#31
Butcher Thermophile Join Date: May 2001 Location: UK Posts: 1,064	Re: Varying pump speed possible? Downside of PWM: Tach output probably won't work (or if it does, it'll most likely give the wrong reading). mx: a potentiometer is usually used to form a potential divider such that the centre connection can deliver a variable voltage between the voltages on the other two pins. If the psu and the miniNG have a common ground (likely) you may well be able to just hook the one directly to the other. You may need a pull down resistor or current limiting resistor depending on the configuration of the PSU. Can you post a circuit diagram or pics of the circuit board? __________________ Once upon a time, in a land far far away...