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I recently bought one of these:

When i hooked it up to my 24v power supply and a voltmeter, it was either 0 or 24v with the POT. Nowhere in between. Why is this? Is it becasue this is a PWM device and needs a PWM signal? If so, why did they even include a POT with it...?

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  • \$\begingroup\$ Did you try putting a light load on it - it may not operate as you anticipate without a load \$\endgroup\$ – Andy aka May 13 '13 at 21:08
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    \$\begingroup\$ Whatever else may be going on, a voltmeter (especially a digital one) is not usually able to reliably measure a PWM'd signal - even if at some PWM frequencies you get a proportionate response, at others the reading can be quite wild. \$\endgroup\$ – Chris Stratton May 13 '13 at 21:27
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  1. Put a load on it.

  2. From what I can see (given the lack of datasheet), it should generate a PWM w/ the duty cycle proportional to the value of the pot.

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