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...?

  • \$\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
  • 1
    \$\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
  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.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.