DC (0..10V) controlled RGB led dimmer


I have tried the DC controlled RGB led dimmer (item VMBRGBDC) without any problems. Here are my questions:

  1. This dimmer has three independent channels of max 5A each, so when used with with a 12V, 14.4W per meter RGB strip it should be capable of driving about 12 meters of strip, correct?

  2. One can also use each one of the channels to drive a 4 m white led strip (again 12V, 14.4W per meter). I wonder, can one connect in parallel the three 5A output channels to drive a 12 meters long white led strip?



  1. Yes, that would be the max. load allowed, if that 14.4W is the total load of the three colours.
  2. Theoretically, it is possible to parallel the three outputs, however, this has not been tested.

I tried paralleling two of the DC inputs, and paralleled the respective two power outputs to dim a 5m white led strip - and it works fine. These dimmers work by outputing 90 Hz pulses, and dim the leds by changing the width of the pulses. So it looks like the pulses of the individual channels are in phase, and so can be paralleled.

I have not yet tried to drive a 12 m long white strip; when I do I’ll let you know. Right now though it looks like Velleman is offering a very useful module, which can be used either as a three channel dimmer of 5A each, or as a one channel dimmer of 15 A.

is it possible to increase the PWM frequency from 90Hz to a higher value?
I have RGB arrays (3 x 3). When moving my eyes I see not the resulting color, but green, red and blue dots instead.
E.g. the LED stripes ALDI sold some weeks ago use 432 Hz, which fully avoids this effect.
(I have no fear of using a soldering iron, are schematics available?)
BR, nipponichi

Sorry, PWM frequency is determined by firmware and cannot be changed.

What is the difference between 0-10V and 1-10V for this device?
Just the voltage range? Is the 1-10V input voltage-controlled?

Yes, 1-10V is voltage controlled.
It is used to make sure that there is a defined ‘OFF’ level (= everything below 1V).