Dimmer switch for 12 volt leds

Discussion in 'General Electronics Chat' started by dave.t.bucks, Jun 13, 2015.

  1. dave.t.bucks

    Thread Starter New Member

    Apr 26, 2015
    I have already posted on here before about the led circuit I want to put together to provide lighting for a microscope.

    I want to power three dimmable 12 volt G4 fitting LEDs, with a dimmable LED driver such as this


    I need a trailing edge dimmer switch (as far as I understand?), the trouble all the commercially available dimmer switches have a minimum load of 10 watts, whereas the bulbs I intend to power will be 6 watts, maximum.

    Where can I get a dimmer that has a suitable minimum load?

    I am not experienced or knowledgeable enough to make a complicated dimmer switch from components.

    Alternatively, can I use a resistor to increase the load up to 10 watts so that the 10 watt minimum load dimmer will work ok? I gather its not a good idea as it will get too hot, or am I wrong?

    Thanks for any help
  2. cornishlad


    Jul 31, 2013
    Those dimmers work at mains voltage and I presume make use of a domestic wall switch/dimmer. It would do no harm to try one if you already have one and you could safely add a few watts of dissipation if it was necessay.
    However I think it might be more convenient to buy a small 12v power supply and use a 12 v dimmer like this: http://www.ebay.co.uk/itm/12-Volt-8...041?pt=LH_DefaultDomain_3&hash=item43cd9b12f1. As far as I know there is no minimum load with these.