Gerry Posted September 16, 2017 Share Posted September 16, 2017 I have some 12v Gobo rotators.I run them off a electric train set controller It would be more convenient to control them via my desk and DMX.Are there such things as DMX to 0-12V DC interfaces?Google, or me, hasn't found any.CheersGerry Link to comment Share on other sites More sharing options...
boatman Posted September 16, 2017 Share Posted September 16, 2017 I have some 12v Gobo rotators.I run them off a electric train set controller It would be more convenient to control them via my desk and DMX.Are there such things as DMX to 0-12V DC interfaces?Google, or me, hasn't found any.CheersGerry Get one of these and change the voltage reference to 12V (you'll need at least a 15VDC supply) or add a bunch of external op-amps with a gain of 1.2. Link to comment Share on other sites More sharing options...
timsabre Posted September 16, 2017 Share Posted September 16, 2017 You'll need a pretty beefy output to run a motor off it, I doubt an opamp would do it. I would try a different approach, put a DMX Led tape controller onto the output of your existing 12v supply. That will control the motor by pwm. The only potential problem with that is it might make a whining noise. Link to comment Share on other sites More sharing options...
Gerry Posted September 16, 2017 Author Share Posted September 16, 2017 Get one of these and change the voltage reference to 12V (you'll need at least a 15VDC supply) or add a bunch of external op-amps with a gain of 1.2.Each analogue output can give up to 20MA, is this sufficient to drive a gobo rotator motor?CheersGerry Link to comment Share on other sites More sharing options...
boatman Posted September 16, 2017 Share Posted September 16, 2017 Probably not but, if you go the external op-amp route, the TCA0372 has a 1A drive capability. Link to comment Share on other sites More sharing options...
gafferted Posted September 16, 2017 Share Posted September 16, 2017 There is the DHA/Rosco DMX DC controller which produces variable -12 to +12 so either direction but it's rather imaginatively priced!http://www.10outof10...o_Lighting.htmlThey do come up on eBay occasionally of course. Edit to add as here in fact http://www.ebay.co.uk/itm/stage-lighting-Dha-2-X-Varispeed-Gobo-Rotators-And-Dc-Controller-DMX-2nd-Lot-/112536060934 Link to comment Share on other sites More sharing options...
Gerry Posted September 16, 2017 Author Share Posted September 16, 2017 Edit to add as here in fact http://www.ebay.co.uk/itm/stage-lighting-Dha-2-X-Varispeed-Gobo-Rotators-And-Dc-Controller-DMX-2nd-Lot-/112536060934Far more than I can afford to pay on my OAP.On closer look are they in fact DMX controlled?CheersGerry Link to comment Share on other sites More sharing options...
maeterlinck Posted September 16, 2017 Share Posted September 16, 2017 As Tim suggests a PWM dimmer - cheapy from fleabay would probably do - should work. Super cheap. Keep an eye on running the motor too slowly, but I'd guess you'll be fine. Link to comment Share on other sites More sharing options...
Gerry Posted September 16, 2017 Author Share Posted September 16, 2017 I hadn't noticed that Tim had edited his reply.I was wondering about PWM dimmers.I have both a 27 channel and a 3 channel controllers that output 0-12V DC at max of 2A per channel. I shall try one of them next week when I get time.CheersGerry Link to comment Share on other sites More sharing options...
timsabre Posted September 16, 2017 Share Posted September 16, 2017 I didn't edit the pwm bit, I just added the comment about noise. Anyway it should work. Link to comment Share on other sites More sharing options...
Gerry Posted September 24, 2017 Author Share Posted September 24, 2017 Tried it out and seems to work OK.Slight whining noise at slow speeds but the SFX of increasing wind will cover the noise as the cyclone hits Dorothy etc before being transported to OZ.CheersGerry Link to comment Share on other sites More sharing options...
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