Info on chinese-made DMX modules (3 ch, 12/24v,)

[robisais]

Holidaycoro has similar DMX modules, and i see several in different web sites with all different prices from $8 to $25 apiece. Labels are sometimes different as is the case. But, are these all the same inside?

Also, i see some are specified as 12v, some 24v, another that said it works with 5v-24v. Some say specify at time of order which you would like. Do they all work with 5v-24v, or are there really different models?

Edit- i also just noticed that some say 4A and some say 2A, so that's looking like they really are different devices. I wish there were more specs or manuals online, i can use several dozen, but it's a lot to spend without knowing the differences between the similar modules.

Are they actually supplying constant current? I'm guessing that you have to insert a limiting resistor on each of the outputs- the output voltage is always the same as the input?

Here are two links, one to the holidaycoro version and 2 others i found, they look a bit different, are they the same?

http://leynew.en.made-in-china.com/...DMX-Model-Controller-LN-DMXMODEL-3CH-LV-.html

http://www.holidaycoro.com/3-Channel-DMX-RGB-Controller-p/26.htm

http://store.creativelightingdisplays.com/3-Channel-DMX-RGB-Controller-3CH-DMX.htm

Thanks

 

[robisais]

Bump?