DjSwirl Posted May 17, 2012 Share Posted May 17, 2012 How is this working? watch from 5mins onwards just shows you more about the sticks, apart from having the information wrong about how many transmitters / receivers you can have But how are they back feeding this stick. I have just brought one to test (as I have the boxes but not from this supplier) but they must be putting 5v back up the DMX??? Brian Link to comment Share on other sites More sharing options...
timsabre Posted May 17, 2012 Share Posted May 17, 2012 Presumably they are stuffing limited power back up the XLR. Pulsar got into trouble for that a few years ago. Link to comment Share on other sites More sharing options...
themadhippy Posted May 17, 2012 Share Posted May 17, 2012 Phantom power for DMX? Link to comment Share on other sites More sharing options...
matt c Posted May 17, 2012 Share Posted May 17, 2012 I'd think they're using drivers with a high current drive, then putting a schottky bridge rectified across the DMX line. A current limiting resistor, smoothing cap and a low power radio device does the rest. Link to comment Share on other sites More sharing options...
Brian Posted May 17, 2012 Share Posted May 17, 2012 I'd think they're using drivers with a high current drive, ... Maybe but you can get 60mA out of a 'standard' DMX driver. Link to comment Share on other sites More sharing options...
timsabre Posted May 17, 2012 Share Posted May 17, 2012 Maybe but you can get 60mA out of a 'standard' DMX driver. Only when it's in transmit mode... and if it's in transmit mode, how are they receiving the data from the radio receiver? Link to comment Share on other sites More sharing options...
Brian Posted May 17, 2012 Share Posted May 17, 2012 Link to comment Share on other sites More sharing options...
boatman Posted May 17, 2012 Share Posted May 17, 2012 ...But how are they back feeding this stick. The description on Video 1 at about 5:05 says "Pulsed DC". The 75176 can withstand up to 12V on any bus terminal so it may be getting a squirt of DC after each frame is received. Notice that the LED doesn't come on immediately the interface is plugged in so there's probably some negotiation taking place using DMX frames with non-zero start codes. I suspect there's also a rechargeable battery involved too, hence the need for the DC connector. Link to comment Share on other sites More sharing options...
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