Hardware > Lynx Splitter

Leave out transformer?

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soakes94:
Would it be possible to leave the transformer out? I'm in the UK so I'm using 240V and to order the part from digi-key its going to cost me £12 just to get my £3 transformer here, and I thought since it will be positioned beside a PSU could I use the 5V from that?

Steve

n1ist:
To feed it from a DC source, leave off the input connector,  fuse, transformer, bridge, and 680uF cap.
 
If you have a regulated 5V source, also leave off regulator.  Feed 5V to the regulator pin closest to the fuse, and ground to the middle pin of the regulator.

If you have a regulated or  unregulated DC source between 7 and 15V, feed it to the two terminals of the bridge rectifier labeled + and -.  You may want to add a 100nF or 330nF cap in place of the 680uF one to reduce the chance of the regulator oscillating.

/mike

lightingnut:
Hello Mike,
I wanted to check to see if leaving the transformer off the splitter is still the same. I want to power 2 boards with 5v DC and run the power down the same cat5 wire that the DMX will be running in, (not the same pair of wires as the DMX but the same cable). I wonder if the distance from power supply to first board is to far. It will be about 65 feet to first splitter then another 10 feet to the next. Will this be to far for 5 volts to run and not lose too much voltage. What size power supply in regards to amps should I buy?

dmaccole:
I think if I were doing this, I'd us 12 volts to feed the splitters over that far of a distance. Bring the feed into the mounting points that would be the output of the transformer and leave the 7805 and associated caps in place. That way whatever line drop you got over the 65 feet would still be enough to make the 7805 work properly.

\dmc

lightingnut:
What about leaving the fuse and wire connector on the board then run 12 volt DC to the wire connector then on the transformer mounting holes place 2 jumpers to get the 12v DC to the output side of where the transformer would have been mounted. Your thought.

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