freaky but frustrating

[nzlongfellow]

In the final stages of finishing my singing faces and connected up a 27 Channel controller.
When I applied power all the pixels lit up.
There are 8 circuits with Dumb RGB's so 24 outputs used. Running 5V supply.


(Ah i think somewhere 5V is too low to run these boards)... I digress.


THE Freaky part is that when I looked at the lights they were all at the correct colour...NO controller and all DIP switches off.

 

[AAH]

You can run the board off 5V if you mod it alternately you can run the board off 12V for instance but have the outputs switching 5V by connecting all the +ve's to a 5V supply with the -ve of said supply hooked up to 27ch board.

 

[nzlongfellow]

Thanks Alan. I new there was something like that. Cheers.

 

[nzlongfellow]

Alan, I don't have the Ray Wu 27 Channels.
Can you please indicate if I have selected the right areas on my boards to convert to 5V.
Here are the pics of mine.

 

[AAH]

That looks about right but a bit hard to tell without 1 in front of me. The zener is there to provide some protection for the board if you happen to put too high a voltage onto it or you reverse the connections. There's probably no need to remove D2 as it gets bridged out of the circuit by the link/fuse. The fuse probably only needs to be 1/2A rated or thereabouts. It is only powering the pcb logic and ideally should be sized so that it blows before the zener is vaporised if you do something wrong.

 

[nzlongfellow]

That looks about right but a bit hard to tell without 1 in front of me. The zener is there to provide some protection for the board if you happen to put too high a voltage onto it or you reverse the connections. There's probably no need to remove D2 as it gets bridged out of the circuit by the link/fuse. The fuse probably only needs to be 1/2A rated or thereabouts. It is only powering the pcb logic and ideally should be sized so that it blows before the zener is vaporised if you do something wrong.

Thanks Alan, I tried one and it works so ordered the rest of the parts to convert them all.
And D2 does not have to be removed.