rhd
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- Dec 7, 2010
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Here's an interesting update. I solved the problem with this board, though I did it without actually figuring out what exactly the problem was - or at least what the root of it was.
The problem, somehow, arose from using the 5V regulator for the LED power source. In fact, the actual split rail circuit worked just fine, but when I introduced the regulated 5V into the equation by connecting the LED panel, problems materialize.
What's interesting, is that the LED panel I'm using supposedly has isolated grounds. IE, a GND for the 5V power supply, and a separate GND for the measurement signal.
Well - that can't be true, because it sure didn't like the 5V regulator using a ground different from the split rail's ground.
The solution was simple - to take the 5V regulator and move it to the positive rail side. I'm hoping that having the additional drain on the + side and not the - side won't create any troubles, because it appears to work great now
The problem, somehow, arose from using the 5V regulator for the LED power source. In fact, the actual split rail circuit worked just fine, but when I introduced the regulated 5V into the equation by connecting the LED panel, problems materialize.
What's interesting, is that the LED panel I'm using supposedly has isolated grounds. IE, a GND for the 5V power supply, and a separate GND for the measurement signal.
Well - that can't be true, because it sure didn't like the 5V regulator using a ground different from the split rail's ground.
The solution was simple - to take the 5V regulator and move it to the positive rail side. I'm hoping that having the additional drain on the + side and not the - side won't create any troubles, because it appears to work great now