The issue with the music/sound controller is that it doesn't have a common ground. It has common voltage, and each terminal for RG and B are then tied to ground, first passing through some bits on the circuit board (1 transistor each, plus some resistors, then tied to a small IC) to reduce the voltage on input from the remote. This means that the voltage is passing in reverse polarity through the LED strip, -12v instead of +12v. And of course the LED strip will not light up this way.
Lovely. So that controller, as-is, is useless with those LED strips.
One way to salvage the situation would be to add three more power transistors (PNP), one in series with each of the existing R-G-B trio on the controller board, except selected and wired to reverse the voltage output. Those will likely need a pair of resistors each to scale down the ouput of the existing transistors to levels that can be used to control the add-on ones.
Cheers
Previous Topic
Index
