Reply to "New MTH CP Christmas Stage Boxcar Up in Smoke"

shorlingOGR Forum Member SUPPORTING MEMBER

@gunrunnerjohn posted:
Pictures of the board would help, but it sounds like a typical fixed voltage DC power supply. The power device is probably a three-terminal fixed voltage regulator, a picture of the lettering on that part would probably tell the tale.

GRJ - Attached are photo's of the board. The IC is a 7806A voltage regulator. I'm guessing it's a 6 volt regulator used in a constant current mode. The board damage is in the area of the regulator input and the bridge output, plus side.

On a relook, nearest I can tell the regulator center pin is connected to ground. The resister appears to be in series between the regulator output and the LED connectors.

So, the regulator outputs 6 VDC and resistor is the LED dropping resistor ? So how are the LED's interconnected, in parallel ?

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