Re: Tech: MM Color Changing LEDs with PinLED WPC-95 driver board

Any idea why this is happening with the PinLED board and not the original
WPC 95 board? Is there something that different with how the different
output transistors work?

Original Board Uses TIP102 http://www.fairchildsemi.com/ds/TI/TIP102.pdf
Pin LED uses STD25NF10L
http://www.datasheetcatalog.org/datasheet/stmicroelectronics/9313.pdf

PinLED Manual and schematics
http://www.pinled.de/pinledeng/html/WPC-95%20Driver%20Board%2010034%20v10.pdf

Jim

"beaver" <ed@xxxxxxxxxxxx> wrote in message
news:25966c68-3984-44f0-9f81-cdd12d6065ab@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
LEDs act different than bulbs when off. A bulb when it is cold will
have a very low resistance. A small trickle of current will not light
them up. An LED however has a sharp 'knee' in its I-V curve. As a
result, before they conduct, LEDs tend to have a high impedance. A
small amount of leakage in the drive transistors is probably causing
this dim light.

You can prevent this by putting a resistor in parallel with the LED.
This shunts the leakage current around the LED. A value around a few
hundred ohms should work.

Edward Cheung CARGPB26

On May 31, 1:52 pm, "Jim Lindsay" <DIES...@xxxxxxxxxx> wrote:
These LEDs are also lighting up when the lights one to the right and
one left of them in the lamp matrix light up. This MM also has the PinLED
WPC-95 driver board. This happens in game play and single lamp test. Is
there a way to make these light up only when they should? They are a very
nice feature but they screw with your game play when they come on at the
wrong times. When I install the normal bulbs the game works properly. I
have
tried these LED in other positions and the same thing happens. Has
anyone
else seen this or know of a fix?

Medieval Madness Color Changing LEDs
(Set/2)http://bayareaamusements.com/Merchant2/merchant.mvc?Screen=PROD&Produ...

I inquired at Bay Area Amusements and received the reply:
Don't know why that would be happening unless some diodes are not
connected where they are supposed to be in the circuit, etc. The driver
board is electrically the same, and we've not heard from anyone else
about
any phantom lighting. You can return the color changing kit if you wish.

Jim



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