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Recent content by acertain

  1. A

    Help repairing a 20-year-old driver board

    Maybe, but the lines leading to the device are sized for serious current, plus it's got a major heat sink on it, and I can't imagine pulsing the cubes to flip from black to day-glo takes much current. I'll see if I can draw out the circuit. Andrew
  2. A

    Help repairing a 20-year-old driver board

    Reading a little more on the Internet, it seems that this type of circuit is commonly used to build an inverter, but that seems the opposite of what I would expect... Andrew
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    Help repairing a 20-year-old driver board

    I'll see if I can trace it out exactly and post a diagram, but I'm concinved that the UDN2998W is participating in the voltage regulation somehow. The I-out pins are connected to either side of the big capacitor bank that seems almost certainly voltage regulation. I'm getting a little confused...
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    Help repairing a 20-year-old driver board

    Overcast days are pretty easy to come in Seattle this time of year. Daylight hours are a little more restrictive. :) I'll see if I can get some made. I was thinking that a 12v battery might not produce a pure enough voltage, but that's probably silly, eh? Also, what do you suppose the...
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    Help repairing a 20-year-old driver board

    Here's a folder with some photos of the board. https://drive.google.com/folderview?id=0B3q3JM138i9CT0pYN2xIXzk2aWs&usp=sharing The first photo is an overview of the whole board, followed by three close-ups of each third, with some annotations. And then a close-up of the LT1074's resistors...
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    Help repairing a 20-year-old driver board

    Hi all! I'm trying to repair an old Daktronics scoreboard driver board, and I could use some help. I have some basic electronics skills and knowledge, but some of the components here are beyond me. If I can't get it working, we're no worse off than we are today (we'll have to buy a new...
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    Hello, Welcome! (Introduce yourself)

    Hello! Hello! My name is Andrew Certain. I live in Seattle, WA, and I came here because I have a question about a 20-year-old driver board for a scoreboard that I'm trying to get working. Andrew
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