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Yes MRC make pulse units. I built one long time ago from article in MR. It Worked for two weeks. I then didn't have knowhow to fix it. I also have used an old AT computer power supply, $2, and an adjustable voltage regulator IC from Radio Shack (with the other parts needed to work $5) to build one. Works great but is limited to 12 volts max and needs a 12 volt car light bulb to load it enough to start the power supply. I then bit the bullet and purchased an MRC Prodegy DCC for Xmas and haven't looked back since. It's so nice!
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