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  1. J

    DC motors and speed control

    I bought a 120vac to 0-90vdc 400w motor speed controller from Amazon and I was wondering if there was anyway to modify it to get more amperage from it. It has a internal 8amp fuse. I posted a pic of the scr's and 3 diodes. Rest of the board is control with a small transformer and 2a full wave...
  2. J

    120vac to 0-90vdc motor drive

    Hello I need help repairing a 0-90vdc drive. I have powered it up and I get voltage at output to motor but it only varies from 65-90vdc instead of 0-90vdc. I tested pots and some other voltage areas.... I have a schematic I'll post. Moderators note : cropped and rotared picture
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