Hypex UCD400 Amp Module Power Supply Pumping

Discussion in 'DIY Discussion' started by Normanguy55, Apr 17, 2022.

  1. Normanguy55


    Aug 24, 2021
    Likes Received:
    Has anyone experienced a power supply bus pumping on this module? I am using this module to drive my subwoofers. When it is connect to a 4 ohm load the -58.0 volt supply pumps up to -71.0 volts and the amp shuts down. When I connect an 8 ohm load the amp runs normally. I have changed several parts in the driver circuit (transistors, capacitors) but nothing helps. I am running a Half Bridge power supply with 10,000 uF capacitors. The amp used to perform flawlessly, until recently. I would appreciate anyone's help. Thanks.

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    Last edited by a moderator: May 5, 2022
    Normanguy55, Apr 17, 2022
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