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No output on CH 1

+15vdc supply is missing.-15vdc is ok.zener diode(D12)checks ok.

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  • patseunath Feb 17, 2009

    no LMs or 7815s.

    there are two /12watt zener diodes for regulation.

    also some one asked about 8.4k "droppers",these are the "droppers"(load resistors) for the zeners so they will get pretty hot.

    they are supplied from the +-110vdc.

    +-95vdc are across them so they WILL GET HOT.

  • Scott Frye
    Scott Frye May 11, 2010

    Behringer used a resistor and zener off 110 DC for 15 volts?!?!?!?!

    I have the schematic.

    Email me at

  • Scott Frye
    Scott Frye May 11, 2010

    I would think that they use an LM-series or 7815 series reg for the + 15. Can you find either inside?



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