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Thread: Using a +/-20V PSU on a +/-15V scanner board

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    Default Using a +/-20V PSU on a +/-15V scanner board

    I bought a set of these scanners from Winni: http://www.goldenstarlaser.com/al20k-p-301.html

    The PSU she sent with it produces +/-20V. The board is marked +/-15V. I've asked Winni if this is the recommended voltage but no reply yet. Perhaps she sent the wrong PSU.

    Is this within a normal range of over-driving? Has anyone tried this before? I recall someone recommending increasing the voltage of a scanner set marked +/-12V to +/-15V on another thread somewhere, so I'm hoping this is normal practice.

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  2. #2
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    Problem solved. I adjusted the trimpot on the PSU and dialled the voltage down to 15V.

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    Be aware that most scanner amps need +/- 20V minimum to power the +/- 15 volt regulators on the board. They then have a +/- 15 Volt outlet on the board for powering DMX cards in the projector.

    Just be careful with the markings.

    Steve
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    Thanks, Steve. What would you suggest?

    John from Goldenstar suggested I might damage it if I tried 20V:

    For the galvos, it is necessary to use the +/-15v power supply. It is not the 15v.
    And the 20v power supply would damage the circuit.

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    Quote Originally Posted by robvdv View Post
    Thanks, Steve. What would you suggest?

    John from Goldenstar suggested I might damage it if I tried 20V:
    That email very clearly states +/- 15. I'd use +/-15.

    Steve
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    Seems sensible.

    Thanks again.

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