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Thread: Wiring again ...

  1. 04-19-2009, 00:14 #1
    Things
    Things is offline Senior Member
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    Default Wiring again ...

    Well, i've just received my DT25's, and Dave being the great man he is, also loaned me Moncha to test them out with. Now, I only have a sound card DAC, which has only a single ended output, but the galvo's have differential input. How would I wire the sound card DAC to give me the largest possible output image size?

    Cheers,
    Dan
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  2. 04-19-2009, 05:56 #2
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    mixedgas
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
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    You do one of 4 things.


    I. Recalibrate the card's input gain pot if it has one.. NOT RECOMENDED UNLESS YOU HAVE A SCOPE AND A ILDA TEST PATTERN THAT DOES NOT COME FROM A SOUND CARD. Warning, some cards have a pot labeled scale. Its a position sensor gain pot, not a image size control.

    II. Ground the - side of the diff input and connect the sound card dac's signal to the + input, connect the sound card dac's ground to the amplifier's analog ground.

    III build a OPAMP circuit with gain, do not exceed the rated input voltage of the galvo amp.

    IV. Build a single ended to differtial converter circuit.

    Most folks do idea II and live with it.

    Steve
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