(Topic ID: 234457)

Cheap Power for Bally/Stern Displays - Will this work

By Cheddar

5 months ago

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  • 76 posts
  • 17 Pinsiders participating
  • Latest reply 17 days ago by Pbpins
  • Topic is favorited by 6 Pinsiders


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    #38 4 months ago
    Quoted from dayton:

    If you are in the US (i.e. 120VAC) then with about a dollar or less worth of parts you can easily get 162-163 VDC no problem.

    A single output version uses:
    LM317 Adjustable Regulator
    [quoted image]

    Are you really using an LM317 in an HV environment?

    #43 4 months ago

    <Deleted original post>

    Yes - he does use the LM317AHVT and the LM337T.
    Is it a sound design? No.
    Is it worth arguing any longer as people switch from gas discharge displays to LED's? No

    A bit less inflammatory explanation can be found here:

    #45 4 months ago

    Yes... we have.

    Personally, I like Chedder's use of that boost type switching supply. MUCH more efficient than using a series pass regulator.
    The reason for the excessively sensitive dial is the quite tiny radius of the trimmer that they used. The smaller the radius, the less granularity you get. But for how he is using the supply - it doesn't really matter.

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