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Thread: BALLY / STERN Solid State Custom Playfields

  1. #11

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    Switch Matrix and Solenoid testing on Bally head.

    Team Slevbro

    fOr No rAIsOn

  2. #12

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    Modified cabinet With Standard Head

    Super Cabinet /Playfield / Head - test

    fOr No rAIsOn

  3. #13

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    Quote Originally Posted by kress View Post
    Modified cabinet With Standard Head

    Super Cabinet /Playfield / Head - test

    Great progress. Does it have a title yet?

  4. #14

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    " Great progress. Does it have a title yet?"

    VOYAGER 1

    images (1).jpg
    fOr No rAIsOn

  5. #15

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    Quote Originally Posted by kress View Post
    " Great progress. Does it have a title yet?"

    VOYAGER 1

    images (1).jpg
    Don't you mean V'Ger keep up the good work !
    vger.jpg

  6. #16

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    nice work kress

    am doing a custom similar to this using altek boards and Skateballs rules

    Question 1 - what are going to do re a power supply, use original or a modern alternative that is then linked up to the power boards etc?
    Question 2 - are you using flipper mechs of the era or 90's ones as in theory should be more efficient, but then adapt the coils etc?

    interested in your thoughts

  7. #17

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    Quote Originally Posted by swinks View Post
    nice work kress

    am doing a custom similar to this using altek boards and Skateballs rules

    Question 1 - what are going to do re a power supply, use original or a modern alternative that is then linked up to the power boards etc?
    Question 2 - are you using flipper mechs of the era or 90's ones as in theory should be more efficient, but then adapt the coils etc?

    interested in your thoughts
    Q1 Tricky as you have probably guessed the multitap transformers are a rare bird indeed .
    The way forward is as follows.
    a, *40v toroidal transformer solenoid drive.
    b, 12/5v switchmode cpu and GI
    c, *7v toroidal transformer for switched illumination and GI.
    d,no 180v instead 5volt led displays
    These can be hooked directly to the original rectifier board.

    *If the original scr driver boards are to be used a 'zero crossing' is required.


    Q2 Yes williams 50 volt flippers , these have to be toned down with series resistance ( way to powerfull for street level ).
    fOr No rAIsOn

  8. #18

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    thanks for that kress, much appreciate, the electronics side is not my strength

    - I am using a full set of altek so the "zero crossing" should not be a issue? and what does that mean?

    - as for the flippers, you saying that the 50vdc bally / williams flipper assembly hooked up to the altek boards becomes too powerful?

    thanks for your help

  9. #19

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    @swinks
    Too much power is way better than not enough and resistors are cheap!
    2.2ohms @10watts in series with the coil power of each flipper.

    Silicon controlled rectifiers are used for switched illumination in a Bally.
    SCRs once turned on require their supply power to be removed before they can turn off.
    Zero crossing refers to the point in an AC waveform where it crosses thru zero volts - this allows the SRCs to turn off.
    This also appears necessary in the solenoid darlington driver board to allow those transistors to turn off fully
    ( the large resistors on the rectifier board help with this ).
    fOr No rAIsOn

  10. #20

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    There are high voltage psu kits on Ebay for driving VFD displays and Nixie tubes.
    https://rover.ebay.com/rover/0/0/0?m...2F202391124136
    There might be cheaper alternatives this was just the first one that popped up.



    Sent from my SM-G965F using Tapatalk
    It doesn't hurt to ask.

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