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  1. 22-03-2017 #17
    john swift's Avatar
    Lives in merseyside, United Kingdom.
    john swift
    Last Activity: 18-01-2021 Has been a member for 9-10 years. Has a total post count of 257. Received thanks 53 times, giving thanks to others 0 times.
    Hi Kev

    do you use two seperate power supplies for the breakout board ?

    I have made a correction to the diagram in post 12
    this is how I expect the breakout boards input circuit to be

    Click image for larger version.  Name: the breakout boards EL817 input circuit.jpg  Views: 1088  Size: 60.4 KB  ID: 21219

    from the limited detail in the photo of the breakout board the two regulator IC's appear to be LM317 plus resistors = 5V regulator for the 74HC245D IC's

    LM2576S switching regulator = 10V regulator for the analogue VFD drive

    John
    Last edited by john swift; 22-03-2017 at 03:46 PM. Reason: add ref to LM317 & LM2576
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