(Topic ID: 234481)

Capacitor question

By Sonora70

4 months ago

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  • 4 posts
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  • Latest reply 4 months ago by Sonora70
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    #1 4 months ago

    I'm doing some battery acid repair on a Stern MPU 200 and C16 is listed as a CP-0.1uF-50 V. Can I substitute with a CCD-0.1 uF-100?

    I dont know the difference between a CP and a CCD capacitor. Thanks for some info....

    15482033960646884386984519928125 (resized).jpg
    #2 4 months ago

    Ceramic caps like that are typically used as 'bypass' capacitors to filter out small spikes at the integrated circuit power pins.
    For a time base circuit like that one - a more stable film type capacitor should be used. Something like a Nichicon QYX2A104KTP or QYX2A104JTP.

    #3 4 months ago

    I did some testing with cheap ceramic cap VS poly film caps in the zero crossing circuit timer. Overall you probably want polyester or some other capacitor that is stable

    Poly caps was very stable the display interrupt stayed really consistent over temperature. The ceramic cap is not. Just breathing hot air onto the board area with the ceramic cap changed the frequency 10hz or so. So with a ceramic cap environment plays a role in how has that timer goes.

    The other side of the argument is the display interrupt does not need to be that consistent. Anything from like 320hz to 400hz does not cause any noticeable issues. Much faster than that and the game may slow down... Like at 450hz chime game will fire the chimes slower because the CPU is off working on the display more often, but otherwise still plays fine.

    For 7 digit games you can see some flicker in the displays always because the CPU has to update more digits. A display interrupt around 360hz instead of 320hz helps some. Below 320hz and the display flicker even more to where it is noticeable.

    #4 4 months ago

    Thanks for the info. I'll be ordering a capacitor.

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