(Topic ID: 185133)

MPU 200 Capacitor C-16

By oldschoolbob

7 years ago

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Latest reply 7 years ago by CactusJack
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Meteor Stern Electronics, 1979

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I'm working on a MPU 200 for a friend and I noticed capacitor C-16 looks like it has a crack along the top. But the game still works. I thought I should replace it to be sure. On the capacitor it says ECI 104K 100V. The schematic shows .1 MFD. Is 104K the same as .1 MFD?

Shopping on GPE it has "Capacitor, Radial Polyester, 0.1uF, 100V, 10%" - "Capacitor, Radial Polyester, 0.1uF, 250V, 5%" - "Capacitor, Radial Polyester, 0.1uF, 400V, 10%" I'm guessing any of these would be a replacement.

Thanks

Bob

Sorry for the crappy photo

IMG_3128 (resized).JPG

HI,

Yes they are the same

104 = 100nF or 0.1uF / MFD
K = +/- 10%

Hope that helps

Bob,

Bally/Stern chose a poly cap because they are likely more precise over a range on situations like temp vs ceramic.

Ultimately you need to choose a resistor and cap combination that gets your MPU display interrupt between 320 - 360Hz. Error on the high side or you get visible blinking on the displays. The MPU seems to keep up with interrupts on the high end OK.

Andrew

Thanks guys,

Andrew, I haven't changed the resistor so which of those capacitors do you recommend? Or should I get something else?

Thanks

Bob

Yes all three would work since the circuit only operates at 5v. But the 250v one would be best since it is 5% tollerance.

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