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Print Page Chess Computer Community
    General Category => Discussions about Chess Computers => Message started by: mga1103 on February 11, 2011, 04:49AM
	

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Title: Capacitor ratings for Chess Challenger8 ?
Post by: mga1103 on February 11, 2011, 04:49AM

I need to replace a capacitor in a Chess Challenger (8). Anyone know the rating of the large brown caps? The only marking on them are ".1250V" and "Z5V" which I believe are voltage and temp/tolerance values.

Thanks in advance.


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Title: Re:Capacitor ratings for Chess Challenger8 ?
Post by: TerryG on February 13, 2011, 10:23AM

Hi,
My CC8 has the same caps, look like ceramic disc type used roughly 1 per chip for decoupling . See link at the bottom. But the markings look strange. Z means -20 +80% (not that accurate!!). I measured one out of circuit to be about 50nF, but usually they would be 100nF, so I reckon accuracy not too good, they do deteriate over the years.

.1Z50v is (0.1uF = 100nF) Z (tolerance) 50volts.
So a 100nF any tolerance (you will surely get better than 80%) rated at 50volts would presumably suffice. Buy a few they are quite cheap.

Terry

in UK see : -
http://www.maplin.co.uk/decoupling-ceramic-disc-capacitors-318

or just type in 'capacitor markings' on google : -

http://www.google.co.uk/webhp?sourceid=navclient&ie=UTF-8#sclient=psy&hl=en&rlz=1R2ADSA_enGB392&site=webhp&q=capacitor+markings&rlz=1R2ADSA_enGB392&aq=2&aqi=g4g-o1&aql=&oq=capacitor+&pbx=1&fp=a85ada561363a6b5


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Title: Re:Capacitor ratings for Chess Challenger8 ?
Post by: mga1103 on February 13, 2011, 11:03AM

Perfect. Thank you. :)


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Title: Re:Capacitor ratings for Chess Challenger8 ?
Post by: Kostea on February 13, 2011, 02:59PM

TerryG basically nailed it.

You need a ceramic capacitor of 0.1 microFarad at 250 Volts (also known as '100 nanoFarad' or '100 nF'). You can buy any ceramic capacitor marked as type: COG, NP0, X5R, X7R, Z5U, Z5V, etc.

In general, any ceramic capacitor between 10 nF - 100 nF are going to be fine for your particular application.

Z5V means:
Z = -10 degree C (minimum allowed temperature)
5 = +85 degree C (maximum allowed temperature)
V = +22 to -85 percent (capacitance change depending on ambient temperature)
This is about the lowest quality of ceramic capacitors ever made.
They used cheap ceramic capacitors because for decoupling (eliminating switching noise) it is not necessary to have a very accurate value.

Regards,
Kostea



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