Need Help Reading Ceramic Cap Value

Monolith · 13th December 2004, 01:32 AM

I have a shorted capacitor that I need to replace. The markings appear to be:

XD
1110
BP3E

I am used to seeing 3 digit markings with the first two digits being value plus a third multiplier. I have even seen four digit markings such as "2200" meaning 2200pF. But, 1110 seems to be an odd value for pF capacitor.

If someone can tell me what value this ceramic capacitor is, it would be greatly appreciated (or point me to a good guide).

TIA

wrenchone · 13th December 2004, 01:45 AM

What did it come out of? The markings look like it could be a Raychem PTC, in which case it should look like a short.

djQUAN · 13th December 2004, 01:50 AM

those are PTC resistors used to protect circuits from overcurrents. they usually measure a few ohms to about 0.1ohm or so when cold.

wrenchone · 13th December 2004, 01:57 AM

I just did a little looking around on theweb - the symbol that looks like an "X" is actually the Raychem logo (look closer...), so the part is definitely a PTC/resettable fuse. If anything, it may be saving the application from disaster.... The Raychem line was bought out by Tyco - you may be able to find specs at their web site if you're interested.

Monolith · 13th December 2004, 02:06 AM

Thanks everyone for the great information!

This was from an audio crossover for the tweeters. I had not considered it to be anything more than a capacitor.

djQUAN · 13th December 2004, 02:09 AM

Quote:

Originally posted by Monolith
Thanks everyone for the great information!

This was from an audio crossover for the tweeters. I had not considered it to be anything more than a capacitor.

My MB Quart separates also use those. what made you check them to see if the crossover is faulty?

Monolith · 13th December 2004, 02:11 AM

I was upgrading some parts in the crossover and assumed (made myself an a$$) it to be a cheap ceramic cap. I pulled it to test it and came up as a short.

djQUAN · 13th December 2004, 02:32 AM

so I wasn't alone in this world. :P

I also did an upgrade. just replacing the 4.7uF electro for the tweeter with a polypropylene cap. you can hear the additional "brightness" to the sound.

Monolith · 13th December 2004, 02:35 AM

Quote:

Originally posted by djQUAN
so I wasn't alone in this world. :P

No matter how much I know, there is always something I don't. I learned something new today.

Thanks everyone for the lesson!

djQUAN · 13th December 2004, 02:51 AM

Quote:

Originally posted by Monolith

No matter how much I know, there is always something I don't. I learned something new today.

Thanks everyone for the lesson!

well, before I registered here, I didn't know a lot of things. when you visit here often, you learn lots of new stuff!

13th December 2004, 01:32 AM	#1
Monolith diyAudio Member Join Date: Mar 2003 Location: Ohio	Need Help Reading Ceramic Cap Value I have a shorted capacitor that I need to replace. The markings appear to be: XD 1110 BP3E I am used to seeing 3 digit markings with the first two digits being value plus a third multiplier. I have even seen four digit markings such as "2200" meaning 2200pF. But, 1110 seems to be an odd value for pF capacitor. If someone can tell me what value this ceramic capacitor is, it would be greatly appreciated (or point me to a good guide). TIA

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13th December 2004, 01:45 AM	#2
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	What did it come out of? The markings look like it could be a Raychem PTC, in which case it should look like a short.

13th December 2004, 01:50 AM	#3
djQUAN diyAudio Member Join Date: May 2004 Location: manila	those are PTC resistors used to protect circuits from overcurrents. they usually measure a few ohms to about 0.1ohm or so when cold.

13th December 2004, 01:57 AM	#4
wrenchone diyAudio Member Join Date: Feb 2004 Location: Silicon Valley	I just did a little looking around on theweb - the symbol that looks like an "X" is actually the Raychem logo (look closer...), so the part is definitely a PTC/resettable fuse. If anything, it may be saving the application from disaster.... The Raychem line was bought out by Tyco - you may be able to find specs at their web site if you're interested.

13th December 2004, 02:06 AM	#5
Monolith diyAudio Member Join Date: Mar 2003 Location: Ohio	Thanks everyone for the great information! This was from an audio crossover for the tweeters. I had not considered it to be anything more than a capacitor.

13th December 2004, 02:11 AM	#7
Monolith diyAudio Member Join Date: Mar 2003 Location: Ohio	I was upgrading some parts in the crossover and assumed (made myself an a$$) it to be a cheap ceramic cap. I pulled it to test it and came up as a short.

13th December 2004, 02:32 AM	#8
djQUAN diyAudio Member Join Date: May 2004 Location: manila	so I wasn't alone in this world. :P I also did an upgrade. just replacing the 4.7uF electro for the tweeter with a polypropylene cap. you can hear the additional "brightness" to the sound.

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