What value for this capacitor ?

dytln_02 · 4th June 2008, 12:03 AM

can some one help me ?
what value for this capacitor ?

KP11520 · 4th June 2008, 03:09 AM

IMO, I would think 75pf and 1000 volts.

Maybe you can find the schematic somewhere (online maybe).

Not sure what SEC means but S is 22% tolerance. You need a more clear answer on that because who knows, SEC might be a manufacturer code.

I hope this helps. Good luck!

Regards//Keith

BTW, what did you use to get a close up picture with that much detail and that sharp and so close?

Geek · 4th June 2008, 03:28 AM

SEC is the mfr. code.

Elvee · 4th June 2008, 09:05 AM

Hi,

This one is not used as a capacitor, but as a spark-gap (probably 1KV).
LV

Geek · 4th June 2008, 09:28 AM

*the invisible gap now becomes blatantly obvious*

D'OH!

Yeah, CRT boards laying around here have a few of these.

dytln_02 · 4th June 2008, 04:22 PM

thank you
This caps. is from broken network hub.

I use nikon coolpix S200 digital camera 7M pixel and optical zoom.
and cropping this picture because is so big..

oshifis · 5th June 2008, 06:09 PM

This is not a capacitor, it is a surge voltage protector. It can be found on every network card in PCs, in modems etc. Normally it is open circuit, but for overvoltage it is short circuit. You can not measure it. I've never seen one faulty.

trodas · 5th June 2008, 07:20 PM

Well, it is still capacitor by definition. 75pF is not that small capacity... Of couse the main job is the overvoltage protection, but that does not mean the capacitance is not there

Of course, this is just nitpicking

LK · 6th June 2008, 05:20 AM

This part is a spark gap rated for 1,000 volts. As stated above, it to protect the circuit against surge voltages (greater than 1,000 volts). However the capacitance for this part is extremely low .75pF. Under normal operating conditions (no surges) this part has essentially no effect on the circuit. Also as stated above these parts rarely fail. One thing that can cause a problem is if debris or dirt gets into the slit (gap) causing a leakage path. You can clear out an foreign material by simply running a piece of paper through the gap.

4th June 2008, 12:03 AM	#1
dytln_02 diyAudio Member Join Date: Jan 2006 Location: solo	What value for this capacitor ? can some one help me ? what value for this capacitor ?

4th June 2008, 03:09 AM	#2
KP11520 diyAudio Member Join Date: Apr 2007	IMO, I would think 75pf and 1000 volts. Maybe you can find the schematic somewhere (online maybe). Not sure what SEC means but S is 22% tolerance. You need a more clear answer on that because who knows, SEC might be a manufacturer code. I hope this helps. Good luck! Regards//Keith BTW, what did you use to get a close up picture with that much detail and that sharp and so close? __________________ If Wile E. Coyote had enough money to buy all that ACME ****, why didn't he just buy dinner?

5th June 2008, 07:20 PM	#8
trodas diyAudio Member Join Date: Jun 2008	Well, it is still capacitor by definition. 75pF is not that small capacity... Of couse the main job is the overvoltage protection, but that does not mean the capacitance is not there Of course, this is just nitpicking __________________ "It is dangerous to be right in matters on which the established authorities are wrong." - Voltaire ...just keep folding, just keep folding... my config

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4th June 2008, 03:28 AM	#3
Geek diyAudio Member Join Date: Sep 2004	SEC is the mfr. code.

4th June 2008, 09:05 AM	#4
Elvee diyAudio Member Join Date: Sep 2006	Hi, This one is not used as a capacitor, but as a spark-gap (probably 1KV). LV

4th June 2008, 09:28 AM	#5
Geek diyAudio Member Join Date: Sep 2004	the invisible gap now becomes blatantly obvious D'OH! Yeah, CRT boards laying around here have a few of these.

4th June 2008, 04:22 PM	#6
dytln_02 diyAudio Member Join Date: Jan 2006 Location: solo	thank you This caps. is from broken network hub. I use nikon coolpix S200 digital camera 7M pixel and optical zoom. and cropping this picture because is so big..

5th June 2008, 06:09 PM	#7
oshifis diyAudio Member Join Date: Mar 2004 Location: Budapest, Hungary	This is not a capacitor, it is a surge voltage protector. It can be found on every network card in PCs, in modems etc. Normally it is open circuit, but for overvoltage it is short circuit. You can not measure it. I've never seen one faulty.

6th June 2008, 05:20 AM	#9
LK diyAudio Member Join Date: Jun 2008	This part is a spark gap rated for 1,000 volts. As stated above, it to protect the circuit against surge voltages (greater than 1,000 volts). However the capacitance for this part is extremely low .75pF. Under normal operating conditions (no surges) this part has essentially no effect on the circuit. Also as stated above these parts rarely fail. One thing that can cause a problem is if debris or dirt gets into the slit (gap) causing a leakage path. You can clear out an foreign material by simply running a piece of paper through the gap.

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