What are these Capacitors?

rider · 29th June 2004, 03:55 AM

Hi !
I need to reverse an existing board which is delta-modulator for speech application. The existing board has some big plastic box capacitors(orange color) and non-standard capacitances. They are from Siemens but i can't figure out whats their type (i guess they are Polystyrene (Styroflex?) ) or may be polycarbonate?. I think they are obsolete now? If not where these could be available? If not what could be the replacement?
Please see the attached pic. They are labled as KS 63V, capacitance value with a tolerance letter F, H or J, so they are of very high accuracy.
Please help.

Rider

Sch3mat1c · 29th June 2004, 04:05 AM

Those are usually for across the power line to filter HF hash from power supplies to keep it from going back up the power line, causing interference. Though obviously not this one, 63V won't cut it exactly.

AFAIK, they are mylar (polyester). 6800 = picofarads (pF) = 6.8nF = .0068uF.

Tim

roddyama · 29th June 2004, 05:29 AM

If the guy with this ad on eBay is on the level, those are teflon caps. They look the same.

rider · 29th June 2004, 06:10 AM

Hi!

Thanks for your replies. But please also note that there is a label "KS" on the cap, which is usually code for Polystyrene film/foil. So how can these be Mylar or Teflon?

Thanks

peranders · 29th June 2004, 07:26 AM

I vote also for polystyrene. I think some persons think that it's teflon... or want it to be that.... or just say it in order to get more money for those caps.

Sch3mat1c · 29th June 2004, 07:38 AM

Quote:

Originally posted by rider
Thanks for your replies. But please also note that there is a label "KS" on the cap, which is usually code for Polystyrene film/foil. So how can these be Mylar or Teflon?

Because they look like it.

Hell, I don't care what a cap is, as long as it does it's job.

Tim

moamps · 29th June 2004, 08:01 AM

http://www1.jaycar.com.au/images_uploaded/rescode.pdf

or

http://www.electronics2000.co.uk/dat...f/capmarks.htm

or

......

Regards
Milan

rider · 29th June 2004, 08:41 AM

Hi!

Thanks to all of you for replies. I think "Peranders" made a good point about price. Since Teflon caps are very expensive, so some guys, (like the one on ebay) rate their price too high by misleading about the type. Polystyrene caps are also considered suitable for filtering/audio applications and so as teflon.

About the usage, I have these caps in an Aerospace application card (a delta modulator for speech ), so I guess these must be critical in that place. Also the values i have are odd like 8.25n, and 7n etc with tolerances of 1%-5%. So I feel they DO matter .

Regards
Rider

jacco vermeulen · 4th May 2008, 11:47 AM

Just for completeness, as i tripped over this thread by chance, earlier production type was the B31521=>

jacco vermeulen · 4th May 2008, 12:02 PM

And not exactly cheap, wholesale price in DM, ex VAT (1988)=>

29th June 2004, 04:05 AM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Those are usually for across the power line to filter HF hash from power supplies to keep it from going back up the power line, causing interference. Though obviously not this one, 63V won't cut it exactly. AFAIK, they are mylar (polyester). 6800 = picofarads (pF) = 6.8nF = .0068uF. Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

29th June 2004, 05:29 AM	#3
roddyama diyAudio Moderator Emeritus Join Date: Jan 2002 Location: Michigan	If the guy with this ad on eBay is on the level, those are teflon caps. They look the same. __________________ Rodd Yamashita

29th June 2004, 06:10 AM	#4
rider diyAudio Member Join Date: Jun 2004 Location: Islamabad	But what about KS? Hi! Thanks for your replies. But please also note that there is a label "KS" on the cap, which is usually code for Polystyrene film/foil. So how can these be Mylar or Teflon? Thanks __________________ Rider

29th June 2004, 07:26 AM	#5
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	I vote also for polystyrene. I think some persons think that it's teflon... or want it to be that.... or just say it in order to get more money for those caps. __________________ /Per-Anders (my first name) or P-A as my friends call me

29th June 2004, 08:41 AM	#8
rider diyAudio Member Join Date: Jun 2004 Location: Islamabad	Price issue Hi! Thanks to all of you for replies. I think "Peranders" made a good point about price. Since Teflon caps are very expensive, so some guys, (like the one on ebay) rate their price too high by misleading about the type. Polystyrene caps are also considered suitable for filtering/audio applications and so as teflon. About the usage, I have these caps in an Aerospace application card (a delta modulator for speech ), so I guess these must be critical in that place. Also the values i have are odd like 8.25n, and 7n etc with tolerances of 1%-5%. So I feel they DO matter . Regards Rider __________________ Rider


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29th June 2004, 08:01 AM	#7
moamps diyAudio Member Join Date: Oct 2002 Location: Croatia	http://www1.jaycar.com.au/images_uploaded/rescode.pdf or http://www.electronics2000.co.uk/dat...f/capmarks.htm or ...... Regards Milan

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