Ceramic capacitor identification - UK Vintage Radio Repair and Restoration Discussion Forum

MrBungle · 17th Dec 2019, 2:57 pm

I recently got a nice mixed lot of parts on eBay and have gone through and filtered most of it into parts boxes. A little stuck on these ceramic capacitors though.

Does anyone know what series these are from? There are some Philips ones in same form in the lot (grey with black band across).

Mostly interested in dielectric type i.e. X7R / C0G as I can get the value with an LCR meter. I assume CG based on the labelling but you never know!

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Dave Moll · 17th Dec 2019, 4:05 pm

Quote:

Originally Posted by MrBungle

I can get the value with an LCR meter.

I assume from the markings that the nominal value is 8.2nF (8200pF), though there's no harm in checking the actual value.

Jon_G4MDC · 17th Dec 2019, 4:32 pm

If that is C0G it is physically far too small for 8200pF.
8p2 I can go with and the printing is a bit off.

MrBungle · 17th Dec 2019, 4:47 pm

Thanks both. It's definitely 8.2pF (comes up as 8.7pF on my LCR45).

So is C0G a possibility?

Dave Moll · 17th Dec 2019, 5:26 pm

OK, I'll accept that's a "p" with it's tail docked.

MrBungle · 17th Dec 2019, 5:32 pm

Yeah the printing is really crap. Decided to build a simple colpitts oscillator with one of the caps soldered to some 4-5 inch wires, get it stable, plug it into my counter, set it in relative mode and then breath on it and see what happens. If it doesn't move a lot then it's C0G enough for me

I've got about 300 of these in different values hence the focus on it.

Maarten · 17th Dec 2019, 6:00 pm

I think the purple band indicates the dielectric.

Radio Wrangler · 17th Dec 2019, 8:27 pm

At that value ,C0G or NP0 are likely. The part would have to be very small if made in a high dielectric constant material. Though you do get some temperature compensating materials in small values

David

joebog1 · 17th Dec 2019, 10:02 pm

They are all Philips ceramic and very long lasting. CG or the top painted black are NPO.
other colours indicate different temp coefficients.

Joe

Terry_VK5TM · 18th Dec 2019, 12:19 am

And a datasheet with more info:-

http://www.farnell.com/datasheets/28758.pdf

MrBungle · 18th Dec 2019, 12:23 am

That's brilliant. Thanks for the info everyone. Very pleased with this lot of parts now! (had unused kemet wet tants, BC NP0/X7R MLCC's and lots of silver micas as well!)

17th Dec 2019, 2:57 pm	#1
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Ceramic capacitor identification I recently got a nice mixed lot of parts on eBay and have gone through and filtered most of it into parts boxes. A little stuck on these ceramic capacitors though. Does anyone know what series these are from? There are some Philips ones in same form in the lot (grey with black band across). Mostly interested in dielectric type i.e. X7R / C0G as I can get the value with an LCR meter. I assume CG based on the labelling but you never know!

17th Dec 2019, 4:32 pm	#3
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Ceramic capacitor identification If that is C0G it is physically far too small for 8200pF. 8p2 I can go with and the printing is a bit off.

17th Dec 2019, 4:47 pm	#4
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Re: Ceramic capacitor identification Thanks both. It's definitely 8.2pF (comes up as 8.7pF on my LCR45). So is C0G a possibility?

17th Dec 2019, 5:26 pm	#5
Dave Moll Dekatron Join Date: Feb 2005 Location: West Cumbria (CA13), UK Posts: 6,130	Re: Ceramic capacitor identification OK, I'll accept that's a "p" with it's tail docked. __________________ Mending is better than Ending (cf Brave New World by Aldous Huxley)

17th Dec 2019, 5:32 pm	#6
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Re: Ceramic capacitor identification Yeah the printing is really crap. Decided to build a simple colpitts oscillator with one of the caps soldered to some 4-5 inch wires, get it stable, plug it into my counter, set it in relative mode and then breath on it and see what happens. If it doesn't move a lot then it's C0G enough for me I've got about 300 of these in different values hence the focus on it.

17th Dec 2019, 6:00 pm	#7
Maarten Dekatron Join Date: Dec 2007 Location: Haarlem, Netherlands Posts: 4,203	Re: Ceramic capacitor identification I think the purple band indicates the dielectric.

17th Dec 2019, 8:27 pm	#8
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,902	Re: Ceramic capacitor identification At that value ,C0G or NP0 are likely. The part would have to be very small if made in a high dielectric constant material. Though you do get some temperature compensating materials in small values David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

17th Dec 2019, 10:02 pm	#9
joebog1 Banned Join Date: Jun 2015 Location: Mareeba, North Queensland, Australia Posts: 2,704	Re: Ceramic capacitor identification They are all Philips ceramic and very long lasting. CG or the top painted black are NPO. other colours indicate different temp coefficients. Joe

18th Dec 2019, 12:19 am	#10
Terry_VK5TM Nonode Join Date: Oct 2010 Location: Tintinara, South Australia, Australia Posts: 2,343	Re: Ceramic capacitor identification And a datasheet with more info:- http://www.farnell.com/datasheets/28758.pdf __________________ Terry VK5TM https://www.vk5tm.com/

18th Dec 2019, 12:23 am	#11
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Re: Ceramic capacitor identification That's brilliant. Thanks for the info everyone. Very pleased with this lot of parts now! (had unused kemet wet tants, BC NP0/X7R MLCC's and lots of silver micas as well!)