11958	2015-12-07 12:00:29	n1vc	NPO capacitors
Message	Date	From	Subject
Hi, I am trying to stock up my QRP lab with NPO or COG capacitors (I think they are the same thing) in a grab bag form? Maybe grab bag is the wrong term, let's say an assorted collection of common values. Can someone recommend a site that will accept preferably Paypal or at least Credit cards? I am too lazy in my old age to deal with the inconvenience of money orders, etc. Thanks Vince N1VC
11959	2015-12-07 12:21:51	Mike	Re: NPO capacitors
Try danssmallpartsandkits.net (Dan's small parts). I don't think they take credit cards, but I believe they do take personal checks. I've place many orders with Dan over the years and I am a satisfied customer (with no affiliation). 73 Mike N4MWP
11960	2015-12-07 12:28:24	K5ESS	Re: NPO capacitors
Here’s one possibility. Might be others on Ebay as well. http://www.ebay.com/itm/18-values-360pcs-Multilayer-Ceramic-Capacitors-Assortment-Kit-5pF-820pF-NPO-COG-/261420013698 Mike K5ESS
11961	2015-12-07 12:47:55	chuck adams	Re: NPO capacitors

11962	2015-12-07 13:09:51	Rod	Re: NPO capacitors
Hi Mike digikey.com has no minimum order dollar value, and they have an incredible stock of parts. Plenty of C0G and NPO Rod
11963	2015-12-07 21:01:59	Tayloe, Dan (Noki...	Re: NPO capacitors
I think that I saw somewhere that things are changing enough in ceramics used for caps that NPO/COG for some brands might not be what they used to be. The NPO/COG label is simply meeting a temperature vs. change graph target and not necessarily “NPO” as you are hoping they would be. I have always had good success with the Xicon disc caps from Mouser. Go to Mouser and search for “Xicon Ceramic Disc Capacitors“ From the pick list select “NPO/COG” and “50v”. You should then see the full line of reasonably good Xicon NPO disc caps. If you want surface mounted caps, I cannot help you except to recommend that you use 1206/0805 sized parts and not something smaller. The smaller the part, the more likely a higher capacity, less stable ceramic will be used. By the way, polystyrene caps that we use to stabilize VFOs (~N220 temperature compensating) are drying up as well. Xicon happens to make those as well. In Mouser look up Xicon Film Capacitors, then pick polystyrene from the pick list. - Dan, N7VE
11968	2015-12-08 09:20:51	Prem	Re: NPO capacitors
Vince, if your immediate requirement (as opposed to stocking) is just a couple of specific values of C0G, I can send them to you free in an SASE. Let me know and I'll see if I have those values in my collection. SMDs only (no through-hole in my collection). Prem.
11970	2015-12-08 10:37:30	Lee Hiers	Re: NPO capacitors

11971	2015-12-08 11:35:44	Tayloe, Dan (Noki...	Re: NPO capacitors
As close to zero as possible as opposed to being as close to the specification limit for COG as possible. - Dan Sent from my Windows Phone
11972	2015-12-08 12:21:05	Ekwik	Re: NPO capacitors
See http://www.calramic.com/Design/Assets/PDF_files/AN110-Voltage-Temperature-Coefficient.pdf Sent from my iPad
11973	2015-12-08 12:39:46	n1vc	Re: NPO capacitors
First of all thanks for all of the responses. No, I don't have an immediate need, I am just stocking up on parts I think I will possibly need in the future. Vince
11974	2015-12-08 12:54:05	Bill Carver	Re: NPO capacitors
EXCELLENT information Ekwik W7AAZ
11989	2015-12-10 15:31:11	afu	Re: NPO capacitors
Hi, in the past people used a intelligent way of compensatimg the thermal coefficient of the coil - when needed - with a NON NP0 capacitor ?! The world was strange and it change to be strange in a different waz ! Herbert Am 08.12.2015 19:35, schrieb 'Tayloe, Dan (Nokia - US/Irving)' dan.tayloe@nokia.com [emrfd]: > As close to zero as possible as opposed to being as close to the specification limit for COG as possible. > > - Dan > > Sent from my Windows Phone > ________________________________ >
11990	2015-12-10 15:31:34	afu	Re: NPO capacitors
Am 08.12.2015 19:35, schrieb 'Tayloe, Dan (Nokia - US/Irving)' dan.tayloe@nokia.com [emrfd]: > As close to zero as possible as opposed to being as close to the specification limit for COG as possible. > Hi , it is sometime more interesting to have a capacitor with a dielectric behaviour that is NOt depending on field strenght / voltage. But even there NP0 is the best solution in manz cases ! Herbert > - Dan > > Sent from my Windows Phone > ________________________________ >

I have always had good success with the Xicon disc caps from Mouser. Go to Mouser and search for “Xicon Ceramic Disc Capacitors“