[Test-Equipment] Source for 1% capacitors?

[Ron]

Do not connect two caps in series to get higher voltage 
rating, as no one can guaranty that DC voltage will 
divide equally between the two caps. For power 
filtering, one can put equal resistors across each cap,
but in your application, I suspect you don't need the 
leakage...

However, if the original is rated 100V, it's possible 
actual voltage is 50 or less. 

-- Ron





________________________________
From: Barry <n4buq at knology.net>
To: test-equipment at mailman.qth.net
Sent: Tue, March 29, 2011 8:40:23 PM
Subject: Re: [Test-Equipment] Source for 1% capacitors?




On Tue 29/03/11  6:50 PM , "jbarnes" jbarnes at aztec-net.com sent:
> The TRW capacitor factory is now:
> 
> http://www.ascapacitor.com/
> They made a lot of special capacitors that are found in Fluke HP etc. I
> have some designed by them when I worked for Varian. The ones I worked on
> have Part number VAR 19 and VAR 20. These were derived from catalog
> poducts.
> The values you are looking for may be found in a decade capacitor box.
> Capacitor are typically in a 1,2,4,4 sequence to make each decade.
> I suggest making each capacitors from a parallel combination.
> 
> for 0.02uF connect two 0.01 caps in parallel. For 0.04 parallel 0.018uF and
> 0.022uF.
> The temperature coefficient is also important. 
> 
> I would start with the capacitor that you can find and change them to
> better ones if you can find them.
> 
> Regards,
> 
> John VE3XRY

I've found a couple of sources for 0.010uF 1% caps.  One of them is a 50V 
version and if I can get by with 50V caps, I think I can even bundle 4 of them 
together as they're pretty small.

http://www.westfloridacomponents.com/AMN001/0.01uF.01uF+50V+1%26%2337%3B+Axial+Monolithic+Capacitor+SA405A103F.html


Thanks,
Barry - N4BUQ

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