The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: Mike Monett
X-Mailer: Mozilla 2.02 (Win16; I)
Subject: Re: SMD Cap Test Fixture
Date: Mon, 13 Jan 2003 08:25:19 -0500
NNTP-Posting-Date: Mon, 13 Jan 2003 08:24:46 EST
Organization: Bell Sympatico
John Larkin wrote:
> This is cool (the thing about mid-page):
> You lay the cap across the gap in the PC board and secure it with a
> tiny plastic clothespin. I saw the clothespins for sale at a local
> Container Store.
> Oh, this guy's meter uses an LC oscillator circuit to do something
> similar to what you're doing. Nice gadget.
Thanks John. I know of this method, but wanted to be able to measure any
cap including electrolytics. His circuit goes to 1.5uF.
I didn't notice the mention of a plastic clothespin but will look for
some. However, I did notice that applying pressure in the middle of the
cap seems to cause a strong frequency shift. I'm thinking an axial force
might help reduce it.
I'm also going to rebuild the circuit and put it in a small Pomona box,
about 1 1/8" X 1 3/8" X 2 1/8", P/N 2417. This will improve the rigidity
and add shielding to reduce hand capacity effects, similar to the
concepts used by hams for stable local oscillators.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup