piclist 2001\01\10\133742a >
Thread: Surface mount components
face BY : David VanHorn email (remove spam text)

>Anyone who guesses 15 and 22 pF for the last two, I'll send you
>the caps, and you can measure them.

Build a bridge!
two resistors, two caps (one known, one unknown) and a signal generator.

Ideally, the resistors would be near the impedances of the caps at the test
frequency, but mostly they just need to be equal.

connect an appropriate transformer to the sides, and measure the level of
the signal.
The degree of inequality of the two caps determines the output level, so
tune for minimum "smoke".

There's a lot of fun things you can do with a bridge. :)

Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9

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