[sdiy] lowpass gate etc - the sounds of capacitors

[Harry Bissell Jr]

I would make a bridge...

two caps in series, and two resistors in series
both legs in parallel.  Meter across the junction
of the two caps and the two resistors. Apply a sine
wave (maybe 1KHz ?) across the top and bottom of the
bridge (where a cap and resistor meet)

If the resistors are matched, the voltage will
indicate
if one cap is 'smaller' or 'larger' than the other.

If they are perfectly matched, the voltage will be
zero.

By the time you set this up and make it work, you
might be buying a new meter anyway. This is NOT going
to work with real small caps unless you buffer it
first. (need REAL low offset opamps)

H^) harry

--- Rob Keeble <rob at emulatorarchive.com> wrote:

> Hi,
> Having concluded that polystyrenes are best for
> filter ladders.... I am
> looking to match them for filter ladders, and I
> wondered if anyone could
> tell me a simple way to measure capacitance with a
> good Fluke meter but one
> that doesn't have a capacitance range. Ideas?
> 
> Why? Because 1% tolerance polys are expensive ($2)
> and 5% are cheap on ebay
> (10c). They are for a Dave Rossum Low Pass Filter.
> 
> Regards
> Rob
> www.emulatorarchive.com
> 
> 
> 
> 
>