Re: [LAD] Milivoltmeter - Was FOSS Ethernet Soundcard

On Thu, Dec 03, 2009 at 10:29:54PM +0000, Folderol wrote:

> As promised, PDF attached.

Mmmm. Just 1 picofarad of stray capacitance on the switch
and wiring, in parallel with 9M, will create a filter with
its 3 dB frequency in the audio band. And 1 pf is really
nothing, expect more.

This will lead to gross errors at anything but the
lowest frequencies.

Is there any reason why an audio level meter should
have such a high input impedance ?

Ciao,

-- 
FA
Wie der Mond heute Nacht aussieht !
Ist es nicht ein seltsames Bild ?
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