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Subject: Filter input
From: Barry Lotz barry_lotz@.............
Date: Tue, 9 Mar 2010 21:30:25 -0800 (PST)

Hi All
I was using multipole LP filters with my seismographs. They use the opamp non-inverting input. The note with the filter design says that the input " must return to ground via a low-impedance dc path". I wanted to reduce in half the input to the filter. I know the output of an opamp buffer would work but if I used a voltage divider w/o the buffer how low of resistor would be considered "low impedance". 


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