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Active filters in parallel

Discussion in 'General Electronics Discussion' started by fbchurch2009, Dec 31, 2014.

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  1. fbchurch2009


    Jan 10, 2010

    I am in the process of building these three narrow bandpass filters (see schematic) I chose different values for each of the components (R1, R2, R3, and C). I was just wondering if placing these filters in parallel will change the filter characteristics I initially had? I am wondering because I took some quick measurements of each R1 (which is their 1k ohm resistor) and got a much different values (since all three R1's are in parallel) Will this change my filter characteristics?
  2. Laplace


    Apr 4, 2010
    Not sure what you mean by "measurement of each R1" and how that would give different values from other measurements of R1. Nor can I see how the R1's are in parallel. What I can see is that any level adjustment with one of the 20K potentiometers will change the frequency characteristics of all the filters; however, since the resistance change should be small in relation to the 680Ω shunt resistors and the driving point impedance of the 4.7 μF capacitor, the effect should be negligible.
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