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Converting Hi pass to Lo pass

Discussion in 'General Electronics Discussion' started by AFex54, May 24, 2015.

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  1. AFex54


    Apr 10, 2015
    I would like to make high pass clone of this simple low pass filter,
    After a bit of research I think I need to invert the filter and feedback components to do this,
    C9 and C10 become R35s and R35 becomes C9/C10?

    Heres some info and the schematic (VCF in bottom left) :
    It is a low pass "T" type filter (due to the two caps and resistor to ground in the feedback loop resembling a "T"). Feedback resistor R35 (4.7M 1/4W resistor) and the two filter capacitors C9 and C10 (both .001uF ceramic caps) determine the filter's characteristics and gain. The filter's cutoff frequency increases as we decrease the resistance between the junction of the two feedback capacitors and the circuit's virtual ground (this is done by R28 100K potentiometer). The filter's Q increases as we decrease the resistance between the two feedback caps of the filter (this is done by R29 100K potentiometer).
  2. AFex54


    Apr 10, 2015
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