modified 4 months ago

Adjustable Q and Cf Bandpass using two opamps gyrator circuit

00:39:38

• The filter passes only a narrow band of frequencies
• The center frequency is fixed by the 22 nF capacitors and resistor values
• The Q control adjusts how sharply that frequency is emphasized (Upper potentiometer)
• Two op-amps are used to:
   • generate the band-pass response
   • control resonant feedback cleanly and stably
   • Use the lower potentiometer to adjust the central frequency

This is exactly the architecture used in parametric equalizers, where frequency, gain, and Q must be adjustable independently.

published 4 months ago

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