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audio electronics · passive filter · circuit schematic

5-Band Passive Equalizer for Hi-Fi Tube Amplifier

Tipo Schema elettricoStandard IEEE Std 315 / ANSI Y32.2Motore schematex-circuitAggiornato 26/08/2026
5-Band Passive Equalizer for Hi-Fi Tube Amplifier
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Lo scenario

A line-level audio signal passes through an input resistor to a common bus, where five series RLC branches to ground create adjustable resonance notches at 60 Hz, 250 Hz, 1 kHz, 3.5 kHz, and 12 kHz; the equalized signal is AC-coupled to a 100k load.

Cosa contiene questo disegno

Leggi le decisioni che ne stanno alla base.

01

Selected passive shunt topology rather than active op-amp filters

02

Used series R-L-C branches with fixed resistors to set notch depth per band

03

Added input series resistor and AC output coupling/load for realistic integration

Reuse for passive line-level tone shaping where no active gain is required, especially in tube preamp/amplifier front-ends.

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