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  • Three-Channel Tone Control

  • Created: Sep 01, 2014

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Summary

The input signal is fed via SK1 to the first active stage built around U1. Configured as a noninverting amplifier whose gain is set by the ratio of R3 and R1. In this case, the gain is set at unity. This initial stage is required to isolate the following stage from any loading effects. The output from U1 is fed via three frequency shaping networks to U2. The three networks built from R12, R13, and R14 are also included in the feedback path of U2, another inverting op amp stage. The components associated with the three variable resistors are chosen to give the required frequency control.

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