Bass Boost section + Output Driver With IC

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The Bass Boost section provides two switchable levels of Bass enhancement. The input audio is first low-pass filtered by a second-order LPF, whose cutoff frequency is 100Hz. The LPF is built around IC2C and IC2DThe output of the LPF is given to a MUX based on a CD4052. This mux can choose between ground, an attenuated version of the LPF, and the full LPF output. The selected MUX output is summed with the original audio, yeilding a Bass Boosted signal. The outputs of this section are fed to the final power stage.
The trimpots R21 and R25 are used to set the bass level for the low-bass mode. This is usually not just the midpoint (50%) level, it’s somewhere like 70%. It can be adjusted to personal taste. IC2A and IC2B act as the summing amplifier and output stage driver. 100Ω resistors R11 and R16 are used to prevent the load capacitance from causing instability in IC2A and IC2B. 2μF coupling capacitance is provided.

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This entry was posted on Thursday, September 13th, 2007 at 5:18 pm and is filed under Pre Amplifier - microphone preamp, Tone control - Graphic Equaliser. You can follow any responses to this entry through the RSS 2.0 feed.