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Simple, Easy Parametric Graphic EQ`s, Plus Peaks , Notches (

2015-01-12 19:29  
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Soft Switching Amplifier With Tone Controls

Stereo Width Controllers

Subwoofer
Equalizer: The Linkwitz transform circuit is a hugely flexible way to
equalize the bottom end of a sealed loudspeaker enclosure. A speaker
that is corrected using this method is flat from below resonance to the
upper limit of the selected driver. The low frequency roll off point is
determined by the parameters of the transform circuit. Should the
enclosure size be too small and cause a lump in the response before roll
off, this is also corrected. A conventional active crossover netw1ork
is then used to divide the subwoofer signal from the main channel
signals. Note that there is also a separate spreadsheet calculator
available for calculating component values for different situations not
handled by the original circuit.

Subwoofer
Filter: 12 dB/octave low pass filter for subwoofer, includes subsonic
filter

Three Band Active Tone Control

Three Band Equalizer

Tone Control #2

Tone Controls With 2x NE 5532: check also PCB design and notes

Tone Detector

Tone Generator

Tremolo

Use Rotary
Potentiometer To Drive Solid State Volume Control: 01/20/03 Electronic
Design – Ideas for Design / This design idea details how a standard
volume control can be replaced by its solid-state equivalent. Digital
potentiometers are often advertised as replacements for rotary volume
controls. To simulate these controls, many circuits employ up/down…

Voltage Controlled Panner: variable gain amplifier circuit