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Audio Graphic Equalizer (LMC835)

2016-01-06 08:57  
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graphic Audio Graphic Equalizer

Audio Graphic Equalizer…[more]

Audio Level Meter

Audio Output Level Meter

Audio Tone Control

Bass Amplifier

Powered Stereo Balance Control Features Low Distortion 06/23/03
Electronic Design – Ideas for Design / low-power, low-distortion circuit
that can be used to balance the left and right headphones or speakers
in battery-powered automotive or computer applications.

Volume Control: how to create a log pot that is better than the “real”

With the LMC835 Digital Controlled Graphic Equalizer: National
Semiconductor Application Notes,04-Nov-1995

Digital Delay Unit for Surround Sound:

volume control has log taper: 04/11/2002? EDN – Design Ideas / Digital
potentiometers provide a compact and convenient way to attenuate
audio-amplifier signals. However, most such potentiometers suffer from
at least one flaw: a nonlogarithmic step increment. To avoid this
problem, a user must usually step.

Digital Volume Control: based on DS1669 Digital Pot IC

Dual Channel Digital Volume Control:

Electronic level

Graphic Equalizer #1

Graphic Equalizer #3

Improved PL tone Decoder

bipolar transistor doubles as a signal clamp: 06/07/01 EDN-Design Ideas /
A number of circuits, such as level detectors and AM demodulators,
benefit from a rectifier with a low offset voltage. Silicon diodes have
an offset of approximately 0.6V and do not work well in low-level
circuitry. A Schottky diode is a bit better…

Mic Pre Pan Pot Circuit

Mono Audio Equalizer

Instrument (Expandable) Graphic Equalizer: standard equalizer plus bonus
distortion unit

NHT Subwoofer Amp

One Pot to Control tw1o Channels

Parametric & Subwoofer Equalizer

Filters Fill the Bill At Audio Frequencies: 02/01/01 EDN-Design Ideas /
PDF contains multiple circuits – scroll to find this circuit.

PC Speaker Volume Control Circuit

Pocket Equalizer for Headphone

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

Soft Switching Amplifier With Tone Controls

Stereo Width Controllers

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.

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

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


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