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Audio Circuits:
Level, Tone and Balance Circuits
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2 Watt Amplifier 2 |
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3 Band Equalizer |
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3 Band Equalizer |
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300 Watt Subwoofer Power
Amplifier |
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45 Watt Single Chip Amplifier
With Tone Controls |
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Active Subwoofer & Controller |
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Active Subwoofer |
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Audio Analyzer |
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Audio Graphic Equalizer |
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Audio Level Meter
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Audio Output Level Meter |
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Audio Tone Control |
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Bass Amplifier |
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Battery Powered Stereo Balance
Control Features Low Distortion
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.
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Better Volume Control
How
to create a log pot that is
better than the "real" thing
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Designing With the LMC835
Digital Controlled Graphic
Equalizer
National Semiconductor
Application Notes,04-Nov-1995
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Digital Delay Unit for Surround
Sound |
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Digital volume control has log
taper
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. |
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Digital Volume Control |
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Dual Channel Digital Volume
Control |
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Electronic level |
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Graphic Equalizer #1 |
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Graphic Equalizer #3 |
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Improved PL tone Decoder |
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Inverted bipolar transistor
doubles as a signal clamp
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...
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Mic Pre Pan Pot Circuit
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Mono Audio Equalizer |
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Musical Instrument (Expandable)
Graphic Equalizer
(standard equalizer plus bonus
distortion unit) |
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NHT Subwoofer Amp |
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One Pot to Control Two Channels |
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Parametric & Subwoofer Equalizer |
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Passive Filters Fill the Bill At
Audio Frequencies
(PDF contains multiple circuits
- scroll to find this circuit.) |
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PC Speaker Volume Control
Circuit |
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Pocket Equalizer for Headphone |
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Simple, Easy Parametric &
Graphic EQ's, Plus Peaks &
Notches |
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Soft Switching Amplifier With
Tone Controls |
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Stereo Width Controllers |
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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 network 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.
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Subwoofer Filter:
12 dB/octave low pass filter for
subwoofer, includes subsonic
filter |
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Three Band Active Tone Control |
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Three Band Equalizer |
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Tone Control #2 |
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Tone Controls With 2x NE 5532:
check also PCB design and notes
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Tone Detector |
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Tone Generator
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Tremolo |
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Use Rotary Potentiometer To
Drive Solid State Volume Control:-
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...
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Voltage Controlled Panner:
variable gain amplifier circuit
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