2 Watt Amplifier 2:
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3 Band Equaliser: |
3 Band Equalizer: |
300 Watt Subwoofer Power Amplifier: |
45 Watt Single Chip Amplifier With Tone Controls:
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Active Subwoofer & Controller: |
Active Subwoofer: |
Audio Analyzer: |
Audio
Graphic Equalizer:
simple 7 band
equalizer |
Audio Level Meter: |
Audio Output Level Meter: |
Audio Tone Control: |
Bass Amplifier: |
Battery 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.
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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 |
Digital Delay Unit for Surround Sound: |
Digital 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: |
Inverted 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...
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Mic Pre Pan Pot Circuit: |
Mono Audio Equalizer : |
Musical Instrument (Expandable) Graphic Equalizer:
standard
equalizer plus bonus distortion unit |
NHT Subwoofer Amp: |
One Pot to Control Two Channels: |
Parametric & Subwoofer Equalizer: |
Passive 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:
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Soft Switching Amplifier With Tone Controls:
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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 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. |
Subwoofer Filter:
12 dB/octave
low pass filter for subwoofer, includes subsonic filter
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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...
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Voltage Controlled Panner:
variable gain
amplifier circuit |