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Home › Magazines › 2007 › November › Headphone Amp with 3D Sound

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Headphone Amp with 3D Sound

Sound reinforcement for iPod & Co.

Published in issue 371, November 2007

Headphone Amp with 3D Sound
Some audio amplifier designs incorporate ‘loudness compensation’ which boosts the bass and treble frequencies at low volume settings so that the tonal characteristics of the amplifier are perceived as being more linear with respect to the volume setting. The headphone amplifier described here combines a high-spec amplifier IC with a discrete transistor front-end giving additional bass and treble lift together with an audio 3D effect.

Components

Relevant products

Resistors
(SMD 1206 case)
R1,R21 = 33
R2,R22 = see text
R3,R23 = 15k
R4, R24 = 560
R5,R25,R43,R44 = 33k
R6,R12,R26,R32 = 100k
R7,R11,R27,R31 = 1k
R8,R28 = 1kΩ5
R9,R29,R41,R42,R45,R46,R47 = 10k
R10,R30 = 330k
R13,R33 = 2kΩ7
R14,R50,R122,R222 = 0
Capacitors
(SMD 1206 case unless otherwise indicated
C1,C21 = 22nF
C2,C22 = see text
C3,C4,C5,C7,C23,C24,C25 = 470nF
C6,C26 = 470pF
C41,C42,C43 = 4µF7 (SMD 1812)
C44,C45 = 1µF
C50 = 100µF 16V radial (can-style electrolytic)
Semiconductors
T1-T4 = BC847 (SOT-23)
IC1 = MAX4409EUD+ (14-pin TSSOP; Maxim)Miscellaneous
3.5-mm stereo socket, PCB mount with collet nut
PCB, order code 070393-1 from www.thepcbshop.com
Enclosure

Click below to download a PDF copy of this article from Elektor magazine.

 

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Magazine November 2007
UK371 (US $ 6.20)
 

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Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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