• on Audio/Video/Photography
  • Published in issue 11/2009 on page 67
About the article

Booster for Audio Signals

Cranks up bass & treble

Booster for Audio Signals
Dull and washed-out sound? With modern recording technologies this is unlikely to happen. There are nevertheless situations where a fuller sound would do no harm (live bands, for example, but cheap headphones could also benefit). A small amount of 'effect' could make the sound experience just 'perfect'.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1,R19 = 100kOhm
R2,R3,R20,R21 = 92kOhm
R4,R22 = 1kOhm
R5,R23 = 390kOhm
R6,R24 = 3.9kOhm
R7,R8,R15,R18,R25,R26,R33,R36,R39 = 10kOhm
R9,R27 = 39kOhm
R10,R28 = 100Ohm
R11,R29 = 47kOhm
R12,R30 = 1.5kOhm
R13,R17,R31,R35,R38 = 4.7kOhm
R14,R32 = 2.2kOhm
R16,R34 = 33kOhm
R37 = 470Ohm
P1,P2 = 4.7kOhm logarithmic, stereo
C1,C12,C23 = 220nF, lead pitch 5 or 7.5mm
C2,C13 = 10nF, lead pitch 5 or 7.5mm
C3,C14 = 47nF, lead pitch 5 or 7.5mm
C4,C15 = 3.9nF, lead pitch 5 or 7.5mm
C5,C16 = 10pF, ceramic, lead pitch 5mm
C6,C17 = 1nF, lead pitch 5 or 7.5 mm
C7,C18 = 470pF, ceramic, lead pitch 5mm
C8,C19 = 220pF ceramic, lead pitch 5mm
C9,C20 = 1µF, lead pitch 5 or 7.5mm
C10,C21 = 10µF 50V, radial, bipolar, lead pitch 2.5mm, diam. 8.5mm max.
C11,C22 = 22nF, lead pitch 5 or 7.5mm
C24 = 10µF 63V, radial, lead pitch 2.5mm, diam. 6.3mm max.
C25–C30 = 100nF, lead pitch 5 or 7.5mm
C31,C32 = 100µF 25V, radial, lead pitch 2.5mm, diam. 8.5 mm max.
D1–D6 = 1N4148
D7 = low current LED, red, 3mm
T1,T2 = BC550C
T3 = BC547B
IC1,IC2,IC3 = NE5532, 8-DIP case
IC4 = LM13700 16-dip (e.g. Farnell # 1651866)
11 pcs PCB solder pin
4 pcs 3-way pinheader (P1,P2)
4 pcs 3-pway socket
PCB, # 080094-1

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