Booster for Audio Signals
Cranks up bass & treble
Published in issue 395, November 2009
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'.
Resistors
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
Capacitors
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.
Semiconductors
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)
Miscellaneous
11 pcs PCB solder pin
4 pcs 3-way pinheader (P1,P2)
4 pcs 3-pway socket
PCB, # 080094-1
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