USB Audio Recorder
A fully-featured sound card for the Universal Serial Bus

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Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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.
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Component list
R1 = 75?
R2 = 470?
R3 = 680?
R4,R19-R23 = 1?
R5,R6,R7 = 4k?7
R8,R9,R11-R14 = 22k?
R10 = 1k?5
R15,R16 = 22?
R17,R18 = 220k?
R24,R25,R28 = 10k?
R26,R27 = 100?
Capacitors:
C1,C32 = 10nF ceramic, lead pitch 5mm
C2,C9,C13,C18,C20,C22,C24,C36 = 10µF 25V radial, lead pitch 5mm
C3 = 2nF2 ceramic, lead pitch 5mm
C4,C6,C7,C14-C17,C19,C21,C23,C25,C26,C27, C33,C35 = 100nF (SMD shape 1206)
C5,C8,C10,C41-C44,C46 = 100nF
ceramic, lead pitch 5mm
C11,C12 = 22pF
C28,C29,C34,C37,C38 = 47µF 25V radial
C30,C31,C39,C40 = 10pF
C45 = 10µF 63V radial
C47 = 470µF 25V radial
Inductors:
L1 = 1µH5 miniature choke
L2 = 47µH miniature choke
L3-L8 = BLM31A601S (Murata, SMD shape
1206, Farnell # 581-094)
Semiconductors:
D1,D2,D3 = LED, 3mm dia.
D4 = 1N4002
T1 = BC547B
T2 = BC557B
IC1 = TORX173
IC2 = TDA1315H/N2 (Philips)
IC3 = UDA1325H/N106 (Philips)
IC4 = 74HC573
IC5 = 27C512-10, order code 012013-21
IC6 = LE33CZ (ST, Farnell) or LP2950CZ-3.3 (National Semiconductor)
IC7 = 7805
Miscellaneous:
JP1 = 3-way pinheader with jumper
K1 = Cinch socket, PCB mount (e.g., T-709G from Monacor/Monarch)
K2 = USB-B socket, PCB mount
K3,K4 = 3.5-mm stereo jack socket, PCN mount (Conrad Electronics # 732893)
X1 = 48MHz quartz crystal, 3rd overtone, parallel resonance
PCB, order code 012013-1
Disk, order code 012013-11
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