ECG using a Sound Card
Medical signal processing on a PC

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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.
Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.
The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.
Component list
R1,R2,R4,R6,R7,R19-22 = 10k
R3,R5 = 22k 1%
R8 = 47k
R9 = 42k2
R10,R11 = 3M3
R12 = 150k
R13 = 4k7
R14,R16 = 47k
R15 = 220
R17,R18 = 100
R23, R24 = 1M
P1 = 10k preset
Capacitors
C1,C2 = 27pF
C3,C10 = 1µF 63V, 5mm lead pitch (no electrolytic cap)
C4 = 100nF
C5-C8 = 100µF 16V radial
C9 = 1nF
C11 = 22pF
Semiconductors
IC1 = TL074 DIP14
IC2,IC4 = TS921 or TL071 DIP8
IC3 = IL300
Miscellaneous
Two wire links
Two 9-V PP3 batteries with connecting clips
Two DIL8 IC sockets
One DIL14 IC socket
PCB, order code 040479-1
PC software and source code, 040479-81
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