Elektor Team
About the article

ECG using a Sound Card

Medical signal processing on a PC

ECG using a Sound Card
Is it possible to use a computer with an ordinary sound card to record an ECG (electrocardiogram) signal and measure someone’s pulse? This question has been researched in a university dissertation and answered convincingly in the positive. The heart monitor described here is the fruit of this work, and the software is available for free downloading.
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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 its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

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
C1,C2 = 27pF
C3,C10 = 1µF 63V, 5mm lead pitch (no electrolytic cap)
C4 = 100nF
C5-C8 = 100µF 16V radial
C9 = 1nF
C11 = 22pF
IC1 = TL074 DIP14
IC2,IC4 = TS921 or TL071 DIP8
IC3 = IL300
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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