About the article

ECG simulator

an analogue waveform generator

ECG simulator
Electrocardiograms (ECGs) are used very often for medical examinations, research and the development of biomedical equipment. An ECG simulator thus has a large variety of potential applications.An artificial signal that corresponds to an actual ECG signal is needed for the development and servicing of ECG equipment. This makes it unnecessary to make measurements on people, and in particular with research and repair activities it eliminates a potential risk to the test subject. The simulator described here produces a suitable signal. Since this signal is crystal controlled, it can also be used for the calibration of pulse rate displays.
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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 = 1M?
R2 = 3k?9
R3,R4,R12 = 100k?
R5 = 18k?
R6 = 680k?
R7 = 330k?
R8 = 3k?3
R9 = 2k?2
R10 = 47k?
R11 = 560k?
R13,R14 = 10k?
R15 = 150?
C1 = 82pF
C2 = 22pF
C3 = 220nF 5mm pitch
C4 = 470nF 5mm pitch
C5,C6 = 330nF 5mm pitch
C7 = 100nF 5mm pitch
D1,D2,D4 = 1N4148
D3 = LED, high efficiency
D5 = zener diode 3 V / 400 mW
IC1 = 4521
IC2 = 4017
S1 = slide switch, 2-pole chanegover (Conrad Electronic o/n 708097)
BT1 = 9-V PP3 battery with clip-on leads
X1 = 4.194304 MHz quartz crystal
Enclosure 60x95x23 mm (Conrad Electronic o/n 522864)
3 wander (banana) sockets (2 mm or 2.6 mm)
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