ECG simulator
an analogue waveform generator
Published in issue 288, May 2000
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.
Resistors:
R1 = 1MΩ
R2 = 3kΩ9
R3,R4,R12 = 100kΩ
R5 = 18kΩ
R6 = 680kΩ
R7 = 330kΩ
R8 = 3kΩ3
R9 = 2kΩ2
R10 = 47kΩ
R11 = 560kΩ
R13,R14 = 10kΩ
R15 = 150Ω
Capacitors:
C1 = 82pF
C2 = 22pF
C3 = 220nF 5mm pitch
C4 = 470nF 5mm pitch
C5,C6 = 330nF 5mm pitch
C7 = 100nF 5mm pitch
Semiconductors:
D1,D2,D4 = 1N4148
D3 = LED, high efficiency
D5 = zener diode 3 V / 400 mW
IC1 = 4521
IC2 = 4017
Miscellaneous:
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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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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