Artificial signals that mimic a real ECG are essential to the development and service of electrocardiogram (ECG) equipment. Elektor introduced this ECG simulator design in May 2000. As you can see, this DIY project has many potential uses.
Artificial signals that mimic a real ECG are essential to the development and service of electrocardiogram (ECG) equipment. Elektor introduced this ECG simulator design in May 2000. As you can see, this DIY project has a variety of potential uses.
electrocardiogram simulator circuit
By mimicking a real electrocardiogram, tests and research can be conducted without the need for human measurements, greatly reducing potential risks to subjects. This electrocardiogram simulator generates such a signal and, thanks to its crystal-controlled precision, can also be used to calibrate the pulse rate display.
Analog arbitrary signal generator using discrete components. “To generate the test signals in industrial ECG test equipment, microcontroller systems are usually used, which makes them quite expensive, but you’ll probably be looking at them in vain,” says designer J. Holzhauer. Let me explain. “Only two standard logic ICs and some passive components are used. IC1 is a 24-stage binary counter with an integrated oscillator and divider. If the crystal frequency shown is 4,194,304 Hz, A 16 Hz square wave signal appears at the Q18 output (pin 10). Switch S1b receives the second signal (2 Hz or 1 Hz). The 16 Hz signal is a decimal counter with 10 outputs. The second signal is distinguished by the combination of C3 and R3. As shown in the schematic, a needle pulse is present on pin 15 of the decimal counter (IC2). These pulses reset the counter to zero at the appropriate time. The role of diode D2 is to block the negative part of the pulses.
ECG simulator, analog waveform generator.
This ECG simulator circuit is powered by a 9V battery, and the current consumption is approximately 2.5mA, which provides a long battery life. Assembly is quick and easy, as the circuit can be assembled in just minutes using the included printed circuit board.
The ECG tester fits into a small plastic housing
original project
The article “ECG Simulator: Analog Waveform Generator” was published in the May 2000 issue of Elektor. This article is available for free download for two weeks after this news item is published. enjoy! Editor’s Note: This article first appeared in the 2000 edition of ElektorMag. Some components, products (e.g. PCBs), and links may no longer be available. However, we believe that educational content still has value, and we hope that it will inspire you to start a new project.
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