Neozap the self described “An unfortunate name for a site about ECGs” provides details on building three different types of DIY ECGs.
Check it out: Neozap - DIY ECGs

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The Open ECG Project is a project being developed by Dr. Ivor Kovic. The Open ECG Project is a online community conceived around a simple, challenging and worth goal: To develop an Opensource Hardware & Software solution for electrocardiography. The goal of the project is to develop a opensource, low-cost, clinically functional 12-lead PC-based ECG with [...]

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Instructables - The Online Repository of User Generated Hacks and DIY Instruction has a wonderful DIY/Hack on replacing Surgical Lamp Bulbs (you know those bulbs that cost more then we make in one week) with a simple LED Circuit. The DIY/Hack was submitted by a couple of students from Duke University’s Biomedical Engineering Program for their  [...]

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Jason Nguyen over at the University of Utah Engineering School has put together instructions on how to build your own EKG machine for $4.23 using your computer and a couple of components. Jason does present a nice question: If its possible to build an EKG for under $5 and any computer… why do medical devices [...]

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Instructables a DIY (Do It Yourself) user generated instruction database, has detailed instructions on how to build a ESU (Electro-surgical Unit) Tester.
According to the Instructable the device must be able to passively indicate when the cutting energy reaches several different strengths ranging from 20 W to 100 W.
Check it out, let us know what you think.
ESU Tester Instrutable

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Instructables a DIY (Do It Yourself) user generated instruction database, has detailed instructions on how to build a ECG Tester that will output the following:
- Sine Waves
- 1 mVpp4 @ 1 Hz, 5Hz, 10Hz, 50Hz
- Normal Sinus Rhythm Waveform
- Include P wave, QRS complex, T Wave
- 40, 70, 130, 210 bpm5
According to the instructable the device [...]

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