I bought one of these and hooked up to the sound card of my computer. Now I can see some what of a waveform giving me pulse rate and some idea of the Qt and rr intervals. If you plan on using this for audio output only, you will notice some buzz noise along with the heart contraction noise. It was pretty easy to put together as long as you have a soldering iron and wire snippers. Also you will have to supply a battery to make it work.
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