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Posts posted by fibrauk

  1. Hi you all:
    Just wanted to tell you that weve tryied the circuit (second version) and it works quite well. We have been able to hear through a speaker the heartbeats. It sounds quite well although it is very noisy so we have to stay still and quiet in order for the circuit to work well... ;D

    Ive got a doubt about the circuit...
    ¿what are the reasons for having a High Pass Filter in U1a of 97 Hz and then a Low Pass Filter (Sallen -Key configuration) of 645 Hz.? wouldn't be better to just put low pass filters? or are trying to do a "band pass" filter?
    thats all, thanks for the help in your posts and the time to post a new improved version  ;)

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