EMG/NCV amplifier

Discussion in 'The Projects Forum' started by ajapyy, Apr 27, 2013.

  1. ajapyy

    Thread Starter New Member

    Apr 27, 2013
    6
    0
    hi everybody ;)
    I want to design an EMG/NCV amplifier and search for it's circuit in internet.
    anybody has data about my issue ?
    EMG amplifier or NCV(nerve conduction velocity) amplifier ?
    if possible for you, please send help for me ;)
    with best regards ..
     
  2. HadMatter

    New Member

    Aug 16, 2009
    9
    4
    Hey Jappy. I'm currently working on an EMG circuit for school, and have been spring boarding off of this design: http://m.instructables.com/id/Muscle-EMG-Sensor-for-a-Microcontroller/
    It's pretty clear on how to assemble the circuit, although I wish it explained a little better about what was going on in each stage of the design. I'll go ahead and pass on some advice a grad student gave me, to replace the TL072 op amps with TLC2272(s) because they put less noise in the circuit. Also, full disclosure, my project is still a work in progress. something about the final filtering stage isn't working quite right, but it seems to be working up to that point . The people who wrote this instructable also sell ready made kits of this schematic on Mouser, so it's a reasonable assumption I've got something hooked up wrong or something.
     
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  3. HadMatter

    New Member

    Aug 16, 2009
    9
    4
    Update: Got this sucker working. I'm not certain what's going on with the low pass filter in the circuit in this instructable, but according to my calculations the resistor/capacitor pairing sets the cutoff frequency at 1.9Hz which seems decidedly low as it's my understanding muscle impulses fire at 7-20Hz. Maybe the TL072 chips have some characteristic that shifts that cutoff into a more appropriate range. Just be mindful of that one discrepancy and this should work just fine for you.
     
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  4. ajapyy

    Thread Starter New Member

    Apr 27, 2013
    6
    0
    thank you for your feedback,
    in first stage we are a pre-amplifier, then a filter and finally an amplifier.
    have u schematic for stages which in understand how circuit work or can draw circuit in simulation programs such proteus and run it ?
     
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