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DIY ECG notes: Difference between revisions

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** Cheaper version: [http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=AD620ANZ-ND AD620A]
** Cheaper version: [http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=AD620ANZ-ND AD620A]
** Expensive version: [http://parts.digikey.com/1/parts/453660-ic-amp-inst-25mhz-prec-ln-16cdip-ad624ad.html AD624AD]
** Expensive version: [http://parts.digikey.com/1/parts/453660-ic-amp-inst-25mhz-prec-ln-16cdip-ad624ad.html AD624AD]
* Better op amp - OP97 (need to review data sheet)


== PARTS for basic version(s) ==
== PARTS for basic version(s) ==

Revision as of 06:01, 25 March 2010

Notes and scratchpad for DIY ECG project

Page maintained by User:Obscurite


PARTS for higher-precision version(s)

  • Instrumentation Amplifiers (not sure why these are priced so differently)
    • Both have CMMR of 110+ for gain of 1000, so they should both work equally well. AD624AD is referenced in the sciam article, but it also mentions the AD620A which is 1/3 the cost at about $7.
    • Cheaper version: AD620A
    • Expensive version: AD624AD
  • Better op amp - OP97 (need to review data sheet)

PARTS for basic version(s)

  • LM358 or LM324 (quad vs dual) op amps (or LF353 which is pin compatible)
  • Diodes
  • 0.1uF capacitor(s)
  • Variety of 1/4 watt resistors (10k, 100k, etc)
  • shielded wires for electrodes (phone or coax cables)
  • electrodes (soldered pennies, medical electrodes, etc)

References

These sites, papers, and articles provide info on ECG making, A/D conversion, signal processing, and general theory:

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