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    Differences in terms of programming for PIC16F84 and PIC16F84A

    is there any difference in term of programming for PIC16F84 and PIC16F84A ? or both are compatible with each other using same programming source? yes, i know its old and obsolete. =_="
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    need explanation about amplifier and filter

    explanation of amplifier hi , can anyone explain this circuit to me ? what type of amplifier it use ? and the filter and such. how to do a hand analysis of the circuit. https://www.web-ee.com/Schematics/HeMon/Schematic.pdf thanks.
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    optical heart-rate sensor

    help needed , i'm a beginner in designing the schematics. can someone look at the circuit , and help me. this is the design. this is the schematic i made T_T is my design correct? when i stimulate , it says something about Pin VEE not modelled for U2. what does it means ? help anybody...
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    optical heart rate monitor design

    hi , is there any good design out there to use , to make the heart rate monitor using optical sensor, something called PPG (Photoplethysmogram) thnks
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    Help me build an ECG and PPG

    hi , i need to build an ECG using 2 metal electrode to detect heart rate by placing thumbs and index finger on the metal electrodes. any help and schematics ? thanks. oh and yeah , i also wan to moniter heart rate also using PPG from index fingers. thanks again Added after 4 hours 23 minutes...
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    electrocardiogram and photoplethysmogram from finger(s)

    design photoplethysmogram hi i'm new here i dunno how to start , but i'm a student in the middle one doing a project to design an ECG and PPG circuit to monitor heart rate from finger, is there any suggestion/opinion/advise or design for this project for me? thanks.

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