AD8232 heart monitor configuration circuit without electrical signal output

Hello Everyone,

I'm sorry if this question is repetitive, but I tried to find similar questions on the whole forum and couldn't find anything, so I decided to start a new thread.

I have designed in strict accordance with the heart monitor configuration circuit of AD8232 datasheet. The output  of the operational amplifier and  instrumentation amplifier only interference signal, the circuit does not have welding problems


Could anyone quickly point out where I might be going wrong?

Thanks!

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    •  Analog Employees 
    on Jun 19, 2014 10:33 PM

    Hi ssunny,

    The AD8232 is a very sensitive device so any noise can be picked up easily and amplified. You should first try to find out where the noise is getting picked up. You could first try applying a short circuit between LA, RA, and RL on the board and check whether the noise goes away. If that does not work, try putting the circuit in a shielded enclosure to shield from any possible environmental noise. You could use a metallic housing, or an easier solution would be to wrap a cardboard box in aluminum foil and connect it to ground. Also, please make sure that the board is thoroughly cleaned and that there is no residual flux on the board.

    Try to give those a try and let me know if it improves.

    Thanks,

    Kris

  • Hi Krisf

    After short connecting LA and RA, the output will be noise-free. May I ask what is the problem that makes the self-made AD8232 circuit work normally.

    Thanks!
    Kong Li

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