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Thread: magnetic coil input to PIC
www.piclist.com/techref/microchip/ios.htm?key=input
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face BY : David VanHorn email (remove spam text)



>
>Do remember that whatever scheme you use, the low frequency bandwidth is
>better with a low impedance input. Having the pickup coil looking into the
>virtual ground input of an opamp is ideal, bandwith wise.

It kills self-resonance (by murdering the Q, usually a good thing) and
converts the op-amp from a voltage to a current amplifier.
Also, usually a good thing.


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<4.3.2.7.2.20010218200452.00e0ec00@mail.cedar.net>

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