piclist 2001\02\18\202139a >
Thread: magnetic coil input to PIC
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.

Dave's Engineering Page: http://www.dvanhorn.org
Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9

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In reply to: <3A907191.3ED209F7@idcomm.com>
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Subject (change) magnetic coil input to PIC

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