>His original circuit is in the context of an ECG amplifier.
>It seems very unlikel;y that any 1/20th of a Hz components
>would be significant there.

It is significant, in that you need to limit the DC response to minimise the
muscle artefact offsets you see in the signal, but you also need to have a
close to DC response to get the required heartbeat signal, and see problems
with it.

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