>"Alan B. Pearce" <A.B.Pearce@RL.AC.UK> wrote:
>> My only comment is that you do not need the resistor from the output to
>> the inverting input, just join the two together.
>
>In general, for critical applications (arguable in this case) you should
>have a feedback resistor that roughly matches the impedance connected to
>the other input -- this causes the voltage offsets introduced by the input
>bias currents to cancel out.

Oh sure. But in this instance, the resultant error would hardly be greater
than 1 bit on a 10 bit ADC - but then I have not worked through the math of
the input bias current of an LM324, I guess I am just too used to using CMOS
op-amps like the LMC6482. :))

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