[volt-nuts] Help with 7081 AC buffer circuit

David C. Partridge david.partridge at perdrix.co.uk
Fri Jun 8 20:22:46 UTC 2012


Mitch, I don't think that's likely to be the problem, if it were, all the 7081s and 7071s would have a huge problem, but they don't, just this one ... 


Regards,
David Partridge
-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On Behalf Of Mitch Van Ochten
Sent: 08 June 2012 20:49
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Help with 7081 AC buffer circuit

David,

Try enclosing the op-amp and nearby components with a little Styrofoam "hat".  The part dissipates a fair amount of power and the bias current, although small, does show significant change with temperature.  This change multiplied by the 1 megohm input resistor may be responsible for some drift.


Regards,

mitch





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