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Old 15th January 2002, 02:00 AM   #11
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wuffwaff.... you'd be best to use the circuit that sonnya has posted as it will be the most reliable and cause the least number of problems. It will also meet your criteria of 2 opamps in each signal path.
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Old 15th January 2002, 03:10 PM   #12
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Default balanced output

Why don't you use an instrumentation amplifier, like AD makes !

grtz

ST
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Old 15th January 2002, 09:10 PM   #13
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wich AD or BB instrumentation amps are you refering to?

william
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Old 15th January 2002, 11:02 PM   #14
sonnya is offline sonnya  Denmark
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Hi William

May i suggest DRV134/DRV135 from BB/TI (same company!) They are enhanced dropin replacement for SSM2142 from AD.

DRV134 and DRV135 are identical devices in different housing. DRV135 is in a SO8 house where it can't dissipate as much heat as the DRV134 ... Long cables or a load smaller than 600Ohm => DRV134



Sonny
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Old 16th January 2002, 06:54 AM   #15
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Hi William,

Types i do not know. I think i stick with the types Sonny suggested.
Most important is that the opamps inside are matched due to the fact that they are made on 1 piece of silicon. Perfect temperature and etc.... matching.


grtz

Simon
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