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Old 4th May 2004, 02:09 PM   #1
Stocker is offline Stocker  United States
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Default Resistor values

This is figure 3 from National's LB-44. I have two questions:

the precision 20k resistors: why?

and the 56R resistors: they are for current limiting yes? to determine their minimum value, I am thinking I need to figure in the amp's max output current, the portion of the load that each amp drives, and the voltage that's going to be developed across the load. Correct?

/edit maybe I should attach the image what?
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Old 4th May 2004, 02:22 PM   #2
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The 20k resistors set IC A3 at unity gain.
The value of the two resistors isn't that critical but the resistors must be matched.
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Old 4th May 2004, 02:26 PM   #3
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thank you.
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Old 4th May 2004, 03:10 PM   #4
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Quote:
Originally posted by Frank Berry
The value of the two resistors isn't that critical but the resistors must be matched.
It isn't necessary with matching, 5% will do, 1% is better. Even 10% is OK!
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