On Wed, 14 Mar 2007 07:30:52 -0700, Jim Thompson
wrote:
On Wed, 14 Mar 2007 11:53:54 GMT, "colin"
wrote:
"Winfield Hill" wrote in message
...
Eeyore wrote...
In response to various posts please find attached a mic amp
which has seen volume production in commercial equipment.
Feel free to ask any questions / criticise whatever.
Graham
Content-Type: image/jpeg; "mic amp.jpg"
It's nice to see the diff-pair currents going directly to
the output opamp, with it's 6.8k resistors. But why'd ya
steal away loop gain so aggressively by choosing 680-ohms?
--
Thanks,
- Win
Now theres no resistors, the diff voltage input to the op amp is always
zero,
so theres no diff voltage accross the 680r so they dont have an effect on
diff voltage.
Colin =^.^=
Sno-o-o-orkle! Does not!
...Jim Thompson
Not clear speech... Does not have any effect.
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
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| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
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I love to cook with wine. Sometimes I even put it in the food.