On Wed, 14 Mar 2007 10:38:22 +0000, 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

Operating within 0.7V of the common-mode voltage spec troubles me.

I'd bump up those 680 ohm resistors to say 2.2K, making the
common-mode operating point approximately -7V.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.