OpAmp - easy question

May 29, 2004 1 Replies
M

Hey--


9V is a weird voltage in a lot of projects. We used OpAmps in an entry-level EE course where we had access to bench power supplies and could dial in 9V.

Now I'm working at home, and the project that I am designing will have an AC adapter which will provide 12V and 5V to the board. I'm wondering, can I provide the OpAmp (probably an LM7414) with 9V by using a simple voltage divider circuit? Or does the OpAmp have an internal resistance thats significant, and if so, is it constant or variable?



Thanks in advance


|\/| /| |2 |< mehaase(at)sas(dot)upenn(dot)edu
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J

Most OpAmps are (nearly) constant current, as far as quiescent current is concerned. I'd just use the +12V supply for the OpAmps.

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
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