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Subject: Re: Parallel op amps

Date: 02/03/03 at 10:59 PM
Posted by: Rich
E-mail: abbott@ligo.caltech.edu
Message Posted:

In Reply to: Parallel op amps posted by Russ Kincaid on 12/23/02 at 12:07 PM:

Hi Russ, sometimes it is desireable to parallel the outputs of op-amps, but only when a small series resistance is added to each op-amp output. The main reason to do this is to lower the noise of exceptionally low noise parts slightly further. You gain as the root sum of the square of the number of op-amps.

For boosting the output current if you are set on using the LM324, try a general purpose transistor within the feedback of the op-amp. There is a note in "Horowitz and Hill's Art of Electronics" in case you are interested. For me, I would choose a more powerful op-amp, which there are many depending on how much current you want. For an example, see the LM-12 which is a brute. Good luck, Rich.

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