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Subject: Re: help needed with intercom circuit

Date: 10/22/00 at 9:16 PM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org
Message Posted:

In Reply to: help needed with intercom circuit posted by Seamus O'Donnell on 10/22/00 at 6:52 PM:

Hello, Seamus.

The LM386 data sheet at http://www.national.com/ds/LM/LM386.pdf shows only using the device with an 8 ohm load, so trying to drive two 8 ohm speakers is probably not a good thing. You might want to consider the LM4873 at http://www.national.com/ds/LM/LM4873.pdf instead.

A user hearing his own voice is called a "sidetone" and can easily be done by feeding a sample of the user's spoken audio back to his own headphones.

Good luck.

John Dunn - President
Ambertec, Inc.
ambertec@ieee.org


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