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Subject: Re: very basic opamp amplifier

Date: 06/24/02 at 12:26 AM
Posted by: Jem
E-mail: Jemidar@hotmail.com
Message Posted:

In Reply to: very basic opamp amplifier posted by Corry Lazarowitz on 06/23/02 at 3:14 AM:

A few clarifications:

1. Specify the OPAMP used.
2. Specify the type of mic used (or expected input signal level), and its output impedance.
3. Specify the required gain.

Some suggestions:

1. The AT power supply generally supplies +12V (among other output voltags). You cannot use a linear (I assume) 12V regulator with +12V input. The regulator requires an input of at least +15VDC in order to regulate down to +12 (even LDO's require more than +12V input).

2. If you are using an opamp with single supply, you should bias one of the inputs with a resistive divider such that the output is sitting a about half Vcc (around 6V) for maximum dynamic range, and then AC couple both input and output.

Hope that helps,


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