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Subject: Re: very basic opamp amplifier

Date: 06/24/02 at 11:16 AM
Posted by: Corry
E-mail: corry@unt.edu
Message Posted:

In Reply to: Re: very basic opamp amplifier posted by Jem on 06/24/02 at 12:26 AM:

The opamp is a lm324 there is no bias on this opamp.
The microphone is labtech mic which I normally have plugged into my computer. It connects via a stereo 3.5mm headphone jack. Tip is signal, middle is power, back is ground. I honestly have no idea of it's signal level, I just expect it to be low. The opamp can take anywhere from I believe 3 Volts, to 32 Volts of input power, but the specs are listed on the "spec sheet" i scanned in and have up on the site I listed. Trust me the opamp is getting ample power, I know that this is not the issue, I can here the small amount of fan noise from the AT power supply being amplified. But my signal is not.
Required gain, again I don't know, my guess is somewhere between 20 and 30 db but it may need as much as 50db gain. I am no EE, thats why I am posting here. This is more of a fun project. I know just enough about electronics to get me into trouble! ;) Please, check the website, I believe I have the thing wired to schematics for a non-inverting amplifier, but I could be making sume dumb mistake. I have tried 100's of web pages, each places capcitors of differing values in different places (my guess is to taylor the frequency response to their needs) I do not need this to be crystal clear though, a little noise won't bother me. This is not for any kind of professional thing. At this point I'd be glad just to have the opamp circuitry working properly.

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