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Old 9th July 2013, 12:17 PM   #31
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Originally Posted by Mooly View Post
A lot of these circuits are OK but not perhaps suitable for your needs. The ML3 circuit has balanced inputs for example which you probably don't want. You also probably need a dedicated separate mic preamp as I think I mentioned before. The first opamp stage can easily be changed to normal unbalanced mode and given more gain.

You need to read and study basic opamp theory and then you will understand how the gain and so on is set by the external resistors.
Thank you really so much Mooly!
This is a great help once again!

I had read about op-amps theory ( and used 741 and LM324 earlier) really long ago ( some 20 years ago or more I guess ) But after that I am totally cut off from electronics, math etc. due to a completely different professional life.

So now is the time for me to re-learn everything. And this time I have a great resource person like you beside me. So I feel fortunate and privileged being here

I will make a dedicated microphone circuit and read about the op-amps theory again after I finish the on going LM3886 tri-amping project and ask for help to you again if I get stuck.

Thank you once again.
Warm regards, Som

Last edited by csom; 9th July 2013 at 12:20 PM.
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Old 9th July 2013, 01:31 PM   #32
Mooly is offline Mooly  United Kingdom
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