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scarebyte 4th September 2012 06:01 PM

Impedance matching using lm324
 
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Hi,

I have an intercommunicator, that have an speaker/mic. I want to connect it in parallel and using an comutator, to a mic and speaker. For impedance fix I'm using an op-amp(lm324) in buffer configuration. I get notorious distortion, so I'm using a 6.8kohm connected to ground and out, that is ok?. The mic have 500ohm rate impedance output. The connections in the figure are ok?, how can improve?

Thanks.
Regards.

donpetru 4th September 2012 07:10 PM

Is not quite correct, because the resistance of 6.8K will change output impedance.

scarebyte 4th September 2012 08:11 PM

Quote:

Originally Posted by donpetru (Post 3152107)
Is not quite correct, because the resistance of 6.8K will change output impedance.

Ok, so what could be a good configuration?. And which opamp use if my supply voltage is 32Vdc?

Thanks.

grommeteer 4th September 2012 09:28 PM

To be honest I do not quite understand what you are doing.
You cannot drive a speaker with the LM324 because it can sink and source too little current. You cannot amplify an AC signal with a single supply Opamp without a DC offset. The fact that the LM324 is a very poor audio amplifier will probably be your least problem. Why not make a more detailed/exact schematic? Then we can discuss in detail.


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