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Electret microphone amp circuit ?

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tron87

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Looking for a simple electret microphone amp circuit that can drive a 8 ohm speaker and the output be loud enough to hear 5 meter away ?

Ive got these op amp hanging around will they be any good or too weak ?
lm2904
lm324
741
ts27l2c


If the second question is no then please suggest a transistor amp version ?


thx
 
LM386 as the preamp and audio power amp. **broken link removed** to see how to set the gain of the LM386 to the higher gain which will be required to amplify the rather puny output of the electret. You will also have to "bias" the electret to get it to work (which the 386 doesn't do for you).
 
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I think you will have acoustic feedback howling because the microphone will hear the speaker and the sound will go around and around.
Turn down the volume control and point the mic and speaker in opposite directions fairly far apart (or in separate rooms) to avoid the feedback.
Then talk loudly very close to the mic.
 
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