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Old 28th May 2007, 12:33 PM   #1
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Default AMPLIFIER ( MIC imput, HEADPHONES output)??

1)need mic sensitivity regulation
2) need volume regulation
3) has to work (the best way ) 1,5V if not possbile 3 V is ok

So have any ideas

I searched ST : they have special integrated amplifiers desgined for CELL phones and for headphones: I CAN NOT obtain them here so I ll have to do it with parts I can get

I can get TDA7231 and slimilar

ARE THERE any SINLGE element switching devices : 1,5V imput 3V output; I heared that sth like that exist right?

There are two imput designs: 1) amplifier amplifies ALL SOUND equaly acording to sound power
2) MORE SILENT sound are amplified higher than those loud ones

So can I use TDA7231 for output stage ande SIMPLE transistor amplifer for powering and amplifing ELECTRET MIC in those two ways changeable by switch for two way of operation in the same device


So can you suggest what integrated amplifier to use and if you have any ideas to post them

thanks
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Old 30th May 2007, 01:14 AM   #2
Leolabs is offline Leolabs  Malaysia
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Have you try National Semiconductors???Esp their Bommer Series.
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Old 30th May 2007, 04:30 AM   #3
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Quote:
Originally posted by Leolabs
Have you try National Semiconductors???Esp their Bommer Series.

I cant buy that here ..

I am trying to make circuit with components I can get here
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