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Old 26th May 2007, 10:57 PM   #1
diyAudio Member
Join Date: Mar 2006
Location: croatia
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

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Old 28th May 2007, 12:31 PM   #2
diyAudio Member
Join Date: Mar 2006
Location: croatia
Have any suggestions ?

I posted the same topic to the CHIP amp section so let moderator does what is necessary
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