ultra low power mic preamp

SETEC_Astronomy · Post by **SETEC_Astronomy** » Sun Jan 06, 2008 11:18 pm

Can anyone suggest a simple, low parts count and low power mic preamp? I would prefer a design that doesn't invole an IC. I need this for a project that works but I have to speak to loudly for it to function correctly and would like to give the mic a bit of a boost so I can use the circuit with a normal level of speech. Any ideas?

Franklin97355 · Post by **Franklin97355** » Mon Jan 07, 2008 7:42 am

Would a transistor be acceptable?

SETEC_Astronomy · Post by **SETEC_Astronomy** » Mon Jan 07, 2008 2:30 pm

A transistor would be great. I forgot to mention this earlier and since it makes a difference my circuit has 5VDC available to power any solution.

sghioto · Post by **sghioto** » Mon Jan 07, 2008 5:43 pm

SETEC_ Astronomy,

This circuit will work. Just need to adjust Rb value as specified for best audio quality. Not a critical adjustment.

Steve G

SETEC_Astronomy · Post by **SETEC_Astronomy** » Wed Jan 09, 2008 3:47 am

Thanks it works great and has a current consumption of 670uA. Well done!

T&L Publications

ultra low power mic preamp

ultra low power mic preamp

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