Battery Powered Microphone Preamp - Unusual Application

mrevie · 21st July 2009, 12:19 AM

Hi all,

A friend of mine is constructing a wireless electronic stethoscope. The plan is to use a microphone capsule within a short length of sealed tube leading to the stethoscope diaphragm and then transmit the sound via bluetooth to a set of wireless headphones. So far, everything is working perfectly, but the sound is much to quiet.

As is he has be microphone plugged directly into a headphone amp which then sends to a bluetooth transmitter and on to the headphones - I believe the issue to be the lack of a microphone preamp.

Does anyone have any suggestions for the purchase or construction of a compact, battery powered microphone preamp?

mrevie · 21st July 2009, 01:37 AM

Ah, I should have done a bit more searching before I posted. Rod Eliott is my saviour for the nth time. He has at least two projects with PCBs that would fit the requirements.

21st July 2009, 12:19 AM	#1
mrevie diyAudio Member Join Date: Jan 2009	Battery Powered Microphone Preamp - Unusual Application Hi all, A friend of mine is constructing a wireless electronic stethoscope. The plan is to use a microphone capsule within a short length of sealed tube leading to the stethoscope diaphragm and then transmit the sound via bluetooth to a set of wireless headphones. So far, everything is working perfectly, but the sound is much to quiet. As is he has be microphone plugged directly into a headphone amp which then sends to a bluetooth transmitter and on to the headphones - I believe the issue to be the lack of a microphone preamp. Does anyone have any suggestions for the purchase or construction of a compact, battery powered microphone preamp?

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21st July 2009, 01:37 AM	#2
mrevie diyAudio Member Join Date: Jan 2009	Ah, I should have done a bit more searching before I posted. Rod Eliott is my saviour for the nth time. He has at least two projects with PCBs that would fit the requirements.

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