How to replace mini microphone with more sensitive mic?

Hi

I am trying to replace mini microphone (is very similar to mobile phone microphone) of Audio bug with more sensitive Standard electret microphone with intention that it pickup sound from more than 1 metre distance, and in doing so I am getting too much noise in Audio bug out-put.

Do I need pre-amp? Is there any better way to do it? If pre-amp then how to harmonise out put of pre-amp to the input of audio bug?

Any help.....

Thank you.

Goodhart6 years ago
First off, you will need to make sure that the mic is "matched (impedance)" to the device you are putting it in. This is especially true if you add a preAmp.
ksaus (author)  Goodhart6 years ago
I am mesuring impedance(ohms), voltage, amp at preamp output end and input start of mobile microphone and publish here soon to get your help for how to match them...
ksaus (author) 6 years ago
Hi Goodhart, Thank you for your reply. In order to match impedance of output device(pre-amp) with input device (mobile phone mic input)

I have mesured current which is as follows.

Pre-amp out put is .0502 volts and 0.100 amp
Mobile mic input is 1.820 volts and 0.690 amp

In order to match impedance, I have attached 0.1 uF 25V green capicitor between positive of mobile input and one main output of pre-amp. Noice has reduce little bit but not completely ....

Can you please help further?

Regards