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howto turn an fm transmitter to a mic?

 
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fastolfe
Newbie


Joined: 18 Jun 2009
Posts: 1
Location: Brussels

PostPosted: Thu Jun 18, 2009 9:14 am    Post subject: howto turn an fm transmitter to a mic? Reply with quote

Hello,
I don't know much about electronics but am trying to build a cheap wireless microphone to feed some data coming from a solar powered sound module to the computer. So I would like to connect the piezo sensor, which works as an amplifier for the sound module to an fm-transmitter.

An fm transmitter used for connecting mp3players to car radio could be a solution. So instead of a car radio I use a radio-CD set to receive RF from the transmitter. Then with an external sound card I feed the RF data from the radio to my computer.
Now am trying to connect the piezo to the fm transmitter. The fm-transmitter gadget has a stereo mini jack extension (see model here). Is there a way to connect it to a piezo sensor? Do I need to build a mini amplifier between the mini jack and the piezo?
here's a photo of the fm transmitter hardware


thanks
-f
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arachne007
HG Junior


Joined: 23 Sep 2010
Posts: 11

PostPosted: Fri Sep 24, 2010 3:23 am    Post subject: Reply with quote

I think the input of fm-transmitter should be audio signals so you should add simple converter and amplifier between piezo n fm transmiter. what piezo sensor do u use? there are many simple piezo microphone circuit out there
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