wirless audio transmitter & Reciver

[thannara123]

Hello experts i want to build an wireless audio transmitter and its receiver .
Please guide me ?
which frequency, use ?
the device might be more portable (small size & use less power).
Need minimum range 100meter .

The audio signal from a microphone.

thanks in advance.

 

[Jestin_cubetech]

option1: FM Transmitter and FM radio receiver.
option2: walkie talkie
http://www.qsl.net/va3iul/Homebrew_RF_Circuit_Design_Ideas/Homebrew_RF_Circuit_Design_Ideas.htm
**broken link removed**

**broken link removed**

 

[thannara123]

I am from India How can i purchase it ?