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A wireless microphone is a microphone without a physical cable connecting it directly to the sound recording or amplifying equipment with which it is associated. Also known as a radio microphone, it has a small, battery-powered radio transmitter in the microphone body, which transmits the audio signal from the microphone by radio waves to a nearby receiver unit, which recovers the audio. The other audio equipment is connected to the receiver unit by cable. Wireless microphones are widely used in the entertainment industry, television broadcasting, and public speaking to allow public speakers, interviewers, performers, and entertainers to move about freely while using a microphone to amplify their voices.

There are many different standards, frequencies and transmission technologies used to replace the microphone's cable connection and make it into a wireless microphone. They can transmit, for example, in radio waves using UHF or VHF frequencies, FM, AM, or various digital modulation schemes. Some low cost (or specialist) models use infrared light. Infrared microphones require a direct line of sight between the microphone and the receiver, while costlier radio frequency models do not. (-wikipedia)

Once you have the Pi all set up, you’ll be able to amplify your voice with any all-in-one radio or boombox. This could be useful for giving lectures or presentations where it might be hard to hear you and there isn’t a professional PA system. You could also use it in a van or other large vehicle to communicate over the car’s speakers.

Here is the step-by-step instructions how raspberry pi can be used as a very good quality wireless microphone and can be used in class room, seminar, so keep reading.

Step 1: What You Needs...

Serial #ComponentQuantity
1Raspberry Pi (Any model, I used B)1
2USB Microphone1
3FM Receiver1
4Speaker with Amplifier1
59 Volt Battery +

5 Volt regulator (LM7805) or Power Bank

1
6

Raspberry Pi Case

1
7A SD card with Raspbian on it (minimum 2 GB)
1
8FM Antenna (simple jumper wire works fine)
1
<p>Would it be possible to plug in a jack-plug cable, so you can stream music from your phone to FM signals?<br><br>Here's the cable i have: https://www.amazon.com/3-5mm-Jack-Plug-Data-Cable/dp/B006T95XUS</p>
I am not sure but it should work. You can try with this.
<p>Okay, awesome! Thanks.</p>
<p>Do I have to use an amplifier or can I just use a simple radio ?</p>
<p>A simple radio, just make sure your radio has an FM functionability, most all radios do now.</p>
<p>Great project, i used this to create a portable radio station. So i can play music from my phone/ipod to fm signals.</p><p>Instead of a USB mic i used a USB soundcard(<a href="http://www.miniinthebox.com/nl/usb-2-0-virtueel-3d-audio-geluidskaart-5-1-kanaals-grijs_p259130.html?currency=EUR&litb_from=paid_adwords_shopping" rel="nofollow">http://www.miniinthebox.com/nl/usb-2-0-virtueel-3d...</a>) its not as loud as the mic, but it works.</p>
<p>Hi you know how one of the components is Speaker with Amplifier. What did you get (as in type of Speaker with Amplifier and is there a link to get it from) and how much was your total cost?</p>
<p>great ideas here... Thanks for posing this..</p>
<p>Very cool idea and so simple!</p>
<p>Thank you</p>
Plz send me FM wireless microphone
I'm big fan
<p>where to get this Board?</p>
Hello! It is available on most e-shopping websites. Just type in Raspberry Pi into any one, and you will find it. It is not the only one, though, for this type of purpose, so check other alternatives too (eg. Beaglebone black, banana pi, etc.). Hope it helps!
nixe work, what's the range u get with it?
<p>If you use 30 cm antenna you can get a range of 100 m.</p>
<p>Theoretical ideal length for a &quot;vertical&quot; antenna (as opposed to a balanced dipole) is 1/4 wavelength. At 100MHz or thereabouts, that's about 71cm. That sounds a little long for an FM mic - I imagine most manufacturers use the microphone wire as their antenna.</p><p>In most countries this is technically an illegal transmitter, BTW, but if you keep your power super-low and avoid interfering with commercial stations (who paid big money for their frequencies), you'll probably not be prosecuted. This is not legal advice :-p</p>

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