FM Transmitter


hamster
  • Hamster makes an awesome FM transmitter using just the Papilio and a length of wire!

So I've just finished my latest project - an FPGA based FM transmitter that beeps out SOS in Morse code. All you need is a wire and 60 lines of VHDL!

http://hamsterworks....ndex.php/FM_SOS

Fm_xmit.png

I was musing over it all day and decided to give it a try.

There I was feeling extra clever at how well it works, and upload the a video of it in operation to Youtube. As soon as it finished it recommends that I might want to watch another video - it is somebody transmitting music on FM using only an FPGA. I don't feel so clever now!

Original forum thread.



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User Feedback


Good evening Mr Hamster :)
The project is very interesting. I am a student and if u Could you help me?. I want to send audio. You said, audio with 16-bit resolution high quality mono. 1221381325 + / - 1.000.000

but I don´t understood very well that I add audio input in the process.,and what signal I  use.
 

This would be:

if beep_counter(19) = '1' then
               phase_accumulator <= phase_accumulator + 1222381325;
            else
               phase_accumulator <= phase_accumulator + 1220381325;
            end if;
         else
            phase_accumulator <= phase_accumulator + 1221381325; -- +/-1000000
         end if;

This is my email: rafael_u_r@hotmail.es

my fpga is DE2-115 Cyclone IV and the audio codec is WM8731:

Audio Codec, Signal name:

  

AUD_ADCLRCK

 

 

PIN_C2

 

 

Audio CODEC ADC LR Clock

 

 

3.3V

 

 

AUD_ADCDAT

 

 

PIN_D2

 

 

Audio CODEC ADC Data

 

 

3.3V

 

 

AUD_DACLRCK

 

 

PIN_E3

 

 

Audio CODEC DAC LR Clock

 

 

3.3V

 

 

AUD_DACDAT

 

 

PIN_D1

 

 

Audio CODEC DAC Data

 

 

3.3V

 

 

AUD_XCK

 

 

PIN_E1

 

 

Audio CODEC Chip Clock

 

 

3.3V

 

 

AUD_BCLK

 

 

PIN_F2

 

 

Audio CODEC Bit-Stream Clock

 

 

3.3V

 

 

I2C_SCLK

 

 

PIN_B7

 

 

I2CClock

 

 

3.3V

 

 

I2C_SDAT

 

 

PIN_A8

 

 

I2CData

 

 

3.3V

 

 

 

My apologies if I ask too much, but it's a project, I'm doing at my university.

I look forward to hearing from you soon.

Yours sincerely

 

Rafael Urquizo from Peru.

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