Hacked Gadgets Forum

March 24, 2007

DIY FM Transmitter

at 5:00 am. Filed under Cool Gadgets, DIY Hacks, Electronic Hacks

Here is a nice and simple FM transmitter from David at Volunteer Lab Rat that will let you blast your iPod tunes on your stereo. Full details are provided on the site.

“You know these smart FM transmitters you can use to stream music from your iPod into your car stereo? Here’s a nice little project that I’ve made and that you can build yourself for around 5$. It’s my homebuilt FM transmitter that I use for streaming music into my car stereo and the old-school stereo at the metal workshop at my university! The awesome thing is that the transmitter is based on only one transistor, and is really simple to construct.”


 

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25 Responses to “DIY FM Transmitter”

  1. rol3ert Says:

    Haha! nice use of what looks to be a microchip sample box 😉 …still hate ipods though

  2. NGinuity Says:

    Very neat. It looks like you have built a single frequency voltage controlled oscillator. I like it!

  3. David from volunteer lab rat Says:

    Hi Rol3ert!

    You’re absolutely right, it is a microchip sample box in which i recieved 2 PIC processors for making a 4-axis CNC controller.

    NGinuity, Good guessed, thanks for the kind words

  4. BronzeG3 Says:

    I thought I would be the first to guess it was a microchip box. oh well. Very nice project.

  5. NGinuity Says:

    David,
    Do you have a link to your CNC controller? That is something I am into as well.

  6. Jaren Says:

    Solemn article. It make me lost in thoughts.

  7. David from volunteer lab rat Says:

    Hi NGinuity!

    I’m still working on it! I’m building a 3 axis CNC milling machine ans a 4 axis CNC controller board. I can give you some specs on it though:

    Parallel port based
    4 axis control
    Manual mode with axis control through 4 rotaty encoders/jog wheels
    LCD display to show machine coordinates and to set up the controller
    Capable of handling 24A to feed the motors.

    The progress on the milling machine so far can be seen here:

    http://www.volunteerlabrat.com/cnc.jpg

    When it’s all done, I’ll try to get it posted on hackedgadgets.

    Best regards
    David

  8. NGinuity Says:

    Hey David. I have an email coming to you. Stand by 🙂

  9. Lee Meols Says:

    Ive just brought a 175.000mhz Microphone system with 2 Microphones one of the microphones sadly has seen better days but what i did was is use the insides to create a Audio Transmitter and being legal as its got an exempt frequency ive adapted it and remove the microphone part and soldered a Phono connection to it plugged it in my laptop and hey presto it works.. 🙂

    Regards..
    Lee

  10. Clark Hummell Says:

    Man! I just payed $20 for one at RaidoShack!

  11. Ric S Says:

    hey, nice. Im new at these electronic stuff. Hope you can help me out, I recently bought Scosche IPTRNSX FM transmitter, and was looking for help to modify it since I cant find the antenna. Any help will be great, Email: Reigntrs8@gmail.com

  12. Wolfin Says:

    Good! All it needs now is a power input to sap the iPod’s instead of draining a 9volt. And maybe an antenna, which is easy enough.

  13. imran Says:

    I am decent with elecrtonics, can solder, etc.
    But i dont understand which parts to get and what the abbreviations, such as “C4 C5” etc are
    And i am guessing the are capacitors?
    But is there a specific type of (Capacitors, transistors, ets) i need to get?

  14. Alan Parekh Says:

    Hi Imran,

    Click on the link above, then click on the image on the project page to open the project zip file. One of the PDF images within there have component values listed. Yes C indicates a capacitor and R indicates a resistor.

  15. imran Says:

    Well
    Im not finding it
    I have 2 pdfs i can use
    1 is fmtrans_withparts
    and other is fmtrans_noparts or something
    then there are 2 under mac folder that i cannot open
    Thanks for help so far, and thanks for anymore help yo can give

  16. Alan Parekh Says:

    Have a look at the one that is listed with parts. Beside each component the value of the part is listed.

  17. eletec Says:

    NEW FM TRANSMITTER FROM 20W TO 60W FROM ELETEC FRANCE

  18. John S. Says:

    Hello,

    I looked at your FM Transmitter and I was interested in making my own as well. But I needed the schematic for it so I can make one. I was wondering if you had the schematic to your FM Transmitter above and if you did I was wondering if you could upload that on to your site or better yet email it to me. That would be awesome. Thanks!!!! Hope to her from you soon!

  19. Alan Parekh Says:

    Hi John,

    Please see the project site.
    http://www.volunteerlabrat.com/default.html?goto=fmtrans.html

  20. John S. Says:

    Hello,

    I have looked at the project site, but it is difficult to understand the PCB layout that you have uploaded on the project website. So I was wondering if there was a simpler schematic that you might have that I can look at that is not on a PCB layout or anything like that, but maybe hand drawn or drawn using computer software like PSPICE or Electronic Workbench or something like that. Please let me know.

    Thank You.

  21. John S. Says:

    Hello,

    I was wondering if you would be able to explain the circuit to me briefly. For example, why did u choose the values you chose for the resistors and capacitors and etc and what some of the parts of the circuit do. I know that the trim capacitor is able to determine what frequency the transmission occurs at and you can change that frequency by changing the value of the trim capacitor but can you explain some of the other parts to me. That would be great if you can.

    Thank you very much. Hope to hear from you soon.

    John S.

  22. EllisGL Says:

    The 99 cent only store near me has a iRiver FM transmitters. I picked up 5. One of these day’s I’ll tear them apart and do something awesome that includes integrating USB stuff to it.

  23. Alan Parekh Says:

    It’s cool what you can get for a dollar sometimes. Let us know how the project turns out!

  24. Ante N Says:

    Hi there…

    Built your fm transmitter on a “labwafer”, the kind you solder on, so I have changed the physical positions of the components to get the “wiering” correct. My broblem is that it wont work. I have moved the Trim capacitor from the wafer via leads so it wont be distubed by other components. I only had 1mm copper wire for the coil so I wound it an extra turn. I also skipped the LED and resistor for the LED and only made one channel input. They where out of 7806 so I bought a 7805 instead and connected it via a diod to GND to get an extra 0.68 V out of it, so the voltage is 5.68v instead of 6v. The antenna is made of 75cm of standard 1.5 mm2 cable. Could the lower voltage be the couse of the broblem? or the incorrect inducance in the coil. Do you have any ideas..
    Unfortunatly I dont own a oscilloscope so I cant debug correctly. All I have is a digital multimeter. How much battering can the BC337 handel conncted it the wrong way the firs test…. And the trim cap has been turned like 10^9-times…and im not sure what value range it is.. Its red.. no markings.. I said I wanted a trim that was to your specifications.
    Any ideas on what to look for??

    Forever greatful for any feedback.
    Thnx in advance.

  25. Justin Says:

    so how do you make?!?!?!?!?! im very interested!
    also whats the parts list and can you provide me with a diagram that shows whats what and how its wired???

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