Blogs

Turnigy 9c Transmitter Burned Up!!!

Posted by Russell B. Sutton on April 26, 2011 at 10:06pm
   As we all know the Turnigy 9c is a great radio for the $54 price @ Hobby King and is very user friendly. I want to warn everyone about acidently connecting the battery backwards, BE VERY CAREFUL if you connect the battery backward and turn on the Tx you will destroy it immediately. This Radio Tx does not have a fuse that can be replaced.

I had my radio 4 days.  I wanted to use a LiPo battery pack instead of the "AA" holder that came with it.  I some how managed to reverse the polarity and blew the CJ78L05 voltage regulators to peaces.  The wiring on the main processor board even melted and smoked.  So now after salvaging the switches, potentiometers and LCD display, my brand new Turnigy 9c Tx radio is in the trash and the quadcopter just sits there lifelessly waiting............. So during the next month or longer while I wait for the 2nd new Turingy 9c radio I'm gonna figure out how to incorporate a fuse into the new transmitter so that this never happens again.  Sorry no pics!!!  

E-mail me when people leave their comments –
Follow

You need to be a member of diydrones to add comments!

Join diydrones

Comments

  • Jack Crossfire April 27, 2011 at 8:57pm
    Throw in some XBees & make your own transmitter.
  • Russell B. Sutton April 27, 2011 at 12:07pm

    @ Darren    Thanks bro!!  But it's toasted I've spent 2 days repairing it's SMOKED,  Just when i thought i had it fixed It smoked again,  So it's finished,  It was kindda tricky replacing all the surface mounted regulators.

    @ I.S.  I can believe it either but it's true,  It's makes them more money if u burn it up....  :o(

  • Russell B. Sutton April 27, 2011 at 12:00pm

    @ AR, I soldered the connector from the "AA" pack holder to a balance port extion connector,  I was planning on using my older LiPo batteries witch are wired different from my new LiPo's,  The grounds are swapped on the Balance connectors.  When I went to test it out I tried the new battery instead of older ones.  Simple but deadly mistake.

     

  • Darren April 27, 2011 at 8:53am
    I did that too, but was able to repair it easily. Email me if you want details. Dhcorley@msn.com
  • I.S. April 27, 2011 at 5:57am

    Can't believe It has not any kind of polarity reversing protection, but at 59USD I can't complain.

    A diode will do the job, (even help the reg.), or maybe some other little more sophisticated solution as a PTC.

  • Ante Vukorepa April 27, 2011 at 5:13am
    Apart from soldering the connector to the battery the wrong way around, i honestly don't see a way to connect it to the transmitter in a way that would fry it.
  • ARHEXA April 27, 2011 at 4:56am

    well a fuse couldn't make things worse,

    but it couldn't save you. if it takes 200ma "only" to burn the chip with reverse polarity, your fuse won't blow, but the chip will be fried.

    a diode will protect you from reverse polarity, just put it in the transmitter and not on every battery :)

    actually the best would be to use a polarized connector that won't allow you to connect it in reverse.

    this will save you power because the diode has a small voltage drop.

    the transmitter connector has a 3 way connector with positive in the middle, this should be quite safe,

    what did you do to connect it in reverse ?

  • Russell B. Sutton April 27, 2011 at 1:10am

    could i put the diode where the battery connects so that all curcuits will be protected? what about a .315 amp fuse? 

  • ARHEXA April 27, 2011 at 12:24am

    sorry for you mate,

     

    but this gives an idea:

    if the transmitter uses the 7805,

    it could be replaced by a switching DC-DC converter, more efficient. to save lots of battery !

    just add a diode on the input of the converter (or even if you keep the 7805) and you're protected forever.

    better go without the diode, but because you have 12v and you regulate it to 5v, the diode voltage drop isn't too bad....

This reply was deleted.