Comment by ARHEXA on 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....

Comment by Russell B. Sutton on 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? 

Comment by ARHEXA on 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 ?

Comment by Ante Vukorepa on 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.

Comment by I.S. on 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.

Comment by Darren on 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

Comment by Russell B. Sutton on 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.

 

Comment by Russell B. Sutton on 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(

Comment by Jack Crossfire on April 27, 2011 at 8:57pm

Throw in some XBees & make your own transmitter.

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