Question about powering video tx - HeliFreak
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Old 11-01-2012, 01:14 PM   #1 (permalink)
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Join Date: Nov 2008
Location: Montreal
Default Question about powering video tx

Hi,

I just finish building a quad and done a few flights with it and I love it, now I also ordered some FPV goggle and a camera with video tx/rx.

I run 4s lipo on my quad, and now I just read in the video tx spec that it need a 12v input, I want to know what others do to 4s setup with 12v video tx... not sure whats best.

Some solutions I though about are:

1) add a 3s lipo for video tx only, downside is that it will add some unneeded weight to the quad (only 3s I have are 2200mah from my trex450)

2) get a LM7812 voltage regulator transistor at the electronic shop and install it to get a cheap step-down 12v voltage regulator for powering the video tx

not sure if there is other options available, waiting for suggestions
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Old 11-01-2012, 07:00 PM   #2 (permalink)
 
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Get a very small battery (400-900mah depending on video time you want). A 7812 only shells out 1A which might be a problem with powerful video transmitters...
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Old 11-01-2012, 10:40 PM   #3 (permalink)
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hey mate, i'll be running 4s soon also, just waiting for this:

http://www.ebay.com.au/itm/130783481...ht_2445wt_1163

It'll supply clean power to your tx, and you can adjust it to suit your power needs. Much lighter than another battery
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Old 11-01-2012, 11:37 PM   #4 (permalink)
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Quote:
Originally Posted by jolyboy View Post
hey mate, i'll be running 4s soon also, just waiting for this:

http://www.ebay.com.au/itm/130783481...ht_2445wt_1163

It'll supply clean power to your tx, and you can adjust it to suit your power needs. Much lighter than another battery
Great find, I also like this better than having another battery on board, one less battery to charge and keep track of and much lighter...

I've just ordered one, thanks to you

Hopefully it'll get here around the same time as my fpv gear
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