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Nov 06, 2017, 05:01 AM
Registered User

Need some help with a vtx

Hello guys,
My quadcopter is the Eachine Falcon 180 and its vtx died on my last crash, I would like to buy this one.
The problem is that the old vtx was connected to 12v as its voltage input was 7-24v, but the new one needs to be connected to 5v and I have no idea how to do it on the Falcon's pdb .
Also, my camera is connected to 5v.
I'll post some pics of the pdb so maybe someone can explain me how to wire this vtx.
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Nov 06, 2017, 08:37 AM
Registered User
You need to look up the specs for your PDB and find out what current the 5V regulator can put out. You need enough for everything running on 5V with plenty of margin.
Nov 07, 2017, 09:17 AM
Registered User
Sadly I can't find any information for that pdb, should I take another 12v vtx? What would happen if I don't have enough current?
Nov 07, 2017, 09:49 AM
Registered User
You do not want to overload the 5V regulator. If you do, you may lose control of the quad because the FC probably runs off of that regulator too. Most 5V regulators have enough current to run a VTX and Camera though. I myself would not use a board that I can't get specs and layout info on.
Nov 07, 2017, 06:27 PM
Staring at it won't fix it.
flyandride's Avatar
There are many others on Banggood that take a wide range of voltage input, such as these:
Nov 08, 2017, 04:11 AM
Registered User
I found this one, do you think it will be ok?
Nov 08, 2017, 08:27 AM
Staring at it won't fix it.
flyandride's Avatar
Originally Posted by Goodtime7
I found this one, do you think it will be ok?
That one would work. But you should consider getting one that is smartaudio capable, such as the TBS Unify Pro. Or there are some cheaper alternatives such as this one. There are others that have the capability, AKK makes some.
You haven't mentioned if you're flying with others or what radio you're using. With smartaudio you can change vtx power, band and channel from the on screed display or better yet, a menu on the FrSky Taranis. A wire from the vtx gets connected to a uart on the flight controller. Once you've had this capability you will never go back.
Nov 11, 2017, 03:27 AM
Registered User
Thanks for the advice, I will definetly upgrade with my next build.
But if I want to use the 5v vtx on this pdb I see that the only place where I can take 5v is the one that I marked (see image).
Will it work if I power it from there? Also, the gnd near the 5v is occupied by the ESC, is it ok if I use the same gnd for both ESC and VTX?

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