Hello guest, if you read this it means you are not registered. Click here to register in a few simple steps, you will enjoy all features of our Forum.
This forum uses cookies
This forum makes use of cookies to store your login information if you are registered, and your last visit if you are not. Cookies are small text documents stored on your computer; the cookies set by this forum can only be used on this website and pose no security risk. Cookies on this forum also track the specific topics you have read and when you last read them. Please confirm whether you accept or reject these cookies being set.

A cookie will be stored in your browser regardless of choice to prevent you being asked this question again. You will be able to change your cookie settings at any time using the link in the footer.

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Clean Pololu Step-up to FX758-2
#1
While building my microquad, I came up with a way to reduce wire clutter when connecting the Pololu 5V step-up regulator (U3V12F5) to the FX758-2  VTx.

First, take the three-pin connector that was included, and push the plastic casing toward the short end slightly:

[Image: B2M6iD9FORA3qraXX-LsvMEj4xPy_I7QKuNWpgLI...40-h979-no]

Next, solder the long pins on the component side of the board:

[Image: hsDmpyIPYlMA1YUZZ0JeAr_m8vvHYzy-jM6p685A...40-h979-no]

Now, clip the short pin on VIN flush with the spacer:

[Image: Hoku1xGfbzqPK7FcEKSmZFXKK8ojX-gsa-6wf9Vs...40-h979-no]

The two remaining short pins can be soldered directly to +5V and GND  on the FX758-2, with the spacer providing space for the regulator to clear the metal can on the VTx. I don't have a clean photo of that step alone, but here it is with the camera soldered to the VTx:

[Image: tDfnlQcCcyTLUvmi4IzNZlDHuACIoH8arMO8IM2q...40-h979-no]

Now you can leave the long VOUT pin in place and use a servo plug to attach to battery and camera, or you clip it off and solder the camera to the top (which is what I did):

[Image: lqTp3ccflvs2AlxPiSUcV-SIWNQfTKkY9lzlvT8E...40-h979-no]

I ended up bending the two remaining leads to about a 45 degree angle to work for my setup:

[Image: nEkubDGuxLpDW53mOgt2XZqjVQ-PU6y6LRg2jpAU...40-h979-no]    [Image: lOPtS0k8r5rMR-Rf2eYfmL7UszJkIPrqs5CHXdnR...40-h979-no]

Depending on your setup, you might be able to use a right-angle connector in similar manner.
Good luck,
Scotty
Reply
Login to remove this ad | Register Here
#2
Very neat Scotty, great idea.
My youtube channel

Reply
#3
(23-Apr-2016, 01:55 PM)BigglesFPV Wrote: Very neat Scotty, great idea.

Thanks!  It still leaves room for the mini dip switch that people usually add to this VTx.  I'll probably add one to this eventually (right now it's just single channel).
Reply
#4
Interesting thanks for sharing!
is the step-up regulator working fine? how is the noise with your FPV setup when flying?
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
Reply
#5
(27-Apr-2016, 01:35 AM)Oscar Wrote: Interesting thanks for sharing!
is the step-up regulator working fine? how is the noise with your FPV setup when flying?

Regulator appears to be working OK.  I had a bit of reddish tint in the video, but the noise level is fine (haven't flown it very far away yet though).  I have since shortened the wires to the camera (and did a better job soldering this time  Smile ), but I haven't tested it yet.

I didn't mention it above, but if you look at the first picture, you can see a small exposed ground pad near VOUT. It shouldn't matter (since the can is ground), but I put a small piece of electrical tape over it anyway to prevent any chance of it contacting the can.
Reply
#6
(27-Apr-2016, 10:07 AM)sloscotty Wrote: Regulator appears to be working OK.  I had a bit of reddish tint in the video, but the noise level is fine (haven't flown it very far away yet though).  I have since shortened the wires to the camera (and did a better job soldering this time  Smile ), but I haven't tested it yet.

I didn't mention it above, but if you look at the first picture, you can see a small exposed ground pad near VOUT. It shouldn't matter (since the can is ground), but I put a small piece of electrical tape over it anyway to prevent any chance of it contacting the can.

nice, using the "can" as ground, very convenient and wire free indeed!
Another thing I am wondering is the output voltage of the regulator, does it hold it at 5V when you start to discharge your lipo?

sorry for all the questions, it's just interesting !
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
Reply
#7
(27-Apr-2016, 11:47 AM)Oscar Wrote: nice, using the "can" as ground, very convenient and wire free indeed!
Another thing I am wondering is the output voltage of the regulator, does it hold it at 5V when you start to discharge your lipo?

sorry for all the questions, it's just interesting !

It's supposed to hold 5V out with input as low as 2.5V.  The specs say "output accurate within 4%".  I'm not sure I'd know how to check it, but I haven't noticed any difference between the beginning of a flight and the end of a flight.  (However, my flights with FPV have only been around 3 minutes... Smile )
Reply
#8
Excellent idea, will use it on my next build.
Thanks for posting.
Reply
#9
very nice
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  How to clean drone motors mattyfleischfpv 4 812 26-Jan-2024, 01:25 PM
Last Post: mattyfleischfpv
  Goggles Clean DVR install on Quanum Goggles KonradS 25 7,649 21-Jan-2017, 12:43 AM
Last Post: Drone0fPrey


Login to remove this ad | Register Here