Home-made UBEC

[RC-Monster Mike]

I had the same thought on the amp draw, so I figured I would give it a whirl and see what happens.

Hey Travis, you get anywhere on this? At the very least, I'd like to know of a link for the electronics to make another regulator, don't think it'd be that hard.

[MetalMan]

It is made, and it also has a 4s Lipo regulator on the same circuit board. But since I don't have a controller to use, my testing only get as far as using a variable voltage power supply to see where the cutoff device would cut off. I also saw that a BMS-620mg can pull more than an amp easily! The cool thing about this regulator is that when the amp draw goes up, the voltage does also! It is rated at 5volts, but under enough amps it went up to about 5.30v.

I got two Warriors (9918 and 9920) that'd be willing to test it......and I need one for the 9920 anyway. ;)

[MetalMan]

To start out, here is the datasheet:
http://www.jameco.com/wcsstore/Jamec.../310391NSC.pdf

See if you can make any sense of what to do before I intervene :).

Okay, way too many words and junk, all I needed were the diagrams on pages 28 and 29. So does that stuff come in a kit, or are they just showing you how to make one? Either would be easy enough, I'd just bust out the 20 watt Weller and attack it somehow......:D

[Dafni]

Originally posted by dabid
I got two Warriors (9918 and 9920) that'd be willing to test it......and I need one for the 9920 anyway. ;)

Dabid, are you aware that those ESCs are perfectly identical? Just the sticker is different. And at some point BK decided to go dual wire on their products.

You're right, they are identical, with the exact same number of wires and everything......no joke.

[MetalMan]

No kit. This is the fun part! You are lucky I already found a inductor (coil) that will work! It took me about an hour to find.

You should look at the diagram on page 13 to see what parts you need.

I will get a list together later of the parts you need. But I will add that this regulator isn't small. The capacitors and inductor are large in diameterand the diode is big.

[Serum]

What would it cost to build MetalMan?

How big is "big"? I know the one I had you make for me was fairly small, would this one be larger because it's better and has more complex components?

[MetalMan]

Originally posted by Serum
What would it cost to build MetalMan?

Once I get the list of parts together, I can tell you. It's not that expensive, though.

Originally posted by dabid
How big is "big"? I know the one I had you make for me was fairly small, would this one be larger because it's better and has more complex components?

It's about 2 1/4" x 1 1/4" x 0.5" (thick). This is excluding the capacitor that is external (to reduce the size). The one I made for you was small, just 2 3-pin regulators, 2 small capacitors, and a small diode. That one is rated at 2amps and 6v, but only ~60-70% efficiency (depending on input voltage), whereas this switching one's efficiency is ~85-90% on 15v (but it gets higher as input voltage increases), and is rated at 3amps and 5volts.

I am working on the parts list, and it will soon be here.

[MetalMan]

Okay, here we go. These are the best parts that I found from before after numerous hours of searching.

-Regulator - "Simple Switcher" 5v 3amp
-Inductor - 47uH, 3amps

-Input capacitor (probably overrated, but the bigger, the better) - 50V 470uF
-Output capacitor - 16v 330uF
-Diode - 40v 5amp
Cost not inluding shipping/handling for these parts:
$7.56. Not too expensive! But then you will have to add ~$15 more for shipping/handling. I realize that it isn't very conveniant to order from 2 different sites, but they are just where I found the optimal parts.

These are not the only options for parts, as one could choose smaller (in size) parts that would work, but I tend to like to be conservative when it comes to these things.

Wow, okay.......so would this be a better purchase than another regulator like the last one you made for me? Also, where would you get the circuit board needed for this?

[MetalMan]

This regulator would be better suited to higher voltage than the linear regulator that I made for you before. It will run a lot cooler than the other one. Whether or not it would be a better purchase is up to you - they both have their drawbacks.
I just found a board that can be used! http://www.mouser.com/index.cfm?hand...oductid=458618