Homemade BEC?

[petokang]

I was searching on forum to get some info about BECs and I figured out the basic roll of BEC is to regulate voltage goes into servo to 6V and prevents sudden voltage change to the entire circuit.

Then, shouldn't it be possible to make my own one?

With my 7.4V lipo, the ration of the voltage regulating should be

output voltage (6V) / input voltage (7.4V) = 0.8108 ==> 0.8 approx.

And I looked on Tekin website to find out capacitance for caps and they suggest 16V 180uF capaciror for b1r ESC that I just ordered. I have 2 of 25v 1000uF cap so it should be more than enough.

What I'm thinking is to build a BEC system with my own components.

Guess it would be much cheaper if I success with this one lol.

How do you guys think? Any tips would be help!

Thanks.

[Charlie-III]

Ummm...it's a bit more to it than that. You are thinking like a resistor, "I have X voltage & I want it dropped to Y voltage".
What you really want is, "I put in a range of voltages, but always get out a single voltage". Having it adjustable is nice as well, unless you want to build a BEC for each output voltage you want.

Not saying you can't/shouldn't do it, just saying it takes some more.

[DickyT]

Electronics section?

[JeremyH]

Just wire the lipo straight to your servo.

[petokang]

Thanks for response guys.

I think I was confused voltage regulator with voltage divider when I was writing my post.

I though I could make voltage regulator on my own since I have made one in my class before.

Anyway, comment from you guys helped me a lot to understand what I need to do and I will try to build my own BEC later.

[dkur]

http://www.dream-models.com/eco/electrics-bec1.html

Haven't tried it myself but looks promising.
An easier route is to buy a 10A BEC from Castle for around $20.

[Twiztid Metal]

Originally Posted by dkur

http://www.dream-models.com/eco/electrics-bec1.html

Haven't tried it myself but looks promising.
An easier route is to buy a 10A BEC from Castle for around $20.

or a resistor and an old servo wire for $2



I was just thinking of this the other day! I havent did the math (google) to find out what resistor i needed, but I was also thinking of trying it. set it at a good 5 or 6v BEC wired to the RX from the battery.

[2500hdon37s]

Originally Posted by dkur

http://www.dream-models.com/eco/electrics-bec1.html

Haven't tried it myself but looks promising.
An easier route is to buy a 10A BEC from Castle for around $20.

the CC will probaly take up less space too

[Charlie-III]

Originally Posted by Twiztid Metal

or a resistor and an old servo wire for $2



I was just thinking of this the other day! I havent did the math (google) to find out what resistor i needed, but I was also thinking of trying it. set it at a good 5 or 6v BEC wired to the RX from the battery.

A BEC will keep the output voltage constant regardless of input (battery) voltage.
As I stated before, a resistor drops the voltage a certain amount, but this also means your voltage to the servo will vary as the pack voltagfe varies. This is why we run BEC's NOT resistors.

[JeremyH]

Originally Posted by Twiztid Metal

or a resistor and an old servo wire for $2

Or nothing for $0.

[dkur]

Originally Posted by Twiztid Metal

or a resistor and an old servo wire for $2



I was just thinking of this the other day! I havent did the math (google) to find out what resistor i needed, but I was also thinking of trying it. set it at a good 5 or 6v BEC wired to the RX from the battery.

I am fairly certain your prescribed method would not produce consistent or reliable results and quite possibly cost more when it's all said and done after you burn up some electronics. You are forgetting a crucial part of the equation that being amperage. Be sure to make that part of your google search also.

Before you flame just remember we are only trying to help out. I wash my hands of this. Good luck with your electronics experiments.