Switching BEC Test Results

I finally charged up my LiPo's today and did a bench test of my E-CRT...oddly using my only my Nomadio's voltage sensor...with the the jumper I was getting 5v, without the jumper it was reading 5.62v...I'm a bit confused but I'm going to try a real run with the jumper out and see if I'm happy with the performance.

[BrianG]

That sounds right: the jumper simply shunts the feedback resistor so the output will be whatever the IC is rated for, which is 5v. The reason why you aren't getting the full 6v is simply because the feedback resistor was not sized properly - could be as simple as the tolerance of the resistor.

[squeeforever]

Hmm. You must have a different version than me and Brian. Mine is 6V with the jumper, but I don't doubt that there are ones that are 6V without it.

[sjcrss]

mine is 6v without jumper and 4v with it...i believe

[SilentMonster]

Mine is just like MacII's. Same voltage too. Back ordered the new Castle one yesterday. This one. Looks great. http://www.horizonhobby.com/Products...rodID=CSECCBEC

[BrianG]

For one heavy duty steering servo (~200 oz-in), 3A is more than enough. I measured current from a servo running unloaded, typically loaded, and stalled, and never got above 2.6A @ 6v IIRC. Of course, if you start using multiple servos for things like mech brakes, you might want something that has a higher current rating. But for me, these cheapies work perfectly.

[SilentMonster]

Originally Posted by BrianG

For one heavy duty steering servo (~200 oz-in), 3A is more than enough. I measured current from a servo running unloaded, typically loaded, and stalled, and never got above 2.6A @ 6v IIRC. Of course, if you start using multiple servos for things like mech brakes, you might want something that has a higher current rating. But for me, these cheapies work perfectly.

Ya but Brian it's a "Castle Creations". :dft012: Can't have to much CC on my ride.

[BrianG]

lol. Brand loyalty eh? :)

[TimXLB]

Brian G:

H,

Thanks for posting all this info about BEC's. we don't worry about them in sedans as we run 6 cells. but as I am looking at other things to turn brushless (right now a ST-R) I'll have to consider these things. (along with lots of others too that I'm sure I haven't thought about yet......)
so along with my B4/T4 I'll be going brushless in my E Maxx. and now I'm working a deal for a Kyosho ST-R for a possible brushless conversion also.
now all I need is a place to race the ST-R......

Thanks

[BrianG]

No problem Tim. :) I do these types of things for fun. No, I don't have a life...

Anyway, I found this which I though was pretty cool. Kinda low on the power level, but may be good for something like a mini or something. The coolest part is that it is pin compatible and very close to the same size as the LM7805 linear regulator.