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» Information on camouflage patterns for German seahund
BEC - Switch mode EmptyFri Mar 15, 2024 4:36 pm by david f

» WW2 mini sub build
BEC - Switch mode EmptyTue Mar 12, 2024 1:56 pm by geofrancis

» Not the hobby I expected :)
BEC - Switch mode EmptySun Mar 10, 2024 6:30 pm by cat

» 868/915 Mhz as a viable frequency for submarines.
BEC - Switch mode EmptyWed Mar 06, 2024 4:50 pm by tsenecal

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BEC - Switch mode EmptyMon Feb 19, 2024 9:24 pm by Michaelc

» Choice of CAD software and Printer for 3D printing
BEC - Switch mode EmptyThu Feb 15, 2024 1:53 pm by david f

» Engel Nautlus
BEC - Switch mode EmptyTue Feb 13, 2024 9:15 am by palmert6

» RF 27/433MHz maximum depth in pools (1-5 ppm chlorine, 6-8pH)
BEC - Switch mode EmptyThu Feb 08, 2024 2:05 pm by david f

» Arduino proportional control of a piston tank
BEC - Switch mode EmptyThu Feb 08, 2024 1:37 pm by david f

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    BEC - Switch mode

    david f
    david f
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    BEC - Switch mode Empty BEC - Switch mode

    Post  david f Mon May 22, 2023 10:32 am


    Sorry I can't remember (or find) the colleague  who recommended these.

    I have tried one in my Pioneer sub (admittedly on 458 Mhz where noise and glitches are generally no problem) on several occasions and it works fine. It may have changed my generally negative view of noise from switch mode power supplies. (I have ordered another couple.)

    BEC - Switch mode Screen10

    Sellers Specification:

    Brand new
    Size: approx. 42*24*11mm

    Output Voltage: 5V or 6V (Changeable with an output-voltage select switch)

    Continuous Output Current: 3 Amps

    Input: 5.5V-26V (2-6 cells lithium battery pack or 5-18 cells NiMh /NiCd battery)

    Fine workmanship and good performance.

    Easy to use.

    Long service life.



    Package included:

    1 x 3A RC UBEC Switch

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    geofrancis


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    BEC - Switch mode Empty Re: BEC - Switch mode

    Post  geofrancis Mon May 22, 2023 11:28 am

    I have never had any Issues with them but i have never done any tests for noise. I assume these work so well because they have shielding, its not just a bare PCB.

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    david f
    david f
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    Post  david f Mon Aug 07, 2023 10:13 am

    I do like these. Now tried in all my subs. Neat and very small (and not expensive!)
    Two more on order.

    David

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    david f
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    BEC - Switch mode Empty Re: BEC - Switch mode

    Post  david f Tue Aug 29, 2023 12:07 pm

    Slight modification to my overall recommendation.
    I have just gone back to a linear BEC for my Nautilus 2 model. This uses hefty motors driving sail winches. This seemed to give voltage drops which caused the Arduino in the winches to Reset. I tried including a large electrolytic to buffer these voltage swings but it didn't solve the problem.

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    geofrancis


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    Post  geofrancis Tue Aug 29, 2023 2:19 pm

    I would use a pair If that is happening. One for the winches and another for the rest of the system. I have a pair on my tug. One at 5v for rc electronics and one at 6v running my sound, smoke lights Winches etc. Since the little oil smokers can pull over an amp each they just overload the main bec if I try and run them with it.
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    tsenecal
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    BEC - Switch mode Empty Re: BEC - Switch mode

    Post  tsenecal Tue Aug 29, 2023 3:31 pm

    I use two BECs in my sailboats... primarily so that i can run the sail winch servos at a higher voltage than the rest of the system, and secondly, it is a large 20 amp capacity switching BEC because of the reasons already listed... huge amp draw possible when all servos are under load.

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    david f
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    BEC - Switch mode Empty Re: BEC - Switch mode

    Post  david f Wed Aug 30, 2023 8:29 am

    Using 2 BECs sounds like a very good idea. Thanks I will give that a go.
    (Linear BECs are so inefficient unless you want a warm WTC !)

    David

    Edit 2 hours later. That idea works well on the bench. Thanks Both!
    Three more switch mode BECs on order.
    cat
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    BEC - Switch mode Empty Re: BEC - Switch mode

    Post  cat Wed Aug 30, 2023 3:50 pm

    Surely this is a silly question, but since ESCs turned up I've always powered my radios from the built in BEC in my speed control.
    The ESC I'm looking at doesn't actually have any option to disable BEC.
    I assume you can have multiple, assuming they all push the same dc voltage onto the rail?

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    geofrancis


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    BEC - Switch mode Empty Re: BEC - Switch mode

    Post  geofrancis Wed Aug 30, 2023 4:06 pm

    cat wrote:Surely this is a silly question, but since ESCs turned up I've always powered my radios from the built in BEC in my speed control.
    The ESC I'm looking at doesn't actually have any option to disable BEC.
    I assume you can have multiple, assuming they all push the same dc voltage onto the rail?

    You can just disconnect the centre pin from the ESC servo plug if you want to stop its 5v regulator powering anything.

    Running more than one is generally fine they will almost always have diode on the output so what will happen is the regulator with the highest voltage will take most of the load, then that load will get distributed as the voltage falls between the rest in order of voltage. the problem is most escs have a linier regulars so what will happen is one will overheat trying to run everything.

    It's better to split the 5v system, with your critical items split from the high loads with independent regulators.


    Last edited by geofrancis on Thu Aug 31, 2023 5:40 am; edited 2 times in total

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    tsenecal
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    Post  tsenecal Wed Aug 30, 2023 9:00 pm

    i use external BECs because the BEC built into most ESCs is good for only one or two normal size servos.  so, if you have rudder/rear plane/fwd plane, the BEC is probably already not happy, add a pitch controller, a high torque or high voltage servo into the mix, and now your ESC's BEC is really out of its comfort zone.

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    cat
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    BEC - Switch mode Empty Re: BEC - Switch mode

    Post  cat Wed Aug 30, 2023 10:29 pm

    Right, I get you, move too many servos at once and the current draw is going to get the little regulator in the ESC all sad and sagging.
    I'm unused to anything needing more than two or maybe three servos so this explains my ignorance. being thick explains the rest :D

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    david f
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    BEC - Switch mode Empty Re: BEC - Switch mode

    Post  david f Mon Sep 04, 2023 11:31 am

    Those 2 BECs worked very nicely  in the model this Sunday.
    Thanks for  the suggestion, Chaps!

    Update over here:

    https://www.theassociationofmodelsubmariners.com/t1955-nautilus-ii-by-robert-fulton#12551

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