The Association of Model Submariners.

Would you like to react to this message? Create an account in a few clicks or log in to continue.

* THE FORUM FOR ALL THOSE INTERESTED IN BUILDING AND OPERATING MODEL SUBMARINES *



Join the AMS - Registered Forum users can become members of the AMS and it's free ...... To join send an email with your name , address and phone number to amstreasure@googlemail.com


For a guide to past events see the "Shows and Events" section.

Papplewick Pumping Station SUBMARINE Day. 31st March - 1st April 2024.

$$$

&&&

::::

Who is online?

In total there are 4 users online :: 0 Registered, 0 Hidden and 4 Guests

None


Most users ever online was 180 on Tue Nov 05, 2019 6:03 am

Latest topics

» U-Boat R/C?
BEC - Switch mode EmptyYesterday at 10:05 am by stig58

» Cheap Arduino Auto leveler
BEC - Switch mode EmptySat May 11, 2024 6:53 pm by 17b

» No reverse on Brushless ESC
BEC - Switch mode EmptyTue May 07, 2024 3:26 pm by geofrancis

» Peral Submarine of 1888
BEC - Switch mode EmptyMon May 06, 2024 11:16 am by david f

» Newbie needs advice!
BEC - Switch mode EmptyFri Apr 26, 2024 1:58 pm by david f

» Modulated electric fields for submarine communication in a "heads up" from Harry!
BEC - Switch mode EmptySun Apr 21, 2024 6:09 am by geofrancis

» 868/915 Mhz as a viable frequency for submarines.
BEC - Switch mode EmptyWed Apr 10, 2024 5:48 am by tsenecal

» Laser cut Robbe U47 conversion
BEC - Switch mode EmptyTue Apr 09, 2024 3:40 pm by david f

» ExpressLRS - 868/915 Mhz equipment
BEC - Switch mode EmptyTue Apr 02, 2024 3:27 pm by tsenecal

Statistics

Our users have posted a total of 12458 messages in 1984 subjects

We have 1012 registered users

The newest registered user is Tony 51

Similar topics

4 posters

    BEC - Switch mode

    david f
    david f
    AMS Treasurer


    Posts : 2401
    Join date : 2010-11-10
    Age : 73
    Location : Cumbria

    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

    geofrancis likes this post

    avatar
    geofrancis


    Posts : 291
    Join date : 2021-09-24

    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.

    david f likes this post

    david f
    david f
    AMS Treasurer


    Posts : 2401
    Join date : 2010-11-10
    Age : 73
    Location : Cumbria

    BEC - Switch mode Empty Re: BEC - Switch mode

    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

    geofrancis and cat like this post

    david f
    david f
    AMS Treasurer


    Posts : 2401
    Join date : 2010-11-10
    Age : 73
    Location : Cumbria

    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.

    geofrancis likes this post

    avatar
    geofrancis


    Posts : 291
    Join date : 2021-09-24

    BEC - Switch mode Empty Re: BEC - Switch mode

    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.
    avatar
    tsenecal
    Guest


    Posts : 311
    Join date : 2015-04-01

    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.

    geofrancis likes this post

    david f
    david f
    AMS Treasurer


    Posts : 2401
    Join date : 2010-11-10
    Age : 73
    Location : Cumbria

    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
    cat


    Posts : 65
    Join date : 2022-03-21

    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?

    geofrancis likes this post

    avatar
    geofrancis


    Posts : 291
    Join date : 2021-09-24

    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

    david f and cat like this post

    avatar
    tsenecal
    Guest


    Posts : 311
    Join date : 2015-04-01

    BEC - Switch mode Empty Re: BEC - Switch mode

    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.

    david f likes this post

    cat
    cat


    Posts : 65
    Join date : 2022-03-21

    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

    david f likes this post

    david f
    david f
    AMS Treasurer


    Posts : 2401
    Join date : 2010-11-10
    Age : 73
    Location : Cumbria

    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

    geofrancis likes this post


      Current date/time is Sun May 19, 2024 6:54 am