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7.2v receiver battery ?

  • 21-03-2009 9:23pm
    #1
    DennisZ
    Registered Users, Registered Users 2 Posts: 110 ✭✭


    Gurus,

    is it ok to power up rc receiver (Futaba 136F) directly from 7.2v battery ?
    does it (recv) have any step down circuitry to make it 5 or 6v ?
    not sure if servos will be fine with voltage above 6v ...

    any ideas ?


Comments

  • #2
    syl77
    Registered Users, Registered Users 2 Posts: 446 ✭✭syl77


    DennisZ wrote: »
    Gurus,

    is it ok to power up rc receiver (Futaba 136F) directly from 7.2v battery ?
    does it (recv) have any step down circuitry to make it 5 or 6v ?
    not sure if servos will be fine with voltage above 6v ...

    any ideas ?

    The Rx probably could take the power but your servos wont last long on 7.2. you should use a regulator between the Rx and battery.


  • #3
    coolwings
    Moderators, Recreation & Hobbies Moderators Posts: 3,455 Mod ✭✭✭✭coolwings


    Don't try it.
    Those are 5V circuits. They tolerate 6V or 4.8V but a 7.2V battery will very likely let the "magic smoke" out.
    You could place a resistor in between the battery and the rx to reduce the voltage. That would function as a simple regulator.


  • #4
    Marcio.souza
    Closed Accounts Posts: 50 ✭✭Marcio.souza


    Just buy a UBEC if you dont understand eletronics,how to make a regulator and you will not have any problem at all.The ubec receive the 7,2 volts and convert to 6v or 5v,you can programming the UBEC with jumpers.
    Look those two

    http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=3735


    http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=4319


    I always buy from this website,its cheap,good and its in dollars


  • #5
    DennisZ
    Registered Users, Registered Users 2 Posts: 110 ✭✭DennisZ


    Thanks guys.
    I certainly know about UBEC,
    my question arose from friendly(?) advise I got at one local model shop :(

    anyway, problem has gone - have to use heavier battery (9cell NiMH) to get balance right, so UBEC will be there.


  • #6
    syl77
    Registered Users, Registered Users 2 Posts: 446 ✭✭syl77


    have to use heavier battery (9cell NiMH)
    :confused: wont you still be over 6 volts with 9cells ??


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  • #7
    DennisZ
    Registered Users, Registered Users 2 Posts: 110 ✭✭DennisZ


    syl77 wrote: »
    :confused: wont you still be over 6 volts with 9cells ??
    DennisZ wrote: »
    so UBEC will be there.
    .


  • #8
    Marcio.souza
    Closed Accounts Posts: 50 ✭✭Marcio.souza


    Where do you fly and what do you fly? Airplanes? helis?


  • #9
    DennisZ
    Registered Users, Registered Users 2 Posts: 110 ✭✭DennisZ


    Marcio.souza wrote: »
    Where do you fly and what do you fly? Airplanes? helis?
    planes. at Phoenix pk.


  • #10
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    DennisZ wrote: »
    planes. at Phoenix pk.


    How long are you flying there, i used to years ago, about 1988 till mid 90`s and the odd time from then on


  • #11
    DennisZ
    Registered Users, Registered Users 2 Posts: 110 ✭✭DennisZ


    robbie7730 wrote: »
    How long are you flying there
    not that long, only started in 2007.
    missed entire summer'08, was out only twice this yr.
    ...hm, no - three :) was on a slope this Sunday.


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  • #12
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    DennisZ wrote: »
    not that long, only started in 2007.
    missed entire summer'08, was out only twice this yr.
    ...hm, no - three :) was on a slope this Sunday.

    yes is a few years since i was regularly there, with fast nitro planes. Went once last year with the heli, just started flying a glider last week. Good with camera on it


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