1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

6v/12v Motorcycle Battery Charger

Discussion in 'Automotive Electronics' started by steptoe, Sep 8, 2002.

  1. steptoe

    steptoe New Member

    Joined:
    Sep 8, 2002
    Messages:
    1
    Likes:
    0
    Hi,

    Can anybody help me with a circuit for a led-acid or sealed gel 6v and 12v motorcycle battery charger circuit, similiar to the one at given below would be ideal, but its only for 12v batteries

    http://users.otenet.gr/~athsam/car_12v_battery_charger.htm

    I have another very good one, that would be perfect for what I need, but getting some of the components from one source only is proving very difficult. I tried RS Componenets, but they don't do all them, and also Maplin electronics, but they don't do all of them either, also RS components mainly deal in bulk




    If anybody could suggest how to make up the very low value resistors given in the circuit below, then I'll choose that one, as its exactly what I need to charge motorcycle batteries, which I have been advised need a lower charge rate than car batteries

    http://www.uoguelph.ca/~antoon/circ/lader.htm

    Thanks for any help
     
  2. Phasor

    Phasor Member

    Joined:
    Aug 14, 2002
    Messages:
    703
    Likes:
    0
    Location:
    Sydney, Australia
    Referring to the first circuit: I think you will need to drop the value of D2, from 6.8V to maybe 3.3V. Also, the value of R2/TR1 may need tweaking. I'll try simulate it and get back to you...
     
  3. mechie

    mechie New Member

    Joined:
    Sep 4, 2002
    Messages:
    591
    Likes:
    3
    Location:
    Lincolnshire, England
    Parts for www.uoguelph.ca/~antoon/circ/lader.htm

    Iv'e been browsing the RS and Maplin catalogues and seem to have found all the 'tricky' bits for your second circuit ...

    Radio Spares :-------------------------- Order code - Price (EX VAT)
    LM350 (TO3 case) ----------------------- 126-9216 -- £5.59
    Heatsink (3.3C/W, pre-drilled for TO3)- 234-2485 -- £2.63

    Maplin :---------------------------------- Order code - Price (Inc VAT)
    MC1458 (same as LM1458 - dual 741) - QH46A ----- £0.49
    BC558 low power PNP transistor -------- QQ17T ----- £0.08
    0.1 ohm resistor #3Watt# --------------- W0.1 ------- £0.37 see below :idea:
    -------------------- #7Watt# --------------- L0.1 -------- £0.33
    5A 50v rectifier (P600A @ 6Amp) ------- UK59P ------ £0.49

    The best transformer I can see in these two suppliers is Radio Spares:-
    100VA chassis mounting with 2 off 9v windings (connected in series gives 18v)
    order code 805-265 -- £12.54 Ex VAT

    The rest is easy - all the RS bits I've listed are available in quantities of one, shopping around (in this case from two suppliers) is a way of life :roll: .

    :idea: The low value resistor could be either of the two I've listed, the 7 Watt one is physically bigger but cheaper - if size matters then use the smaller one :shock: otherwise, save 4p :wink:
    You could put ten 1 Ohm resistors in parallel (each carrying 1/10 of the 2 Watts = 0.2W) or twenty 2 Ohm (each 0.1W) or a hundred 10 Ohm --- but why bother? buy one, it's neater.
    Everything else is listed!
     
  4. dave

    Dave New Member

    Joined:
    Jan 12, 1997
    Messages:
    -
    Likes:
    0


     
  5. Tarsil

    Tarsil New Member

    Joined:
    Jul 1, 2006
    Messages:
    290
    Likes:
    0
    Location:
    Timisoara, Romania

    Try using this charger http://web.telia.com/~u43200663/power/charger.htm
    U can use for BC547 a 2n3904 or 2n4401
    Use instead of BC557 a PNP power transistor able of delivering the necesary current (like BD244....i bought one for <0.5$)
     
  6. StopGo

    StopGo New Member

    Joined:
    May 21, 2006
    Messages:
    75
    Likes:
    0
    Location:
    UK
    Use a Ni-Cd charger on a Motorcycle battery ?

    :rolleyes: Erm ?

    That seems less than optimal.
     
  7. Hero999

    Hero999 Banned

    Joined:
    Apr 6, 2006
    Messages:
    14,902
    Likes:
    79
    Location:
    England
    The only "tricky" part in your first circuit is the 17V transformer, which can easily be susbsituted with the 18V mechie suggested for the 2nd circuit.

    How big are your motorcycle batteries?

    This circuit is designed for car batteries and will probably put far too much current into a motorcycle battery.
     
  8. Tarsil

    Tarsil New Member

    Joined:
    Jul 1, 2006
    Messages:
    290
    Likes:
    0
    Location:
    Timisoara, Romania
    Why not use a this NiCd charger for the Mot batery?
    I can modify the curent given to the batery (to 1/10 of his rating) and set the off voltage. I meen the acid batery is more robust, no?
    No memory efect etc.
     
  9. Tarsil

    Tarsil New Member

    Joined:
    Jul 1, 2006
    Messages:
    290
    Likes:
    0
    Location:
    Timisoara, Romania
    Th fro the tip.
    I was recomanding the one at http://web.telia.com/~u43200663/power/charger.htm
     
  10. Tarsil

    Tarsil New Member

    Joined:
    Jul 1, 2006
    Messages:
    290
    Likes:
    0
    Location:
    Timisoara, Romania
    May bat are like 4Ah....and "th for the tip":)
     
  11. riza

    riza New Member

    Joined:
    Sep 9, 2006
    Messages:
    3
    Likes:
    0
    what about if I want make modification for the circuit to Charge 2 batteries in series so I need 24 Volt charger....! please help me
     
  12. steev

    steev New Member

    Joined:
    May 31, 2006
    Messages:
    87
    Likes:
    0
    in that site only just move a page back(u posted) and have a look at automobile circuits section.u'll find what u want http://users.otenet.gr/~athsam/
     

Share This Page