1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Project Honda XL250s 1979

Discussion in 'Your 250cc Projects' started by Murdo, Jan 13, 2018.

  1. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    3,645
    Likes Received:
    2,088
    Trophy Points:
    898
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide, South Australia
    My Bike:
    Yamaha's, 1990 FZR250R 3LN3 , 1986 XT250TS 57R , 1984 IT200L 43G
    Nah the 2x power supply's i have are both AC, my old man gave them to me with a few rectifier's in case i needed them, old man is a retired ex Telstra Technician
    This is the smaller one i use to run 6x 1 metre long 7020 led strip light's in my shed

    20190909_190235.jpg
     
  2. Andych

    Andych Well-Known Member Premium Member

    Messages:
    2,491
    Likes Received:
    1,460
    Trophy Points:
    798
    Joined:
    Oct 6, 2016
    Gender:
    Male
    Location:
    Sydney
    My Bike:
    1987 Yamaha SRX250, Honda 1975 CB400F, Honda 1974 CB250 G5 ?
  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    3,645
    Likes Received:
    2,088
    Trophy Points:
    898
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide, South Australia
    My Bike:
    Yamaha's, 1990 FZR250R 3LN3 , 1986 XT250TS 57R , 1984 IT200L 43G
    My 12V DC led's have never flashed running off AC, they're on for 12 - 18 hour's a day for the last 3 year's
     
  4. Andych

    Andych Well-Known Member Premium Member

    Messages:
    2,491
    Likes Received:
    1,460
    Trophy Points:
    798
    Joined:
    Oct 6, 2016
    Gender:
    Male
    Location:
    Sydney
    My Bike:
    1987 Yamaha SRX250, Honda 1975 CB400F, Honda 1974 CB250 G5 ?
    They have to flash as it is Alternating current and a normal LED is DIrect current.
    The frequency will be high enough that they appear to be on all the time as explained in that link.
    Your power supply is entirely different to what will be on a 6 volt bike charging system.
    It won’t be as simple as you make it out to be.



    Sent from my iPhone using Tapatalk Pro
     
  5. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    3,645
    Likes Received:
    2,088
    Trophy Points:
    898
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide, South Australia
    My Bike:
    Yamaha's, 1990 FZR250R 3LN3 , 1986 XT250TS 57R , 1984 IT200L 43G
  6. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

    Messages:
    5,122
    Likes Received:
    4,019
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    Maico 250, Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, ZZR250 plus a few others.
    Thanks, I've read that. Have bought the LED light and will see how it goes when it arrives.
     
    • Like Like x 1
  7. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

    Messages:
    5,122
    Likes Received:
    4,019
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    Maico 250, Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, ZZR250 plus a few others.
    Today I fitted up the LED light and fired up the engine. With the headlight (6volt system) in place and the LED added to the wiring it flickers badly and would be unusable (this is direct AC from alternator). The voltage was only 7.4 at high revs with bulb in place and 15.7 without bulb, so when I connected that to the LED it promptly blew something and it no longer works (even on 12 volt battery). I put the standard bulb back in and it blew too, so I don't know what has happened there. Ran out of time to check any further.
    My question today is how to wire up the bridge rectifier from a single wire from the coil? Do I just use the one wire to one of the AC terminals, run a bridging wire to both terminals or do I have the wrong type for a single wire?
    xxx 008.jpg
     
  8. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

    Messages:
    3,645
    Likes Received:
    2,088
    Trophy Points:
    898
    Joined:
    Jun 18, 2016
    Gender:
    Male
    Occupation:
    Panel Beater, Spray Painter, Custom Fabricator
    Location:
    Adelaide, South Australia
    My Bike:
    Yamaha's, 1990 FZR250R 3LN3 , 1986 XT250TS 57R , 1984 IT200L 43G
  9. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

    Messages:
    5,122
    Likes Received:
    4,019
    Trophy Points:
    1,148
    Joined:
    May 4, 2013
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Tamworth, NSW
    My Bike:
    Maico 250, Royal Enfield 250, CF 250 V5 and 650TK, XL250, CBR250, ZZR250 plus a few others.
    Thanks my67xr, but if I use the rectifier then it will be DC and have no flickering anyway. Will have to get a Zener diode to stop the power spikes and a bit of tricky wiring to run straight from the alternator to LED, and the standard wiring to headlight.
     
  10. Andych

    Andych Well-Known Member Premium Member

    Messages:
    2,491
    Likes Received:
    1,460
    Trophy Points:
    798
    Joined:
    Oct 6, 2016
    Gender:
    Male
    Location:
    Sydney
    My Bike:
    1987 Yamaha SRX250, Honda 1975 CB400F, Honda 1974 CB250 G5 ?
    Seems like this guy has done what you want to do @Murdo .... as per @my67xr mentioned but with a Diode in the feed to the Capacitor.
     
    • Like Like x 1
  11. ShaneP

    ShaneP Well-Known Member Premium Member Contributing Member

    Messages:
    1,788
    Likes Received:
    724
    Trophy Points:
    623
    Joined:
    May 12, 2014
    Gender:
    Male
    Location:
    Yeppoon
    My Bike:
    Yamaha FZR250 speed bike, Yamaha YZ/WR250F, Kawasaki ZX2R, Honda VTR250, DR350 (x 3.5), a couple of prototypes and whatever else.
    Household AC is 50hz, 3000rpm (tv is 24hz, just for comparison), idle is half that and the light only works when there is sufficient voltage in the right direction, which means a lot of off time. Rectifiers need a load to regulate voltage, reg/rec need a battery of about the right voltage. The capacitor is supposed to lead a voltage in an AC circuit, not sure about how it's supposed work on the DC side. But the bridge rectifier needs the AC power supply and an earth are the 2 AC connections, and there should be one marked + for the positive DC output and a - for the negative DC output. But it is only a rectifier, you'll need a regulator (some Kawasaki bikes had the regulator built into the charge coil, somehow). LED lights mightn't draw much load, so you might need the bulb, too. I have probably only added to the confusion. Sorry to hear that the light you have seems to have blown.
     

Share This Page