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Zener x 2?

Discussion in 'Norton Commando Motorcycles (Classic)' started by Snakepit, Feb 2, 2014.

  1. Snakepit

    Snakepit

    Joined:
    Jun 19, 2011
    I am using a 192 Watt alternator along with a solid state rectifier on my 73 commando. Just wondering if I should run an extra zener diode in parallel to the one zener to regulate the voltage. thoughts?
     
  2. Snakepit

    Snakepit

    Joined:
    Jun 19, 2011
    Did some reading on it....apparently not.
     
  3. texasSlick

    texasSlick VIP MEMBER

    Joined:
    Jan 2, 2013
    Nature always takes the path of least resistance....vitually all the current will go thru one...the other will do little or nothing. The same principle applies to trying to run 10 amps thru two 5 amp relays....one hogs all the current, the other idles. Trying to fire two plugs off the same coil circuit....same thing, one fires, the other stands by.
     
  4. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
  5. Rosey

    Rosey

    Joined:
    Aug 6, 2011
    I am using twin Zeners with the RM23 Alternator as per what LAB says,but also using twin Bridge rectifiers,works for me.
    Brett
     
  6. chilly

    chilly

    Joined:
    Jan 12, 2013
    Don't pretend to know electrics , but i remember being told by a leccy guru that you need the two to be a matched pair or you are wasting your time .

    Not much more expensive to put modern replacement kit on that does the job is it ?
     
  7. texasSlick

    texasSlick VIP MEMBER

    Joined:
    Jan 2, 2013
    I agree with the circuit given by LAB.....not the usual parallel arrangement I and others objected to.

    As far as doing a parallel arrangement with "matched" zeners, It is doubtful such a perfect match could be obtained in practice, and the comments of my first post applies. Better to follow Chillys suggestion and go with a modern rectifier/regulator. I am thinking of using the Boyer Powerbox.
     
  8. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Joined:
    Nov 20, 2004
    It's only necessary to have a matched pair of zeners when they are connected to the DC side of the rectifier.
     

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