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Discussion in 'Hobby Electronics' started by Peter, May 28, 2006.

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  1. Peter

    Peter Guest

    What does the Ifsm rating of an scr mean?
     
  2. Phil Allison

    Phil Allison Guest

    "Peter"


    ** I = current, f = forward, s = single, m = maximum.


    Generally it refers to the largest, once in a while, *half cycle 50/60 Hz *
    current pulse allowable.





    ......... Phil
     
  3. Peter

    Peter Guest

    Thanks
    So I have a power supply that has a zener diode across the output to
    trigger an SCR in the event of over voltage.......
    The power supply's fuse is , say 10 amp. Does the SCR's rating have to be
    at least 10 amp or will a lower rating one do given that the fuse in the
    event of a short to ground through the SCR will fail pretty quickly

    Peter
     
  4. Phil Allison

    Phil Allison Guest

    "Peter"

    ** Knew there was a catch to this.

    Post the full schematic and all the details an ABSE.

    Or else piss off .






    ........ Phil
     
  5. Mike

    Mike Guest

    Semiconductors are well known for being great fuse protectors !

    So in your sentence above you are speculating a lower rated SCR will
    not fail (or presumably encounter any harm) whilst the fuse will, by
    maybe restating the question and critiquing your own logic you may
    well have answered it.


    --
    Regards
    Mike
    * GMC/VL Commodore, Calais VL Turbo FuseRail that wont warp or melt !
    * High grade milspec ignition driver electronics now in development
    * Twin Tyres to suit most sedans, trikes and motorcycle sidecars
    Web site under construction http://niche.iinet.net.au
     
  6. Peter

    Peter Guest

    Yeah OK, but what's with the piss off bit?
    Is there some unwritten rule about posting to this NG that I've missed
    somewhere?
     
  7. Phil Allison

    Phil Allison Guest

    "Peter"


    ** Cos YOU are bloody TROLLING !!!!!







    ....... Phil
     
  8. Peter

    Peter Guest

    How is a request for information trolling?
    The power supply in question is a Johnson Unit that I've repaired for a
    friend.
    http://members.ozemail.com.au/~pebarhug/radios/Johnson_1.jpg
    The semiconductors only had in house type numbers on them.
    My p was a genuine question. What seems elementary to you is not to me.
     
  9. Phil Allison

    Phil Allison Guest

    "Peter"

    What does the Ifsm rating of an scr mean?


    ** I = current, f = forward, s = single, m = maximum.

    Generally it refers to the largest, once in a while, *half cycle 50/60 Hz *
    current pulse allowable.



    ** Knew there was a catch to this.

    Post the full schematic and all the details an ABSE.

    Or else piss off .


    ** Cos YOU are bloody TROLLING !!!!!


    ** DO NOT snip out the context - arsehole !

    YOU are bloody TROLLING !!

    YOU are wasting people's valuable time and abusing their good will.

    If YOU have no FUCKING idea how to design things or do repairs - that is
    100% YOUR problem !!!

    Go annoy the wankers at "sci.electronics.design or "
    sci.electronics.repair."








    ....... Phil
     
  10. Peter Howard

    Peter Howard Guest

    Peter,
    Is that Phil Allison you are having a discussion with?
    If so, you are wasting your time trying to reason with him. Just killfile
    the graceless prick. I did, six months ago and have not missed him.
    His technical knowledge is quite good but he turns to psychotic abuse for no
    reason. Or maybe his reason is the gratification of getting a shocked
    reaction. Whatever. He is a troll and is not worth your trouble.

    PH
     
  11. Phil Allison

    Phil Allison Guest

    "Peter Howard"


    ** Piss off - you know nothing IDIOT.





    ....... Phil
     
  12. Peter

    Peter Guest

     
  13. atec77

    atec77 Guest

    It's just the resident autistics way of saying hello , he is a bit queer
    (wink wink) so best if you're thin skinned to push it over in the wanker
    file to be ignored.
     
  14. atec77

    atec77 Guest

    Pot
    Kettle
    black
    Queer
     
  15. Peter

    Peter Guest

    Yeah - done that...no more nonsense from that quarter. What a sad,pathetic
    individual.
     
  16. Mark Harriss

    Mark Harriss Guest

    You weren't to know that Phil's good buddy who DID complete Uni
    went on to design SCR's for GEC or someone like that in the States.
    This is a sore point for "I could have been a genius" Phil.
     
  17. Phil Allison

    Phil Allison Guest

    "Peter"


    ** Bloody TROLLs like Peter always squeal like stuck pigs when they are
    OUTED !





    ........ Phil
     
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