SCR's.. Diode's.. Application of them.

Discussion in 'General Electronics Chat' started by ItsTheFark, Dec 28, 2009.

  1. ItsTheFark

    Thread Starter Member

    Jun 14, 2009
    24
    0
    Hello world of -all about circuits- I am halfway through creating my first circuit and have reached a situation... I dont know which prongs on a SCR or Diode are the anode, cathode, and such. I looked at them under a magnifying glass -twice- and have yet to notice anything.

    If anyone can help me now it would be great, Ill post some pictures in a bit.

    EDIT: The SCR looks "like" this, not the exact one but similar http://media.digikey.com/photos/STMicro%20Photos/TOP3.jpg

    The Diode looks "like" this too, but there is 1 major difference, the middle prong of mine is attached to one on the side http://rocky.digikey.com/weblib/IXYS/Web%20Photos/New%20Photos/TO-247AD.jpg
     
    Last edited: Dec 28, 2009
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Does the thing have a number so you can get the data sheet?

    A test with a meter can identify the gate and cathode, as they are the only terminals that will show static conduction. Also, if you place the meter leads on the cathode and anode while in ohms mode, jumping the positive lead to the gate will turn the SCR on.
     
  3. ItsTheFark

    Thread Starter Member

    Jun 14, 2009
    24
    0
    Ah yes it does have numbers, but the Diode/SCR are inaccessable to me at the moment, Ill get them later today. Also, I can see the volt meter being able to test for the diode, but you are confusing me in how I can use it for the SCR. Please, imagine you are describing it to a 10 year old (Its probably too simplistic, but I mean why not go a little more in depth rather than risk me asking -more- questions? =) )
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
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