XPost: sci.electronics.basics, sci.electronics.components, sci.e   
   ectronics.design   
   XPost: sci.electronics.repair   
   From: krw@nowhere.com   
      
   On Thu, 17 Sep 2015 20:16:17 +0100, "Ian Field"   
    wrote:   
      
   >   
   >"DaveC"  wrote in message   
   >news:0001HW.1B9BFB3100248A5811E4F83CF@news.eternal-september.org...   
   >>> How's it measure?   
   >>>   
   >>> (Or if it's dead, is there another one probably working that you can   
   >>> test?)   
   >>>   
   >>> Tim   
   >>   
   >> Dead. Other with identical markings measure as NPN. What else to determine   
   >> from measurements?   
   >   
   >You can usually distinguish the B/E junction because it will zener somewhere   
   >around 5 - 8V ish.   
   >   
   >You need to keep the test current pretty low - you can get ultra-efficient   
   >LEDs that give a useable indication at only 2mA. Hook one of those up with   
   >an A23 12V keyfob battery and a current limiting resistor.   
      
   InGaN (true) green LEDs are quite bright at only 1mA.  They can be   
   seen at much less than that.   
      
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