From: digilyd@hotmail.com   
      
    skrev i en meddelelse   
   news:07fd147f-f3e4-4127-8b18-37de6d134e93@googlegroups.com...   
      
   > Trevor:   
      
   > "SOA"?   
      
   == Safe Operating/Operation Area == combinations of frequency, voltage and   
   current that will not blow the device (transistor) up.   
      
   Remember again the issue of phase angle between output voltage and output   
   current in a reactive load, something that leads to a demand for output   
   current at zero crossing output voltage in some frequency/cies.   
      
   Amplifiers as well as SOA protection has to handle that situation well, lest   
   you should get situations like the previously mentioned unnamed amplifier   
   that had 300 watt in 8 ohms capability on the spec sheet and 11 watts in a   
   real world load when tested by some magazine that put a scope across the   
   loudspeaker leads.   
      
     Kind regards   
      
     Peter Larsen   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)