[Elecraft] VCO Oscillator Test Problem

[Margaret Leber]

W3FPR - Don Wilhelm wrote:

> I can understand Q1 and Q2 getting hot from a shortcircuit somewhere on the
> 8T and 8R lines, but I just don't understand how Q3 and Q4 would get hot -
> they are just switches and should be fully conducting or fully
> non-conducting (and therefore should dissipate very little heat). 

Yes, I recently was dealing with a shorted 8R and was quite convinced 
that all four transistors were hot.

In fact it was just that Q2 was so hot it was heating up the other 
transistors nearby....and it was hard to tell Q2 was hotter than the 
others because it was too hot to touch for long enough to tell.

   73 de Maggie K3XS

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