On Tuesday, 4 February 2020 14:00:00 UTC, default  wrote:   
   > On Mon, 3 Feb 2020 21:05:07 -0800 (PST), tabbypurr wrote:   
   >   
   > >> it can overload the one side of the differential pair and drive the   
   > >> next stage directly, invoke the fault condition known as phase   
   > >> inversion etc...  the op-amp may still be amplifying, but it's not   
   > >> running in any mode that's blessed by the data-sheet.   
   > >   
   > >It reminds me a lot of suicide bias. It's deprecated but still gets used in   
   cost cutting commercial products.   
   >   
   > What is suicide bias?   
      
   I see a search was not helpful :) Biassing a tr by a single R from V+ to base,   
   and nothing else. No thermal or gain stabilisation.   
      
   > and what makes it desirable from a   
   > bean-counter's point of view?   
      
   just one resistor.   
   Quiescent collector voltage can cover a fair range, so only good for low V_out   
   & low P_diss so you don't get too much thermal drift. But it works.   
      
      
   NT   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)