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previous: Morris I have some questions about cathode... -- 5/2/2000 5:42 PM View Thread

Re: Cathode Follower Questions

5/2/2000 7:42 PM
kg
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Re: Cathode Follower Questions
morris, let me see if i read you correctly...  
 
plate loaded stage  
 
direct coupled from plate to grid of  
 
cathode follower with resistance in cathode circuit  
 
AC coupled (through cap) from cathode to one side of center tapped choke  
 
center tap to ground  
 
floating ends to output grids  
 
right?  
 
in terms of which value of cathode resistor, just measure your voltage on the plate loaded stage's grid, which will be the approximate voltage on the cathode of the cathode follower. you can size the cathode resistance of the cathode follower using R=V/I. i'd say pull a couple of mils through it--that's really all you need. the gain through the CF won't change much with varying plate currents. because of the 100% degeneration going on, the CF's don't need very much current at all to be linear as all hell.  
 
i like the inductive phase inversion/grid impedance. the outputs will be VERY stable with such a low DCR path to ground... not much chance of runaway here!  
 
kg

 
Replies:
Morris I believe you have it down. I'm tr... -- 5/2/2000 8:12 PM