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Fig 3-1.  Basic design of a triode amplifier.

LOAD LINES

  The triode R-C amplifier circuit is shown in  Fig.  3-1.  Based  on  this
circuit, the equation for the load line is:

                                         e_b = E_bb - ( i_b* R_L )                          (14)

This is the equation for a straight line which, when plotted on the  plate
characteristic curve, shows how the voltage across the  tube  varies  with
the current through the tube.  It is most easily  plotted  from  two  limit
points such as the following:

                       i_b = zero,  when e_b = E_bb
                       e_b = zero,  when i_b = Ebb/R_L

The load line may be drawn through these points.
 
 
 

                                                                                                                 11

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Copyright 2008 for Phyllis K. Pullen, M.D.,
by Robert J. Legg