ALLIED'S ELECTRONICS DATA HANDBOOK

Common-Emitter Amplifier Circuits

Using Transistors Only

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    In comparing the PNP and NPN circuits   this interchange in the transistor, circuits  
  shown here, note that the current flow in
the components of one is completely re-
versed in the other.  With the vacuum tube,
this complete interchange of current and
voltage polarities does not exist.  Because of 		  which have no parallel in vacuum-tube
circuitry can be produced.  Nevertheless,
the circuits of transistorized equipment are
still auite similar in many respects to those
of equipment employing vacuum tubes. 		 
             
Using PNP Transistors
With Positive
Battery Terminal Grounded 		With Negative
Battery Terminal Grounded
Using NPN Transistors
With Positive
Battery Terminal Grounded 		With Negative
Battery Terminal Grounded
 

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