TRANSISTORS IN SWITCIUXG (IIUCUITS 



1221 



T_ 



"-Vbb 



(a) 



BASE BISTABLE 

 CHARACTERISTIC 



Oi. 



'L 



:Rb 



rVbb 



( b) BASE MONOSTABLE 



CHARACTERISTIC 



r 



:Rb 



pVbb 



BASE ASTABLE 

 (C) CHARACTERISTIC 



Fig. 11 — Base connection switching circuits. 



