322 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1956 



note: all capacitors and inductors 

 IN tuned circuits have a 



tolerance of ±0.1% 



Fig. 17(a) — AZS circuit. 



battery potentials are reversed and if an n-p-n junction transistor is 

 used. 



5.2. Factors Determining the Accuracy of the Voltage Comparator 



Fig. 19 shows the ac equivalent circuit of the voltage comparator. In 

 the equivalent circuit Ri is the dynamic resistance of the diode Di , Rg 

 is the source resistance of the input voltage, and R2 is the impedance of 



