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THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1952 



Jill register puekugc. 



probably not use such clear plastics and Fig. 31 shows some packages 

 in which the plastic has been loaded with silica to increase its strength 

 and thermal conductivity. The assembly in Fig. 31 consists of a six-digit 

 position encoder at the left, followed by six regenerative pulse amplifiers 

 which in turn feed a six-digit combined translator-shift register. 



N-P-N Transistor Audio Amplifier and Oscillator* 



To the right in Fig. 32 is shown a transformer-coupled audio amplifier 

 employing two M1752 junction transistors. This amplifier has a pass 

 band from 100-20,000 cps and a power gain of approximately 90 db. 

 Its gain is relatively independent of collector voltage from 1-20 volts, 



* The material of this section represents a summary of some work by Wallace 

 and Pietenpol described more completely in Ref. 4. 



