1330 THE BELL SYSTEM TECHNICAL JOURNAL, NOVEMBER 1953 



design and by initial adjustment so that an appreciable change in transis- 

 tor characteristics can be tolerated before readjustment is required. 



ACKNOWLEDGMENT 



The transformer used in the oscillator was designed by H. E. Vaiden 

 and A. M. King. The transistor used was developed by R. J. Kircher 

 and N. J. Herbert. D. J. Houck assisted in testing the circuit. 



REFERENCES 



1. Lepage Seely, General Network Analysis, McGraw Hill, 



2. Kurtz and Corcoran, Introduction to Electric Transients, John Wiley and Sons. 



3. R. M. Ryder and R. J. Kircher, Some Circuit Aspects of the Transis- 



tor, B.ST.J., 28, pp. 367-401, July, 1949. 



Appendix I 



Transformers moly-permalloy dust core 1.57 O.D. 



700- and 900-cycle operation 



Winding (1-2) = 500 turns Q at 700-cycles, 60 



Winding (4-5) = 107 turns Q at 900-cycles, 68 



Winding (4r-6) = 115 turns 



Winding (4-7) = 123 turns 



Winding (4r-8) = 220 turns 



Winding (1-3) = approximately 5560 (adjusted to meet inductance require- 

 ments of 5.2H rb 1 per cent) 



1100- and 1300-cycle operation 



Winding (1-2) = 372 turns Q at 1100-cycles, 73 



Winding (4-5) = 80 turns Q at 1300-cycles, 75 



Winding (4-6) = 86 turns 

 Winding (4-7) = 92 turns 

 Winding (4-8) = 164 turns 



Winding (1-3) = approximately 4080 (adjusted to meet inductance require- 

 ments of 2.8H ± 1 per cent) 



1500- and 1700-cycle operation 



Winding (1-2) = 305 turns Q at 1500-cycles, 82 



Winding (4-5) = 66 turns Q at 1700-cycles, 85 



Winding (4-6) = 71 turns 

 Winding (4-7) = 75 turns 

 Winding (4-8) = 135 turns 



Winding (1-3) = approximately 3360 (adjusted to meet inductance require- 

 ments of 1.9H ± 1 per cent) 



