LAYOUT AND THE CONTROL OF INTERFERENCE 



input resistance of the amplifier is low, such irrigation may actually increase 

 magnetic pick-up. 



6V 



secondary 



Phase 

 control 



1M 



Compensation 

 signal out 



Magnitude 

 control 





Figure 42.15 



Compensation for 50 cycle pick-up 



In specially intractable cases, where all else has failed, it may be worth- 

 while to introduce into the amplifier at some suitable point a compensating 

 50 cycle signal, variable in amplitude and in phase, from some such device as 

 that outlined in Figure 42.15. 



664 



J 



