gV90 



Phase 

 shift 



OOVCR 



OVCR 



]/CR 



]0/CR 



]00/CR 



U) 



Graph 15. Phase shift of R-C band-pass filter 



c 



001 



001/Cff 



ovc/? 



VCR 



lO/C/? 



lOO/Cff 



u) increasing - — ^ 

 Graph 16. Transmission characteristic of Wien bridge 



270 



