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using a 3525 pwm chip



hello

 

we are designing a resonant tracking system using the 3525.   we want to use pin 3 "sync""for shifting the freq of the 3525 to a feed back pickup frequency from the actual resonant circuit as it is exposed to different materials that would alter it natural frequency.

 

what percent deviation can be achieved by altering bias to this pin?   do you have any existing circuitry showing  a design??

 

re bob