Adjustable Vfo Temperature Compensator Circuit

  
Use of a differential capacitor allows temperature compensation of LC circuit using an NFO and N1500 ceramic. C6 is a differential capacitor that has two stators and one common rotor. When one capacitance (stator) is maximum, the other is minimum.
Adjustable Vfo Temperature Compensator Circuit - schematic

LI, CI, C2, and C3 are tuning, trimming, and fixed capacitors, respectively.




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