hat
se batman a fè via varicap an doub D1 / D2 ak varyab C8 nan CAPACITOR. Pa chanje vòltaj la patipri ranvèse sou varicap a (dapre yon siyal opinyon) ou esansyèlman chanje capacité yo konsa frekans lan sonorite nan kous la tank la. Sa a kondwi a frekans batman nan siyal la opinyon nòmalman. se Pwodiksyon an nan etap nan osilator / modulation manje nan yon klas Yon etap chofè bati lè l sèvi avèk Q4 nan tranzistò. Siyal la pwodiksyon se pli lwen renforcé pa manje a nan yon anplifikatè pouvwa klas C bati toutotou Q5.
eng
The modulation is done via the dual varicap D1/D2 and the variable capacitor C8. By changing the reverse bias voltage on the varicap (according to an input signal) you essentially change their capacitance thus the resonance frequency of the tank circuit. This leads to frequency modulation of the input signal virtually. The output of the oscillator/modulator stage is fed to a class A driver stage built using the transistor Q4. The output signal is further strengthened by feeding in to a class C power amplifier built around Q5.