Frequency modulator design

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i am not sure whether you can generate fm modulator by using colpitts oscillator but surely u can design fm using hartleys oscillator by replacing the capacitor in the tank circuit by a varicap....
 
i am not sure whether you can generate fm modulator by using colpitts oscillator but surely u can design fm using hartleys oscillator by replacing the capacitor in the tank circuit by a varicap....
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Colpitts and Hartley oscillators are very similar, and both can be adapted as frequency modulators.

hey can you please tell me about working off this circuit?
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What do you need to know? Specify please
 

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