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Questions about analog communication

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deepo_85

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1) in tuned amplifier config wats the role played by specific transistors..
say if i use a BF 194 instead of a SL 100 how does it help my cause??


2)Y is it so dat in demodulation circuits we use a OA79 diode instead of a BY127??

3)wats the best way to generate a SSB signal from a DSBSC wave with fc=100khz
fm arnd 10khz?
if i need to design a 2nd order butterworth filter (LPF) for this wats the cutoff to be designed for?? 100khz(i.e. fc) or fc-fm??
 

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