hello

which type of am modulator is good for am transmitter
diode modulator or transistor modulator
where diode or transistor modulator is use

 

what kind of AM? are your goals to suppress carrier and sideband or just 'normal' AM?

diode modulator (ring modulator) is used for DSB/SC which is same as AM but with carrier suppressed. demodulating is another story, regular AM can easily be demodulated using simple envelope detection circuit while DSB/SC requires more complicated approach (multiply by signal of same frequency and phase as carrier).

pics show normal AM, DSB (suppressed carrier), and DSB demodulated...