zhi_yi
Full Member level 4
hi there, please help me
when i want to design an amplifier, i need to consider the frequency respons, the gain, the noise, the cost, the efficiency, and anything else, please tell me what are them?
when i want to determine the frequency respons, it's mean that i need to determine the bandwidth, please tell me how to find the bandwidth? i need to know the high cut off frequency, and the low cut off frequency, and then the bandwidth is high - low, is it right? but how to count the high and low cut off frequency?
and about the noise, what point i need to consider about? and what should i do to reduce the noise? is it i can reduce the noise in the pre-amp stage, and then the output from the pre-amp go into the power amp, and ampilfied? in the pre-amp stage, we can change the bass, treble, midrange, volume, etc, why the noise reduced if it passed the pre-amp stage?
in the amplifier, there are many class of amplifier, like class A, B, C, D, etc, the efficiency between those class is different, and i heard that class A for voltage/current amplification, class B for impedance matching/buffer, class C and class D is more efficient, the class D could be used for subwoover, is it true? class C can be used for radio signal amplification, is it true? because in the class C has the LC for resonantor, is it true? what is the main purpose that we distinguish them into many class? is it just to distinguish their efficiency? or anything else? please tell me
in some amplifier, we can change the note of the sound for example half from it's current note (crest) or or reduce the note from half of it's current note (mol), i mean if we change the note, the sound would be changed too, for example a man's voice would change like a woman's voice if we increase the note. how to do this?
thank you for the reply
when i want to design an amplifier, i need to consider the frequency respons, the gain, the noise, the cost, the efficiency, and anything else, please tell me what are them?
when i want to determine the frequency respons, it's mean that i need to determine the bandwidth, please tell me how to find the bandwidth? i need to know the high cut off frequency, and the low cut off frequency, and then the bandwidth is high - low, is it right? but how to count the high and low cut off frequency?
and about the noise, what point i need to consider about? and what should i do to reduce the noise? is it i can reduce the noise in the pre-amp stage, and then the output from the pre-amp go into the power amp, and ampilfied? in the pre-amp stage, we can change the bass, treble, midrange, volume, etc, why the noise reduced if it passed the pre-amp stage?
in the amplifier, there are many class of amplifier, like class A, B, C, D, etc, the efficiency between those class is different, and i heard that class A for voltage/current amplification, class B for impedance matching/buffer, class C and class D is more efficient, the class D could be used for subwoover, is it true? class C can be used for radio signal amplification, is it true? because in the class C has the LC for resonantor, is it true? what is the main purpose that we distinguish them into many class? is it just to distinguish their efficiency? or anything else? please tell me
in some amplifier, we can change the note of the sound for example half from it's current note (crest) or or reduce the note from half of it's current note (mol), i mean if we change the note, the sound would be changed too, for example a man's voice would change like a woman's voice if we increase the note. how to do this?
thank you for the reply
