I havent had much experience with audio circuits, so i thought id jump in and have a go. Its much tougher than i though it'd be and i have sooo many questions, be glad of the help!
I have a speaker that is 8ohm (0.3W) - using v^2/R - will that give me the Maximum RMS voltage i can apply to the speaker? This must be AC coupled to the speaker so that no DC passes to it, because that heats up the coil and may damage the speaker right?
Ive read, from the way the speaker works, that its just a coil moving in the magnetic field of an armature magnet, so is this 8ohm, just the DC resistance of the coil, or.. the AC reactance of the coil? If thats the case, i thought this inductor (because its a coil?) is a function of frequency how can it be fixed at 8ohm? - i read a few posts that suggest that this changes at resonance or something!
Lots of the circuits ive seen on the net have mentioned alot about Class A and Class AB operations. So from what ive read, you can tell a circuit is Class A because the output transistors are on all of the time, and Class AB if one transistor is one during the positive of the cycle, and the other is on during the negative - as in a push pull output stage - is this right?
Im trying to simulate amplifier circuits, but im not sure what to use as the input, im not sure how to model 'sound'. I understand its a mixture of frequencies 20hz - 20khz, and will have a maximum voltage depending on the type of input. Can i just use a sinewave input at these frequencies to simulate my circuits, or do i need to take anything else into account?
I know if you pull too much current out of a battery its voltage drops, so how do i get around the problem of supplying power to an output speaker rated at 300mw, can a 9v battery do that? Is there a minimum power i can deliver from a battery and i should choose lowered powered speakers to make sure the rail doesnt drop - or use big capacitors across them to hold them tight?
Thanks for any help or points in the right directions.
Megamox
I have a speaker that is 8ohm (0.3W) - using v^2/R - will that give me the Maximum RMS voltage i can apply to the speaker? This must be AC coupled to the speaker so that no DC passes to it, because that heats up the coil and may damage the speaker right?
Ive read, from the way the speaker works, that its just a coil moving in the magnetic field of an armature magnet, so is this 8ohm, just the DC resistance of the coil, or.. the AC reactance of the coil? If thats the case, i thought this inductor (because its a coil?) is a function of frequency how can it be fixed at 8ohm? - i read a few posts that suggest that this changes at resonance or something!
Lots of the circuits ive seen on the net have mentioned alot about Class A and Class AB operations. So from what ive read, you can tell a circuit is Class A because the output transistors are on all of the time, and Class AB if one transistor is one during the positive of the cycle, and the other is on during the negative - as in a push pull output stage - is this right?
Im trying to simulate amplifier circuits, but im not sure what to use as the input, im not sure how to model 'sound'. I understand its a mixture of frequencies 20hz - 20khz, and will have a maximum voltage depending on the type of input. Can i just use a sinewave input at these frequencies to simulate my circuits, or do i need to take anything else into account?
I know if you pull too much current out of a battery its voltage drops, so how do i get around the problem of supplying power to an output speaker rated at 300mw, can a 9v battery do that? Is there a minimum power i can deliver from a battery and i should choose lowered powered speakers to make sure the rail doesnt drop - or use big capacitors across them to hold them tight?
Thanks for any help or points in the right directions.
Megamox