KrammeAcoustics wrote:
220 uF is rather small. Try to imagine you're thirsty, then you wouldn't choose a small cup, but instead a larger cup. I guess it's the best way i can illustrate it, to make you understand. ( Cola bottle = battery, cups = caps ).
i got some 4700uf 35v caps today and still there's distortion in low frequency. so, i think it might be something else that's causing the distortion. what else can it be? voltage is right at 12.4 - 12.8v with no noise whatsoever from the battery ps.
while assembling this particular one, i connected the PS wrong once and saw some smoke from either power-regulator or the transistor. it was just a few seconds and didn't seem to have damaged any of them....but do you think one of them might be damaged and causing the distortion?
i have put together another unit with fresh parts, and this time, i took extra care to not stress the parts too much with quick soldering and careful layout. thinking about building a separate power supply for this one, so it'll be a while until i can test it. if the new assembly has no distortion, i can conclude the first build's distortion as caused by power regulator or the transistor.
anyways, what do you think? can power regulator or the transistor be damaged and still function to pass great sound? other than low frequency distortion at high volume?