voduychau

i want a site,or documents give me theory,formular,...ect...Because i want to learn how a speaker box work,and the wave appear in the box. I dislike DIY pages because it don't give me more information.

we often use library of an EDA software,but i don't like it,because it's not good for hand-made PCB so i design a new one,i'm using orcad layout plus now,any body can tell me your experience? -what padshape is good?(round,oblong,regtangular,oval...) -how width,how height of the pad is enough ? ...... please help me! (and please don't ask me "don't design it!" because i still want to design it ;D )