hi guys, first of all I beg your pardon for my poor english,
I started mounting an amp4, and soldered all the surface mount components, the 9v and 5v tests were fine, so far so good.
so I mounted all the hole-through components, and after closing J10 the tripath main chip (tk2050) started to smell and runs HOT, quickly unpowered the board (btw I use an old AT trafo from a pentium1 pc connecting the +12 and -12 to ac1 and ac2, all went fine since now) and discovered that the 2,2k r59 was burned, got a new 2,2k connected the +5v(trafo) to ac1(board) and gnd(trafo) to gnd(board)... and the 2050 still was overheating and... r59 was again burned with only 5v!!!
All the smt components are soldered pretty clean
both chips are again well soldered (after the overheating could the 2050 be burned?), checked and re-checked many times
The amp is nearly finished i have to mount only the nmos and pmos (q4, q5, q6 and u10, u11, u12)
My board is rev 1.1 and I mounted the voltage supervisor straight (not rotated 120deg counterclokwise)
I used Rin 20Kohm (r21 and r29) and Rfeedback 49,9Kohm (r23 and r31) as I'd like to use a 50K pot as read in the instructions.
Any suggestions, tips, miracles?