LM3886 works in a few seconds then it shut off.

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It looks like the regulator is folding back as it is running too hot due to SOA limits being crossed. The heatsink also may be a problem. Instantaneous current ability of the chipamp may also create problem. It is better you connect the capacitor after the regulator even if it does not improve sound.

Gajanan Phadte
 
It looks like the regulator is folding back as it is running too hot due to SOA limits being crossed. The heatsink also may be a problem. Instantaneous current ability of the chipamp may also create problem. It is better you connect the capacitor after the regulator even if it does not improve sound.

Gajanan Phadte

Maybe you little not read up - everything with regulator works fine the problem lying in to big capacitor on adjust pin (solved in other topic). Now I just asking about supply decoupling after regulator. You prefer to connect the capacitor on regulator out pin what value will be the best? I tryied 470uF and 1000uF and sonically it was worse than without maybe 100uF -200uF?
 
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