Shawn

Thx for the suggestion. Seems like I real need a softstart borad to built.

haha it seeems like a little bit overkill... i agreed but the price between 200VA/100VA is almost the same. same price more weight🤣

Thx Pars. Actually, i did`t ask the question clearly😑 My apologize. It`s the one in CFA Board near the VCC+- terminals.

Another CFA3 here to be built: The transformer i used is from Antek with 200VA 25V for each channel. Still waiting for the rectifier bridge.d which probably will arrived tmr. Hope i can power it up tmr ASAP, can`t wait to enjoy it. BTW, any help about the trimmer resistor near the VCC+- terminals. What`s it used for?