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Old 8th October 2012, 08:09 AM   #1
diyAudio Member
Join Date: May 2011
Default preamp and active filter for class AB amp

Hello, i know that there is similar topics, but every way is unique. So i want you guys to help me a little bit.
I am trying to build my own class ab amp with lm3886. I know that lm3886 input is about 0.7V, and my preamp input range is 0.2V to 4V. It has flat mode and 4th order LPF.
So first time i routed pcb for unknown reason one of 3 preamps is broken. Now i am starting again, so i want you to help to fix problems.
First of all: smd are better for audio or it's ok with typical resistor?
When i finish routing could you help my to fix that it would be good for sound ?
thank you for understanding and help.
sorry for my bad English

Circuit which i use for amp is here: : Elektronikos projektai
Circuit which i use for preamp is here:

How's the first look?

Last edited by torress1990; 8th October 2012 at 11:30 AM.
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