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-   -   preamp and active filter for class AB amp (http://www.diyaudio.com/forums/analog-line-level/221139-preamp-active-filter-class-ab-amp.html)

torress1990 8th October 2012 08:09 AM

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: CIRCUIT.lt : Elektronikos projektai
Circuit which i use for preamp is here: Zippyshare.com

How's the first look?


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