[En-Nut-Discussion] Problem connecting analog sound on port F

[jakub nowak]

Please read topic from last week: "U R G E N T !!! Ethernut 1 -using PORTF".
First check Your fuse bits, if you have new atmega the JTAG is on, so
you can't use half of PORTF.If You want to use this port in100%, You
have to change three fuse bits JTAG,OCDEN and M103C. All of them
should be not programmed =1(not programmed in fuse bits =1 programmed
=0).
I hope this will help You.
JDN

2008/3/11, Vincent Timmerman <vincenttimmerman at gmail.com>:
> Hi,
>
>  I want to connect an analog signal to my Ethernut 1.3H board. When I do, the
>  analog signal turns into noise. When not connected, it's a good signal.
>  The board I want to connect to my Ethernut, is a standard mic-amp circuit (
>  http://www.rason.org/Projects/hbmic/mikschem.gif). The circuit works perfect
>  when it's not connected to ethernut. I connect the output and the ground to
>  channel0 of the ADC.
>
>  To my opinion, this is a hardware problem, because it doesn't matter if the
>  program is running or not, the output of the opamp gives noise when
>  connected to Ethernut.
>  Anyone a clue what I'm missing?
>
>  Vincent
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>