Hi!
I am designing an audio mixer for my stereo at the moment, but
have run into some problems. Maybe somebody here can help me:
Can anyone here provide hints or schematics for using the Philips
chip TDA1074A as a channel fader?
Alternatively, suggestions for other circuits that will do the same
would also be helpfull...
Here is a description of what I am trying to do:
To avoid problems with the "cheapo" potentiometer sliders I want
to use for the faders, I wanted to let a TDA1074A do the fading and
the potentiometers just deliver a control voltage.
From the information in the datasheet, this task is just what the
TDA1074A is designed for, but I am having troubles getting it to work.
At the moment, it is connected in the manner suggested in the data
sheet, but the control behaviour is quite different from what I
expected: I can't fade a signal down to zero (the whole lower half
of the fader range has only little effect on the signal), while there
is a steep rise of signal level at the upper end (plus there is a
noise when fading to the upper end, but that might be caused by
the potentiometer).
What I'd like to get is a logarithmic or linear curve from zero
(- infinite dB) to 100 %.
Bye and thanks in advance,
Hannes
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