-=> Ben Ritchey said to All
 -=> about "I/F" on 12-21-02  17:05.....

 BR> I have a Stereo Audio feed for 2 Watts {at} 8 Ohms (per channel) that I
 BR> need to convert to "Line" level (I'm assuming this is around 1 Vac
 BR> Peak-to-Peak at a much higher impedance) in order to pass the signal
 BR> through an Equalizer, then back thru a secondary Amplifier (probably
 BR> 5-10 Watts per channel, not built yet). Can this be done with a simple
 BR> Voltage Divider like dual Pots and would the pot(s) need to be
 BR> Audio-taper? 

Yes it can. And since the pots are going to be preset, you can
use any curve.

I'm guessing the 2 watts at 8 ohms is the MAXIMUM rated output of
the equipment that you want to feed into the equalizer. This is
4v RMS.

"Line" level is probably about 1v RMS. You could probably reduce
the output of the source with its own volume control. Then you
just feed the output of the equipment straight into the
equalizer. If you want you can connect an 8 ohm resistor across
the output, but most modern equipment doesn't need this.

 BR> Are there any industry standard Audio Amp ICs that deliver approx.
 BR> 10W/RMS per channel I should use for the last stage? I have a couple of
 BR> National Stereo Amps (Lm4755) rated at 11W/channel with low
 BR> noise/distortion specs, I think. 

There are quite a few. TDA1520 is one I know.

 BR> I dismantled a very expensive TV to develop the Line-level outputs but
 BR> could only work out speaker taps (no schematic :( they go for over $50)
 BR> and cannot risk/afford to cause any damage by playing around . My
 BR> old TV had Audio/Line-out taps that sounded incredible through the
 BR> Equalizer. :)

These days it is very difficult to find a point to pick off the
signal without a schematic. In the days when the volume control
was done with a potentiometer, you could pick it off from the
input of the pot. but these days all the TVs use electronic
control. One IC looks very like another, so it's almost
impossible to find a suitable pickoff point without a "map".

From Greg Mayman, in beautiful Adelaide, South Australia

... Abuse a man unjustly and you will make friends for him. - Ed Howe
___ Blue Wave/386 v2.30

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