spliter anti mixer

[Batz Goodfortune]

Y-ellow --M.

At 10:56 PM 02/13/00 -0700, --M wrote:
>    I had this idea that I need a module that takes a signal in and
>sends this out through several outs. Ideally it could work with CV and
>audio. Anyone seen a schematic for anything like this?

You mean a distribution amp?

Wish I had a scanner  right now. I could help you pretty quickly. Next week
maybe I'll have one.

In the mean time, though a picture tells a 1000 words, here's a bit of a
description.

You take an input amplifier/buffer (say an op amp) then you have that drive
as many output amps as you like. In essence it's that's simple. Usually
your input amp will be inverting but so will all the output amps. Which
means the signal you get out will be up the right way. But it's not
important. Just as long as the gain through the entire network is 1. IE:
you put 1 volt in you get 1 volt out of all outputs.

The only real difference between audio and CV (apart from errors and drift
which I'm sure some here will pull me up on if I didn't at least mention
it) is  that the audio is generally capacitively coupled while the CV is
direct DC.

In other words. You connect together a voltage follower circuit.

With audio you may not need distribution as such if the output impedance is
low enough. Usually a good op-amp will provide you with a very low output
impedance these day. Then you can just use a resistor on each output. CV
would be a little more tricky. Gain and transfer function are the key here.
To make sure you get  out what you put in.

As far as CVing the outputs, I'm not sure about for VCing a bunch of CV
outputs. there's probably an easier way for that. With audio you could
simply replace the output amps with OTAs. 13600/700/3080s etc. Make these
your inverting stage.  But once you do this, particularly where CV is
concerned, matching the transfer function VS some arbitrary control CV
level becomes the big issue. All this may or may not be important to you.

If noise is a big big factor for you with the audio, CV attenuation instead
of amplification work well. Because you are  attenuating the noise instead
of first amplifying by a factor of heaps. (The well known unit of measure
"Heaps" that is.)

Depending on what you want to do you might even get away with placing a FET
between two resistors and ground. Basically the audio comes in on a
resistor, gets shunted to ground depending on the voltage on the gate of
the FET. Then the output is isolated by another resistor.

You can do this with bipolar transistors as well but it's much harder to do
with out significant distortion.

But essentially you're after a distribution amplifier with a gain of 1.

Hope this helps.

be absolutely icebox.

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