[sdiy] Mixer levels

[mark verbos]

which reminds me of something I thought about a while back....

If you combine 2 signals from the same VCO, two different waves I mean, 
they can combine in phase with each other or out of phase, was we've 
discussed before. In some cases, you actually don't add to the voltage 
swing at all.

For instance, if you combine a short pulse, with a sine and they're out 
of phase you will have the sine intact, but with a rectangluar notch on 
one side. That notch willgo down to zero, but it won't add anything at 
all. Does this sound different than if that was a huge spike sticking 
off of the sine? I don't know. But one way uses up a bunch of headroom, 
probably clipping the mixer and the other wave uses the same amount of 
headroom as the sine alone.

Am I the only one who thinks this is wierd? do commercial synths use 
this to get mixes of waves that don't change the signal level going to 
the filter?

hmmm.

mark

Sowa Roman wrote:

>if there's 8 inputs, it's rather rare situation that all of them
>are at +10V at once. Usually some of them can be -10V,
>some -2, +3 ets, so the summ still fits in output range.
>But if you want them all, go ahead and build a mixer
>with +/-80V span. ;-)
>But who would want that? Mixer output will probably controll
>some other module, and even if it clips, it will be at so high
>voltage (say, 15V) that is beyond specified limits of controlled
>module input voltage.
>
>If non-attenuated signal is less desirable than clipping, use
>output fader. But it must be placed before output buffer,
>otherwise it will attenuate already clipped signal.
>Following input buffers' (if any) resistors, or in output buffer
>gain controll (e.g. feedback resistor).
>
>Roman
>
>__-----Original Message-----
>__From: Tim Ressel [mailto:madhun2001 at yahoo.com]
>__Sent: Friday, May 17, 2002 1:51 AM
>__To: Synth-Diy
>__Subject: [sdiy] Mixer levels
>__
>__
>__Hi gang,
>__
>__Okay, here's a question I've always wondered about:
>__How do mixers work? Specifically, I am curious about
>__how the levels work. Let's say you have an 8-input
>__mixer. If you have 8 +/-10V sigs, then it seems you'll
>__need some attenuation, or else the output will clip.
>__But if you have only 2 inputs live, you'll need less
>__attenuation. Is this handled by the output fader?
>__
>__--TR
>__
>__
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