[sdiy] mixer

[harry]

Hi Glen...

Glen wrote:

> At 11:11 AM 11/2/01 , harry wrote:
>
> >The self-noise of the resistor is proportional to resistance, so the bigger
> >we make the resistor, the worse the noise gets.
> >
> >The trade is to use the lowest input resistor we can stand, that does not
> >interfere with the driving stage.
> >
> >H^) harry
>
> Thanks Harry. So I was basically correct?

Yes.

The question arises, can the driving stage er... drive 5K without too much
change in frequency response and  distortion ?

If yes... then 5K is good.

In my Hex Fuzz preamp (for guitar) I use 1K input impedance into a NE5534

Thats low... but it gives good noise performance, and I don't care about
high frequency response... in fact the worse, the better (does that make sense?)
:^P

H^) harry



> If one is only mixing typical, unbalanced line-level equipment, the noise can
> be reduced by using a lower input resistance on the mixer. Instead of 47K, I
> would probably use 5K, which I admit sounds extreme, but I'm very fussy about
> noise. Remember, this assumes that the input will always be feed with an
> unbalanced, line-level signal. If you need to feed this same input with things
> like electric guitars, or low-impedance balanced mics, then you will need an
> appropriate preamp to insert between the signal source and the mixing input.
> The original post mentioned nothing about guitars or microphones, but only
> line-level devices like synths and effects units. My suggestion should work
> well for those devices.
>
> Later,
> Glen

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