variable resistances (Re: [sdiy] Multi-Input filters)

[ASSI]

On Wednesday 12 February 2003 16:12, Roman wrote:
> there's even a parameter specified for zeners, called dynamic
> resistance, that says what resistor would be connected to ideal
> brickwall zener to have response like real zener. And it changes with
> current. Personally I'd pick small zeners from 2V7 - 3V6 range. They
> have smoother knee, and should be easier to use.

Zener diodes (or any junction in breakdown mode) are really noisy (so 
much that they're some of the best noise generators you have around). 
If you don't need a large voltage drop on them, run from them as fast 
as you can and use forward biased diodes instead. If it's just the low 
voltages you mention, you may try one or two LED instead. I don't 
really know what their noise properties are, but at least they should 
not be worse than Zener diodes.


Achim.
-- +<[ Q+ & WAVE#46 & microQkb Omega sonic heaven ]>+ --

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