[sdiy] diode war

[Dave Krooshof]

>>BTW, using diodes and other stuff in feedback loop is
>>is 'goal of life' for my friend, Maciej Bartkowiak, who's
>>also on this list, I think. He's preparing to make some
>>killer synth using variable distortion.
Wow. I think can relate to that idea.

>You could make VCAs and VCFs with diode rings, why not VCOs and
>Envelope Generators with the same rings? Just a thought.
>all diode source of uncertainty......
Sounds enlighting, especially when done in leds.
:-)
But really, I've heard FM by now.
I've heard filters, as they are often the last one in the patch.
So I guess I need something new. I started to get a kick
out of leds and el cheapo opams like 301 and 709.

In my fuzz, I put a 500K log pot:
1. (left) outout of opamp and connected to the leds
2. (mover) 'from' the leds other side
3. (right) - input of opamp
It's a nice dial for edgeness, and it's doesn't change the
volume to much. With a light-red led and a transperant-blue one,
there's one position it goes absolutely mad. :-]

I cut the middle out of a opamp-foot, glued the two smooth
sides together, et voila, a led patchbay. Usefull.

>>I have an affection for zener diodes. I use them everywhere.
And they come with a diagram of their slope too.
With diodes, that's a guess.

>>Small voltage diodes, those below 5V trip point, have rather
>>smooth transition comparing to the 'bigger' ones.
Yes, that's what my books seem to call the 'downside' of
low voltage zeners. :-)

>>My tri-to-sine converter is made from 2 2V7 diodes.
So, you just smoothen out the triangle by softclipping.
That's a nice way of filtering. Should work a bit on any
signal with a fixed amplitude.

>>I used 4V3 (?) zeners in integrator feedback to prevent my
>>filters from going crazy when opamp clips.
And are they more or less a high cut 'filter' at loud levels?




DAve


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