Diodes Was: Re: opinions on HIFLI...

[Rene Schmitz]

At 09:59 16.04.1997 +1000, you wrote:
>
>>Yep, germanium.
>>
>>But I wouldn't say that it does not work with silicon, since the principle
>>of variing the dynamic resistance is the same as in the phaser!
>>There are silicon diodes with an almost as round voltage/current plot as
>>germanium diodes.
>>I didn't know this till I measured it in my electronics course here at
>>uni-bonn. The edge is not that sharp as one usually assumes.
>
>There is a voltage drop difference however, with silicon at around 0.6v and
>germanium at 0.2v, though I do have some germanium that measure 0.1v drop.
>
>>There seems to be more interest in how I did that trem, than in that
phaser ;-)
>
>Info on either is interesting :)
>
Yes, sure!

Therefore I crossposted to the list

And you're right about that voltage drop. The situation here is different,
you control the current. You don't care about the voltage drop.
There are Ge and Si types whose U/I curves seem the same but only 400mV
shifted apart. The principle was the dU/dI (dynamical resistance) varies
with the current. And the forward voltage drop doesn't matter, since it 
disappears when differentiating. We're after dU and not U.

Hope this makes sense!