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The future of germanium ? ( diodes mainly )

D

Dave Moore

Jan 1, 1970
0
: Jim Thompson wrote:
: > On 11 Dec 2005 23:58:33 -0800, [email protected] wrote:
: > >Jim Thompson wrote:
: > >> On 11 Dec 2005 03:05:36 -0800, [email protected] wrote:
:
: > >> >Silicons have the same nonlinear effect as Ges, but it occurs over a
: > >> >small V range with a large V offset added, making it much tougher to
: > >> >use for audio distortion than ge. Biasing them with a constant current
: > >> >might help, but you've got 2 diodes to bias with 2 different Vs to get
: > >> >symmetry. I'd stay with ge!
:
: > >> Where do you get such misinformation?
:
: > >which bit specifically? Ge diodes dont have the Vdrop that silicons do
: > >at low v, and can be used unbiased for some apps. And are, or were.
:
: > "...tougher to use for audio distortion..."
: >
: > TC'ing a Si transistor with Si diodes is no tougher than TC'ing a Ge
: > transistor with Ge diodes, EXCEPT the Ge will probably thermally
: > run-away in spite of your efforts.
:
: I gues we were thinking of 2 different things then. Ges can be used
: back to back in an opamp circuit to give a nice nonlinear effect, with
: no bias. I dont know exactly what the OP's doing, thats just the usual
: design I've seen.
:
:
: NT

Well, since you let the cat out of the bag. Yes indeed, that's one
of the things I'm doing, using Ge's back to back.
I wasn't aware that it's been done before however.
HopefullyI've found some new ways to use them
The range of things that can be sonically done with them
and with "elegant simplicity" is most impressive.
Welcome to the whacky world of guitar FX design
where the worst parts are sometimes the best :)
 
D

Dave Moore

Jan 1, 1970
0
: Tim Williams wrote:
:
: > I recently saw mention that Intel(?) was going to try indium antimonide. I
: > looked up the bandgap and it's lower than Ge, as you'd imagine. I don't
: > know what the hell they're thinking...
: >
: > Tim
:
: very low voltage for power saving? Would have many uses in computers
: etc. Ge tr circuits can run happily on 0.5v supplies.
:
: NT

Perhaps they were thinking of me and my never ending
quest for sonic signature devices :) Naw

BTW, are any of those ancient back to back Ge
circuits posted anywhere online for viewing?

I'd be curious to see that I don't reinvent the wheel.
Though I don't think I am as I've never heard any
musical FX recordings that sound quite like what
I'm doing, which goes a ways beyond simply slapping
a pair of back to back Ge's on an op amp.
 
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