| Author |
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Jim Thompson
Guest
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 Posted:
Sun Dec 11, 2005 5:35 pm Post subject:
Re: The future of germanium ? ( diodes mainly ) |
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On 11 Dec 2005 03:05:36 -0800, meow2222@care2.com wrote:
| Quote: | Dave Moore wrote:
Actually, I'm planning to attempt to get the same
effects from generic silicon eventually.
Wherein, I expect to encounter
as with your suggestion, the same drawback, which is an
increased parts count and extended development time.
For some reason that I haven't yet taken the time to
understand, the schottky's introduce a rattling sound
when used in some of these circuits. Whether a damping
resistor will tame the abberrant carriers, dunno.
Time will tell I spoze and thanks to hurricane Katrina,
I have about half the time that I used to these days )`:
--DM--
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!
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Where do you get such misinformation?
[snip]
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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Guest
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| Posted:
Mon Dec 12, 2005 9:35 am Post subject:
Re: The future of germanium ? ( diodes mainly ) |
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Jim Thompson wrote:
| Quote: | On 11 Dec 2005 03:05:36 -0800, meow2222@care2.com 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?
[snip]
...Jim Thompson
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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.
NT |
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Jim Thompson
Guest
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| Posted:
Mon Dec 12, 2005 5:35 pm Post subject:
Re: The future of germanium ? ( diodes mainly ) |
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On 11 Dec 2005 23:58:33 -0800, meow2222@care2.com wrote:
| Quote: | Jim Thompson wrote:
On 11 Dec 2005 03:05:36 -0800, meow2222@care2.com 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?
[snip]
...Jim Thompson
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.
NT
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"...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.
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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