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Old 22nd August 2008, 05:00 PM   #21
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A few fav's:

Top ten ways to a better Aleph

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Hifizen's Aleph-X Official PCB rev. Alpha

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Last edited by Jason; 1st December 2009 at 01:23 PM. Reason: Fixed a link
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Old 26th December 2008, 06:08 PM   #22
elac310 is offline elac310  France
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Default ALEPH gain and gain adjustment

Aleph with 40db gain?

http://www.diyaudio.com/forums/showthread/t-1926.html

http://www.diyaudio.com/forums/showthread/t-800.html

http://www.diyaudio.com/forums/showthread/t-2008.html
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Old 20th November 2009, 02:14 PM   #23
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Hello Friends.
Just read all the post over here, and would like to give my sincere thanks to all of you for providing such a valuable links and information along with your
comments. Really there are lots of valuable download in this forum topic.
Thanks and stay connect.
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Old 12th October 2013, 03:40 PM   #24
12B4A is offline 12B4A  United States
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Here are some sticky suggestions:

F4 Power Amplifier
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Aleph J illustrated build guide
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Old 27th December 2013, 04:36 PM   #25
flg is offline flg  United States
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SemiSouthFan: Not that I know of. SemiSouth did not produce one and my research group has not needed to produce one either. A SJEP120R100 SPICE model could be modified with a little scaling.

But truthfully, none of these models do a good job with the curvature of the output characteristics (ID vs. VDS) near saturation, a problem no one has been able to fix using the core SPICE JFET model. So predicting amplifier linearity with the available models is not recommended. It is ironic that the gradual "knee" or transition to saturation of the output curves for the R100 was viewed by the power switching community as a curiosity indicating lack of maturity in the channel design. Silicon power MOSFETs have sharper transitions, which is a major reason, in my analysis, for why the IRF parts deliver higher THD than the SemiSouth JFETs. What is one man's poison is another man's nectar.

Gee, I could be a poet.

For power switching, modeling near saturation is not really needed so it just hasn't been a priority, despite a few tries with only partial success. I have a need for modeling the transfer curves at the corners of the safe-operating-area (i.e., at hundreds of volts on the drain) and a student will finish a Master's Thesis on this improvement soon. But DIY Audio folks don't operate in that part of the device SOA, so I would say the available models are mostly useful for checking the basic functionality of a dc bias circuit because threshold and transfer curve modeling at low drain voltage is pretty good, and maybe some general guidance on AC operation, but not much more.

If there becomes a bigger demand, I might arrange for work on the near-saturation model to see if we can make this a better representation of the true characteristics. Maybe as an undergraduate research project.
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Old 18th March 2014, 12:03 PM   #26
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Best electrolytic capacitors
dc filter
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