reverse engineering has always been legal as "common law" - only the absurd overreaching by software/media companies in DCMA has tried to change this
that's why patents exist - your only protection if your innovation can be discovered by inspecting legally purchased product
that's why patents exist - your only protection if your innovation can be discovered by inspecting legally purchased product
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Comming back to component choices the Fraunhofer Institute has released what they call
a silizium-carbite power transistor. They claim 50% less loss, very high speed and overload margin and temperature stabilty up to 600° celsius. The first amp with that transistor is the Progressive Audio A2. It is a 2 x 100W Class A integrated. It is also claimed that this transistor is mechanically very tough. I spare you the rave about the sound. SiC has a tetrahedric structure found in nature only in metheorites and vulcanic stone. It was used before as grinding powder. It´s Mohs hardness is 9.6 .
a silizium-carbite power transistor. They claim 50% less loss, very high speed and overload margin and temperature stabilty up to 600° celsius. The first amp with that transistor is the Progressive Audio A2. It is a 2 x 100W Class A integrated. It is also claimed that this transistor is mechanically very tough. I spare you the rave about the sound. SiC has a tetrahedric structure found in nature only in metheorites and vulcanic stone. It was used before as grinding powder. It´s Mohs hardness is 9.6 .
In English - Silicon Carbide? Not really new. Infinion is on their third generation process for SiC semiconductors: Silicon Carbide Schottky Diodes - NEW 3G now available! - Infineon Technologies All this does is further compromise the Fraunhofer Institute's questionable credentials. The origin of MP3 making audio claims?
Well, the Infineons are diodes and not transistors. I do not use MP3 much but it is the de facto standart even for musicians. A have a little band and we where searcing for a produces. The producer wanted the music on MP3 to listen in it´s car! That´s a matter of fact. Music for the masses is on MP3. I have not heard before that Frauenhofer has a queationable reputation.....For the majority of people MP3 sounds as good as CD. Not for me but when the bitrate is high enough i could fool you in a double blind test. As far as i know Fraunhofer has also much better algorithms but MP3 got famous. Masking is an intesting concept i think.
What is the crossover frequency and what do you like to crosover rrbadrike ?
What is the crossover frequency and what do you like to crosover rrbadrike ?
Infineon does have a VJFET :
SiCED | Switches
Nelson Pass also have SiC JFETs from SemiSouth in his First Watt J2.
Not sure who is first ......
Patrick
SiCED | Switches
Nelson Pass also have SiC JFETs from SemiSouth in his First Watt J2.
Not sure who is first ......
Patrick
> Not sure who is first ......
It was just a neutral remark / question, and not an accusation.
Someone is selling the SemiSouth for much less than 50USD at the forum.
http://www.diyaudio.com/forums/vendors-bazaar/164271-semisouth-sic-jfet-16-pc-shipping-now.html
I think the lower distortion comes from the much higher transconductance, much like UHC Mosfets (which costs much less, albeit difficult to get).
And with them asking for 20k Euro for a A2 (not even monoblocks) :
Progressive Audio A2 MKII - Vollverstärker - LOFTSOUND Hifi High-End Studio
one can afford quite a few JFETs from SemiSouth.
For me, paralleling 400 small signal JFETs sounds more fun.
Schönen Gruß,
Patrick
It was just a neutral remark / question, and not an accusation.
Someone is selling the SemiSouth for much less than 50USD at the forum.
http://www.diyaudio.com/forums/vendors-bazaar/164271-semisouth-sic-jfet-16-pc-shipping-now.html
I think the lower distortion comes from the much higher transconductance, much like UHC Mosfets (which costs much less, albeit difficult to get).
And with them asking for 20k Euro for a A2 (not even monoblocks) :
Progressive Audio A2 MKII - Vollverstärker - LOFTSOUND Hifi High-End Studio
one can afford quite a few JFETs from SemiSouth.
For me, paralleling 400 small signal JFETs sounds more fun.
Schönen Gruß,
Patrick
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After some research i found that the information i gave you is not accurate.
What Fraunhover was claiming is the world record in efficiency in DC/AC converters with 99.03% on Juli 29th 2009. The transistor they used is the bespoke SemiSouth so they are not the invertors as i thought. Sorry about this.
What Fraunhover was claiming is the world record in efficiency in DC/AC converters with 99.03% on Juli 29th 2009. The transistor they used is the bespoke SemiSouth so they are not the invertors as i thought. Sorry about this.
Are you sure you don't mean Corbumite?
Tranya.
Tranya.
Carbonite Star Wars (Encasing Han Solo)
Corbumite Star Trek (Protects the Enterprise, allegedly)
My local grocery store sells natural fertilizer for $2.99 for five pounds.
This means some beer is cheaper than ...
Or these web threads are extremely valuable.
I found an interesting resistor. It is a low noise precsssion thin film from Tantatum Nitride.
My measurement on the Tan film chip from Mouser showed pretty good performance at 1/4 rated power but much worse as power increased. I suspect they are good for higher values of resistance (10K or more) than most others, but for lower values I would try metal film in larger case sizes.
If anyone wishes to turn this into a PDF they have my permission for this site only.
Attachments
For me, paralleling 400 small signal JFETs sounds more fun.
I recently ruled out this idea when thinking about how the capacitance parallels up so high.
I recently ruled out this idea when thinking about how the capacitance parallels up so high.
Without actually doing the work I suspect there is a direct relationship between Rds on and capacitance whether in a single device or an array. Power dissipation would be the big hurdle.
Without actually doing the work I suspect there is a direct relationship between Rds on and capacitance whether in a single device or an array. Power dissipation would be the big hurdle.
Yes, there is a definate gm/C relationship that depends on process. I think the problem is just the huge C limits the applications. I have found the BF862 and 2SK222 to be the best I can find. I was told the 2SK222 is still in production and available in TO-92 for those that can not deal with SOT-23. It outdoes the 2SK170 in any low current application at 8pF for 10mS @ 1mA.
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