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Old 30th November 2012, 08:40 AM   #7781
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Yes, or something from Zetex. Paralleling works too.
I may ad a folded cascode to the input stage to raise output impedance.
Another option is a two stage design but then it is not so simple any more.
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Old 30th November 2012, 08:46 AM   #7782
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Something like this :http://www.diodes.com/datasheets/ZXT790AK.pdf
There is also an NPN and other types that are similar.
I think BD139, 140 would work as well.
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Old 30th November 2012, 08:59 AM   #7783
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Originally Posted by MiiB View Post
youre right, then the Css must deliver 50 mA.. putting some pressure on the cascode transistors.. dissipating 25mW/V... Think it may be advisable to find a TO126 or a TO220 transitor for the cascoding..KSA3503/KSC1381 could be a possible choice.
Why not a mosfet cascode with IRF610/9610 (or some thing). I have been doing testing with these and they are very usable for this purpose (and happy to disipate a bit).
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Old 30th November 2012, 09:02 AM   #7784
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Quote:
Originally Posted by Joachim Gerhard View Post
Something like this :http://www.diodes.com/datasheets/ZXT790AK.pdf
There is also an NPN and other types that are similar.
I think BD139, 140 would work as well.
Yes BD139/140 will do, they are fast have good Hfe and can disipate enough.
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Old 30th November 2012, 09:36 AM   #7785
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A depletion mosfet current source could be used too but i am not sure about the noise.
I know that the BJT current source is low noise though.
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Old 30th November 2012, 09:36 AM   #7786
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Originally Posted by RCruz View Post
That is nice, my tablet PC has the network name 'Colossus' (and it controls the Hifi/MediaCenter), I will have to see the complete movie (again) some time quick.
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Old 30th November 2012, 10:14 AM   #7787
RCruz is offline RCruz  Switzerland
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Originally Posted by FdW View Post
That is nice, my tablet PC has the network name 'Colossus' (and it controls the Hifi/MediaCenter), I will have to see the complete movie (again) some time quick.
I saw the movie more than 20 years ago and I was startled.

I was reading I Robot.... In those days I believe in the three laws:
1.A robot may not injure a human being or, through inaction, allow a human being to come to harm.
2.A robot must obey the orders given to it by human beings, except where such orders would conflict with the First Law.
3.A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.

But now "killer robots" appeared so these laws are purely Sience Fiction.

Now NASA is emulating brain activity with silicon....
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Old 30th November 2012, 10:33 AM   #7788
FdW is offline FdW  Netherlands
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Originally Posted by RCruz View Post
I saw the movie more than 20 years ago and I was startled.

I was reading I Robot.... In those days I believe in the three laws:
1.A robot may not injure a human being or, through inaction, allow a human being to come to harm.
2.A robot must obey the orders given to it by human beings, except where such orders would conflict with the First Law.
3.A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.

But now "killer robots" appeared so these laws are purely Sience Fiction.

Now NASA is emulating brain activity with silicon....
this here is a picture of Colossus at work
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Old 30th November 2012, 10:59 AM   #7789
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Nice panel !!!
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Old 30th November 2012, 11:13 AM   #7790
brianco is offline brianco  Ireland
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Is that the hand-held one light year model?
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