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Old 30th December 2011, 11:01 PM   #4001
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Salas View Post
1.2-1.2R CCS anyone?
Yes (as 1.2-1.2R CCS), it takes the shunt output as a reference for the ccs.

This one take the shunt output as a reference for the voltage source, that is used to feed the ccs.

Last edited by FdW; 30th December 2011 at 11:08 PM.
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Old 30th December 2011, 11:02 PM   #4002
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Originally Posted by Salas View Post
1.2-1.2R CCS anyone?
Why did you think I loved the idea.... I already know the benefits of such an arrangement
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Old 30th December 2011, 11:12 PM   #4003
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The 450 to 490 group lies within 10%. That is a very low spread. Much easier then matching J-Fets. I would also measure the BC327. I think that is what you will do too.
I would use the ones with the highest Hfe that match NPN-PNP for the input transistors.
That way we get a slightly higher input impedance and less Dc current into the cartridge.
That could be the 510 - 530 group. The middle ground from 450 - 490 can then be equally distributed in the current mirror and the house keeping.
Nice statistics program that you have !
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Old 30th December 2011, 11:19 PM   #4004
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Thank you Joachim... that is just what I needed.

I got Minitab for my six Sigma Green Belt project. It has numerous possibilities.
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Old 30th December 2011, 11:21 PM   #4005
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Here is a nice collection with circuits where you can use BC327-337 that did not match :101 - 200 Transistor Circuits
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Old 30th December 2011, 11:25 PM   #4006
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Here is some more basic information :Beginners Guide
Sorry, it´s VERY basic so please do not feel insulted.
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Old 30th December 2011, 11:28 PM   #4007
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über pdf thank you again

I am never insulted when someone offers me free true info
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Last edited by RCruz; 30th December 2011 at 11:34 PM.
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Old 30th December 2011, 11:42 PM   #4008
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Does anybody know when the BC327/337 have being introduced ? They seem be to around for a long time. The only reliable information i found is that they are recommended over the BC550/560 at higher collector current, say 100mA, where the BC550/560 are not so good any more. The only mentioning of their low noise capability was in a paper by Janacec.
I hope that i spelled his name right.
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Old 30th December 2011, 11:47 PM   #4009
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Actually his name is Janasek.
http://www.janascard.cz/PDF/Ultra%20...amplifiers.pdf
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Old 30th December 2011, 11:47 PM   #4010
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I do remember them from certainly more than 30 Years ago. But that doesn't make them really old for a transistor (but that makes me somewhat old ).
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