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Old 17th December 2012, 05:35 PM   #8121
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What is difficult with a BJT singleton input is DC coupling to the cartridge. Nevermind.
This is cool :http://www.elv-downloads.de/Assets/P...r_Guide_um.pdf
It comes with a graphics display now that shows the I/U curves. Very good to find transistors with high early voltage. I will buy one.
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Old 17th December 2012, 05:37 PM   #8122
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Regarding the Peak: let us know your findings. I was also already peeking at this beast.

Mike
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Old 17th December 2012, 05:38 PM   #8123
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What is feasible is to make the input differential balanced with BJT´s.
That way we can DC couple and with BJTs 0.5nV/qHz is possible.
I will show a circuit soon. It is shown in Tietze-Schenk and has a lot of advantages.
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Old 17th December 2012, 05:41 PM   #8124
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Joachim Gerhard View Post
What is difficult with a BJT singleton input is DC coupling to the cartridge. Nevermind.
This is cool :http://www.elv-downloads.de/Assets/P...r_Guide_um.pdf
It comes with a graphics display now that shows the I/U curves. Very good to find transistors with high early voltage. I will buy one.
Now this one is really cool.... I want one
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Old 17th December 2012, 06:08 PM   #8125
MiiB is offline MiiB  Denmark
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I like that idea.... The LTP is back..
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Old 17th December 2012, 06:41 PM   #8126
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Sure, that is the way to go. We have then one stage plus balanced plus DC coupled, that is what we all want.
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Old 17th December 2012, 07:22 PM   #8127
MiiB is offline MiiB  Denmark
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We could make the first stage between the legs...and then the base cut after the folding.
think we need current mirrors to have enough gain for a One Stage
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Old 17th December 2012, 09:13 PM   #8128
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Quote:
Originally Posted by MiiB View Post
I like that idea.... The LTP is back..
As a newcomer I do not know what LTP means, probably Long Tailed Pair?

Anyway, when I seach this thread for LTP I arrive at a very early page 3 years ago:
Mpp

This is way back when I was not yet introduced to Master Joachim,
but I certainly could comment on the structure shown there, but it may be off topic,
agree?
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Old 17th December 2012, 09:43 PM   #8129
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Please commend on that structure. What post number was that actually.
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Old 17th December 2012, 09:56 PM   #8130
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I found it, post 42, that was a long time ago. I did also a balanced version of that one.
Post 42 has a little DC offset at the input that is the difference of the PNP and NPN Ube.
Could be solved by swapping the Ube transdiodes from one gender to the other.
The we have a PN NP drop on both polarities. Shunting the transdiodes with high value elcaps will lower the noise by 3dB.
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