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Old 16th December 2011, 07:56 PM   #3661
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The 1N829 sadly costs a litte more.
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Old 16th December 2011, 07:58 PM   #3662
MiiB is offline MiiB  Denmark
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I agree....will post it tomorrow...then we have a chance to sleep on it

Joachim will you do a perfbofeard..or is it tooo complex for that..??

According to the nice sweedish work i belive theres are more options to tha zener...maybe 3 of theese could do a good figure if run at 5 mA

BCX55/C3V9 (0.5W 3.9V):
#1 @ 1mA: 1.7 1.8 1.7 1.6 1.6 uV
#1 @ 5mA: 1.1 1.1 1.1 1.2 1.1 uV
#1 @ 20mA: 0.94 9.76 0.84 0.79 0.77 uV
#2@1mA: 1.6 1.6 1.6 1.5 1.6 uV
#2@5mA: 1.2 1.1 1.1 1.1 1.1 uV
#2 @ 20mA: 0.97 0.78 0.86 0.76 0.77 uV

Last edited by MiiB; 16th December 2011 at 08:08 PM.
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Old 16th December 2011, 08:16 PM   #3663
sampler is offline sampler  Lithuania
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Guys, don't loose your sleep over that reference. I think even LM329 decoupled for low FC would do the job. At least it has well documented noise over BW in datasheet, so 5uV wideband is realistic with right decoupling.
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Old 16th December 2011, 08:23 PM   #3664
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I can build that, no problem. The PCB can be designed parallel . When i find problems i can report.
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Old 16th December 2011, 08:28 PM   #3665
FdW is offline FdW  Netherlands
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This is what I have. There seems to be 163MHz 1mV, but with the 'naked' circuit on the table I do think it is environmental. It is less than 1mV, right on the limmit of the scope.
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Old 16th December 2011, 08:38 PM   #3666
MiiB is offline MiiB  Denmark
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Wow....amzing...
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Old 16th December 2011, 09:09 PM   #3667
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Frans, what is the div/V?

Rüdiger
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Old 16th December 2011, 09:44 PM   #3668
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Onvinyl View Post
Frans, what is the div/V?

Rüdiger
2mV / Div
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Old 16th December 2011, 09:49 PM   #3669
hesener is offline hesener  Germany
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Quote:
Originally Posted by Joachim Gerhard View Post
I can build that, no problem. The PCB can be designed parallel . When i find problems i can report.
cool - this is progressing really fast. have time monday night to start working....
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Old 16th December 2011, 09:58 PM   #3670
MiiB is offline MiiB  Denmark
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This is where I'am Now..Freeze...

Think that PCB and Perfboard can comence...

Wrong designation on two helper transistors, all should be BC327-337

By the way, that buffer looks awesome...don't know what to call it.. driven diamond cascode..??

michael
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Last edited by MiiB; 16th December 2011 at 10:25 PM.
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