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Old 4th February 2005, 01:31 PM   #11
Electrons are yellow and more is better!
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Maybe you should try a Jung Super Regulator with a LM329 as voltage reference?

Just wondering, how low noise do you need?
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Old 4th February 2005, 02:26 PM   #12
claudio is offline claudio  Italy
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Hi Peranders,
the pre is a single stage cascode, so the lower the noise the better. The schematic is here: cascode thread

I have to choose between the Jung SR II (the one presented in 2000) that uses the LM329 as you said, or a classic series regulator. I don't need a negative voltage, but 33-36 Vout is needed.
Is the Jung SR II limited to 30 Vout, as your version of it (JSR 01) ?

Regards
Claudio
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Old 4th February 2005, 02:31 PM   #13
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The Jung Regulator itself is limited by max voltage for the used opamp, 36 volt normallly.
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Old 5th February 2005, 03:13 PM   #14
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Quote:
Originally posted by peranders
The Jung Regulator itself is limited by max voltage for the used opamp, 36 volt normallly.

if you need really, really low noise you can put 4 references in parallel --there was an application of this in Sep/Oct 2001 QEX in which 3 Thaler VRE305A references and chopper amplifiers were used to create an ultra low noise ref for a DVM --

Maxim has an application note where they use 4 voltage references in series, sum the outputs and divide.
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