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Old 6th March 2014, 07:12 AM   #1
diyAudio Member
Join Date: Aug 2012
Default ultra low noise PSU recommendations for VAS of the LME49830

Im trying to build a psu for LME49830 and would like to know how to get ultra low noise from the psu without using any valves.
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Old 6th March 2014, 07:18 AM   #2
S4m is offline S4m
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Join Date: Nov 2013
I think you need to know the necessary voltage first...
It starts from +|-20V and can handle +|-100V
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Old 6th March 2014, 07:34 AM   #3
diyAudio Member
Join Date: Aug 2012
I have various versions of the amplifiers to do from

+/-30v to +/-90v

to be precise..

1. +/- 33v
2. +/- 60v
3. +/- 90v

I was just checking these from TI http://www.ti.com/lit/ds/symlink/tps7a3301.pdf

that is applicable only till 33v but with micro volts noise so anything beyond that need to look at other sources any suggestions please
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Old 6th March 2014, 03:07 PM   #4
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
use a medium voltage Salas style shunt reg, or a high voltage series regulator of the Jung/Didden style.
regards Andrew T.
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Old 6th March 2014, 03:41 PM   #5
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Join Date: Aug 2012
thank you andrew. Actually Im more concern about the noise floor. As the supply noise itself will be in the order of milli volts. I have seen the TI product which states about the output noise being 16micro volts. It makes the solution attractive but only worried about the higher voltage solutions. I have a doubt that does the Jung/Didden circuit has lower noise in the order of micro volts?
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Old 6th March 2014, 04:01 PM   #6
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this one seems to do the job till 90V what do you say..
Linear Regulator (LDO) - Single Channel LDO - TPS7A4001 - TI.com
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