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Old 19th March 2006, 06:29 PM   #1
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Default Already have LT1085, should I switch to LM350AT?

I have a bunch of new, unused LT1085 regulators. I'm looking to build a better-than-average low noise, 5V / 3A linear PS. I have some circuit designs for the LT1085, but was wondering if the LM350 is a better regulator - lower noise across the audio band, better linearity, ripple rejection, etc - for use in a high end system. Or are these two outperformed by something better?
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Old 25th January 2016, 08:46 PM   #2
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Reviving this old post, I don't even know if the OP still is interested.

I have an old Welborne Labs PS8 power supply board powering octal
Aikido, by some reason the pre has bad hum in the output. I tried to figure out what's going on while trapped in snow, and noticed that the 6V filament supply produces buzz even without any load. I don't know if this is the cause of hum in the pre output, but it's annoying by any means. Attached is the schematic, and the U1 is LT1085.
Does anyone know if this buzz is from LT1085 and I should replace it with LM350AT or something else?
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File Type: jpg WL_PS8.jpg (600.3 KB, 127 views)
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Old 26th January 2016, 06:23 PM   #3
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Don't change the LT1085, it's more than good enough for this duty.
Buzz on the 6v line is probably because of dried-out caps C10, C11
Just replace them with same value /voltage rating parts.
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Old 27th January 2016, 01:52 AM   #4
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Thanks for the suggestion, I will try to swap C10, C11 with new ones. I have two PS8 boards and both make the same buzz. I wonder how those caps went wrong simultaneously. Maybe Welborne labs had bad supplier.
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Old 1st February 2016, 11:38 PM   #5
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I swapped C10 and C11 with new ones during the weekend and there still was some hum without load. I might have to get new LT1085s.
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Old 6th February 2016, 02:20 PM   #6
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I finally found out the problem. Welborne Labs PS8 board was purchased as assembled, and they did not insulate 1085 from the heatsink. That's not us amateur DIYers way, but maybe professional vendor's way?
I added insulation, and they are very quiet now.
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