good +/- line-stage regulators (LT1033/LT1085 replacement?)

grayson · 6th June 2008, 05:20 AM

looks like LT is going to discontinue the LT1033 three-terminal negative regulator fairly soon. it's marked "not recommended for new designs" on linear's website. this paired with the LT1085 made for possibly one of the best power supplies for line-level audio short of more complex discrete designs like walt jung's super regulators. i've done some searching, but am finding a serious lack of high-performance negative regulators in the class of the LT1033 (none actually). anybody know of a good negative regulator, or a good positive/negative pair worth looking at? i'd like to stick with off-the-shelf IC regulators for this just to keep things simple and compact. thanks for any suggestions.

h_a · 6th June 2008, 11:16 AM

You can stick with your prefered LT1085!

Just use two positive regulators to build up a dual (+/-) power supply, like here

http://www.diyaudio.com/forums/showt...67#post1531867

This has indeed two advantages: usually the negative regulator has inferior specs than the positive one (like 7815 vs 7915), so using two positive regulators gives equal performance.

2nd you can buy twice the quantities of the pos. regulator and benefit from quantity price breaks.

In case of the LT1083 (7A) you can build up even a voltage regulated psu for power amps, now if that isn't cute...

Have fun, Hannes

dave_gerecke · 7th June 2008, 12:36 AM

Hello Grayson, I would have to agree with Hannes on this one. The other possibility being to stock up on the LT1033 now, while they are still available.

Peace,

Dave

P.S. Where here in Burlington are you? Drop me an email if interested in more local discussion of diyaudio!

grayson · 7th June 2008, 08:06 PM

hannes, dave, thanks for the suggestions. yeah, i think i'll go with the two positive regulators for this. pretty slick. no down sides that i can see since i was planning on building separate bridge rectifiers for the two transformer secondaries anyway.

dave, i'm in the redrock condos on austin drive. i'll be in touch if this project starts to come together. some local input would be great. thanks.

dave_gerecke · 8th June 2008, 03:51 AM

Hello Grayson, Sounds good. I don't have too many friends of mine that are interested in audio the way I am. In some ways they think I'm a little nuts. Hope to hear from you.
I live on Intervale Ave, so I'm not too far away.

Peace,

Dave

6th June 2008, 05:20 AM	#1
grayson diyAudio Member Join Date: May 2005 Location: burlington, vermont, usa	good +/- line-stage regulators (LT1033/LT1085 replacement?) looks like LT is going to discontinue the LT1033 three-terminal negative regulator fairly soon. it's marked "not recommended for new designs" on linear's website. this paired with the LT1085 made for possibly one of the best power supplies for line-level audio short of more complex discrete designs like walt jung's super regulators. i've done some searching, but am finding a serious lack of high-performance negative regulators in the class of the LT1033 (none actually). anybody know of a good negative regulator, or a good positive/negative pair worth looking at? i'd like to stick with off-the-shelf IC regulators for this just to keep things simple and compact. thanks for any suggestions.

6th June 2008, 11:16 AM	#2
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	You can stick with your prefered LT1085! Just use two positive regulators to build up a dual (+/-) power supply, like here http://www.diyaudio.com/forums/showt...67#post1531867 This has indeed two advantages: usually the negative regulator has inferior specs than the positive one (like 7815 vs 7915), so using two positive regulators gives equal performance. 2nd you can buy twice the quantities of the pos. regulator and benefit from quantity price breaks. In case of the LT1083 (7A) you can build up even a voltage regulated psu for power amps, now if that isn't cute... Have fun, Hannes __________________ fresh matched IRFP240/IRFP9240 fets \|\| AlephJ/JX-kits F5 transistor kits \|\| Burning Amp BA-1/2/3 transistor kits

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7th June 2008, 12:36 AM	#3
dave_gerecke diyAudio Member Join Date: Dec 2007 Location: Vermont	Hello Grayson, I would have to agree with Hannes on this one. The other possibility being to stock up on the LT1033 now, while they are still available. Peace, Dave P.S. Where here in Burlington are you? Drop me an email if interested in more local discussion of diyaudio!

7th June 2008, 08:06 PM	#4
grayson diyAudio Member Join Date: May 2005 Location: burlington, vermont, usa	hannes, dave, thanks for the suggestions. yeah, i think i'll go with the two positive regulators for this. pretty slick. no down sides that i can see since i was planning on building separate bridge rectifiers for the two transformer secondaries anyway. dave, i'm in the redrock condos on austin drive. i'll be in touch if this project starts to come together. some local input would be great. thanks.

8th June 2008, 03:51 AM	#5
dave_gerecke diyAudio Member Join Date: Dec 2007 Location: Vermont	Hello Grayson, Sounds good. I don't have too many friends of mine that are interested in audio the way I am. In some ways they think I'm a little nuts. Hope to hear from you. I live on Intervale Ave, so I'm not too far away. Peace, Dave

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