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Old 9th August 2004, 12:03 AM   #1
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Default LClock XO PSU

Hi,

I'm going to make a new PSU (including trafo) for my old LClock XO.
Although the clock must receive the cleanest PSU possible, I was always puzzled why LC-Audio was selling an unregulated PSU for this (at least at the time I bought this clock, around 1999).
So, what's the best option?

1. Unregulated: trafo + schottky diodes + caps.

2. Regulated: trafo + schottky diodes + caps + reg.

What reg?
Would a LM317 do the job fine?
I have some TL431s around here too.
Some better option?

For the diodes I have some here that I may use:
- MBR1100
- MUR1100
- BA159

BTW you can see the schematic of this clock posted by Lars here, posts #39 and 40:
LClock Schematics

Thanks
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Old 9th August 2004, 08:42 AM   #2
Pan is offline Pan  Sweden
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I thought the LClock used reg. on the clock board... no?

Maybe the latest models only..

/Peter
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Old 9th August 2004, 08:54 AM   #3
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Yes, Peter.
If you look at the XO schematic posted by Lars (link on my first post), it also has regulation on board.
The question is: dedicated PSU: regulated or unregulated?
I ask this because in some cases double regulation is not better.
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Old 9th August 2004, 11:29 AM   #4
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It seams that the PSU is still the same, and it looks like an unregulated one:

http://www.lcaudio.dk/com/hyperkit.jpg

Maby I don't need to use regs here...
I made up my mind: gonna make a regulated PSU, with two outputs, reg. and unreg. and compare.
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Old 9th August 2004, 12:32 PM   #5
Pan is offline Pan  Sweden
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"I made up my mind: gonna make a regulated PSU, with two outputs, reg. and unreg. and compare. "

That´s my man

Hehe, Carlos, yesterday I happened to scan thru the old "audible differences in amp" thread, you know the one which never wanted to end? haha so much fun I miss it!

/Peter
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Old 9th August 2004, 01:12 PM   #6
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You mean this one?
Blind Listening Tests & Amplifiers

This was an excellent thread.
I don't know what happened to Eric (MrFeedback).
I liked that guy...
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Old 9th August 2004, 01:37 PM   #7
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I'm using a KF50BDT regulator for my TCXO, the KF have a more "analogue" sound than those LM317 , 7805 and LT1086 that I've tried.

KF regulators...

http://www.premier-electric.com/files/STM/pdf/KFxx.pdf
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Old 9th August 2004, 03:14 PM   #8
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Default According to the clock-monks, you

especially need a low noise supply for a clock-circuit to perform its best.
A TL431 nor LM317 are not the regs I (a novice) would use in such application. An LT1086CT would be more my choice. You could also have alook at the power supply used in Elso's clock design
Would be nice to to know the strenghts/weaknesses of an offspring of the LC-Audio and KWAK clock (Possible name could be The LC-KWAK' clock )

Henk
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Old 9th August 2004, 03:29 PM   #9
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Hi Henk,

The Kwak clock has regs on board.
The Tent clocks too (XO2 and XO3).
The LClock too.

They are all different.
I just wonder why LC-Audio sells a dedicated unregulated PSU for their clocks?
Maby they found out that the regulation they have on-board doesn't need pre-regulation?
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Old 9th August 2004, 04:23 PM   #10
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Quote:
Originally posted by jameshin
KF regulators...
I didn't know those regs, thanks.
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