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Old 30th June 2007, 03:26 PM   #1
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Default What is the best Regulator ?

Hello,

I want upgrading my DAC MSB by substitute the classical 7805 and 7812 with a new regulator, and I don't know what is the best solution ! In a first time I thinking use a LT317 with some résistor for the good voltage but I'm not sűre it 's the solution...

Please some one can help me ?

Thanks.
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Old 30th June 2007, 07:24 PM   #2
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I think almost anything will be better than standard 780x.

It depends also on the layout of your DAC. The LM317 series are good but require extra components. If that means you will have 15cm wires from the reg to the circuit, that's not good.

One simple and good solution would be replacement little pcb boards with the same pinout as the 780x but with a MUCH better regulator. Tentlabs is one of the people that makes them.

Jan Didden
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Old 30th June 2007, 10:35 PM   #3
Ryssen is offline Ryssen  Sweden
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Anyone have any experience with TL780-12/05?
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Old 1st July 2007, 11:03 AM   #4
dddac is offline dddac  Germany
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Quote:
Originally posted by janneman
I think almost anything will be better than standard 780x.

Anything is somewhat undefined and is most likely not true.

However, my experience is so far, that is alo depends heavily for what you use the power source........

To feed digital circuits with low power, I have had good results with 78xx followed by simple emitter follower an passive filtering

For analog, best findings comes with large Capacitors with low ECR close to the "user"

I use both 78xx and lm317 depending on outputvoltage needed. Best results come from filtering

doede
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Old 1st July 2007, 01:09 PM   #5
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Hello Jan,

Thanks for your answer, if I use a LT-317 I make a small PCB to keep the same place of the actual régulator !

I know about Tenlab and over, but I prefere buld my self...

Thanks,
Karim
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Old 1st July 2007, 06:11 PM   #6
tubenut is offline tubenut  South Africa
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I replaced the 78/7918 in my Electrocompaniet phono pre amp recently. Built LM317/337 on veroboard with about 4 cm lead outs going to the original holes.
I used zener diode and diode in series from adjust lefg to ground as per the acoustica suggestion. The subjective improvement is big. Deeper bass, better detail, more micro dynamics deeper wider soundstage. Stuff people would pay good money for if it were an equipment upgrade/change.
I know the "super regs" like Walt Jungs would be better but thy are far more complex and harder to put together on veroboard etc for low cost.

http://www.acoustica.org.uk/t/3pin_reg_notes1.html
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Old 3rd July 2007, 08:20 PM   #7
Ryssen is offline Ryssen  Sweden
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Quote:
To feed digital circuits with low power, I have had good results with 78xx followed by simple emitter follower an passive filtering
'Have you tested if there´s any difference between emitterfollower and a shunt?
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Old 5th July 2007, 06:20 AM   #8
dddac is offline dddac  Germany
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yes, tried tl431 shunt circuits. goes very well also. still the regulator, emittorfollower-filter solution scores better. Differences re not immense of course, but these were just somewhat better. always the same result: more open en detailed soundstage.

on analogue circuits things are somewhat different. Shunts work very good here, sometimes better, sometimes not. seems to depend what circuit is behind it. It is also no always doable to shunt when current is high (power losses etc). again, what always works is good filtering with high class components

doede
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Old 5th July 2007, 06:33 AM   #9
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Besides the Tent regulator you have two more alternatives.

http://www.hypex.nl/docs/hxr.pdf

http://newclassd.com/index.php?page=70
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Old 5th July 2007, 07:10 AM   #10
MaxS is offline MaxS  France
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Hello, Bonjour,

If my brain don't fail, Linear sell some LT108x with fixed output voltage ( 3,3 ; 5 ; 12 V ).
National sold them as LM108x.
I can't give you some advices about its audio-grade because I don't know it.
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