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Old 5th September 2007, 02:41 PM   #61
Electrons are yellow and more is better!
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Can you elaborate your theories in practical terms? Have you actually designed a PS with 40 MHz bandwidth or more?

What do you mean "fast response time"? ns?

I have never seen a 100 MHz PS from China or anywhere, have you?
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Old 29th September 2007, 08:47 PM   #62
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Default newbie (ish) question

Hi guys

Have been modding a Marantz CD63KI for some time but get totally confused by all the conflicting advice on regulators.

I have installed 4 simple LM317 based 5v regs using small tants for decoupling on small individual boards directly next to load around the DAC/Decoder section, which is after the caps etc on the PCB.

I have seen banks of these regs built on a board at the edge of the CDP and fed by twisted wires to the load.

I want to use better regs but my budget and skills are limited, so I think I need to build LM317/337 based regs with gyrators and use better decoupling/smoothing caps.

Is it better to have the reg as close to the load as possible?
Should I connect the reg through, say Blackgates to the load, and if so should the cap be nearest the reg or the load?

Hope you can sort me out because I keep coming back to this and asking on other threads but no one seems to want to answer.

Thanks in anticipation.

Jim
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Old 30th September 2007, 10:30 AM   #63
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Default Re: newbie (ish) question

Quote:
Originally posted by jimh0612
Is it better to have the reg as close to the load as possible?
Should I connect the reg through, say Blackgates to the load, and if so should the cap be nearest the reg or the load?
Yes, better to have the regulator close to the load.

Caps: depends of the regulator. Look at the regulator datasheet for the type of caps to use. If you plan to reg digital, you can find many regulators better than the old LM317 (lower noise, faster transient).

Good luke.
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Old 1st October 2007, 08:58 AM   #64
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Thanks for that stef.

Any suggestions for replacements for the LM 317 for a 5v digital rail in a CD player?

Regards

Jim
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Old 1st October 2007, 09:24 AM   #65
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Quote:
Originally posted by jimh0612
Thanks for that stef.

Any suggestions for replacements for the LM 317 for a 5v digital rail in a CD player?

Regards

Jim

LT1086 (or LM1086) will be a good upgrade. Others exist but pinout will not be the same.

I'm not sure that you will listen a difference specially on the 5v digital rail.

.
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Old 1st October 2007, 06:36 PM   #66
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OK thanks for the advice.

Jim
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Old 20th January 2011, 02:04 PM   #67
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I ran the test again -- previously I had used 6V Alkalines -- this time a pair of motorcycle batteries:

Click the image to open in full size.
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Old 12th February 2011, 03:22 AM   #68
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Quote:
Originally Posted by jacco vermeulen View Post
A Sulzer is a ship diesel engine, i guess this thing does not regulate diesel engines.
Just re-reading this ancient thread -- actually a purring diesel engine ain't bad !
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Old 22nd February 2011, 10:31 AM   #69
alayn91 is offline alayn91  France
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Hello,

For those who are interested, the complete collection of "L'audiophile" is here:
- index

But, only in french.

Regards.
Alain.
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Old 22nd February 2011, 11:40 AM   #70
Electrons are yellow and more is better!
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Looks good but what is 0 dB? is it 1 V, 0.775 V or...?
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