Using regulators on the Aleph Driver board

Mark A. Gulbrandsen · 3rd January 2003, 03:36 AM

Has anyone attempted to do this.....just regulating the driver board B+ and B- while leaving the current source and output stage on the rails???? Just curious what this might do to the character of the amp. I would think the S/N would be alot better. If this is at all possible.....
Mark

roddyama · 3rd January 2003, 04:34 AM

Mark,

Here’s an early thread where they talk about regulating the rail voltages with comment from Mr. Pass.
Aleph Mods

Here’s another where the subject of regulation is discussed briefly along with other noise reducing ideas including extra filtering for the front-end rails. This thread is where HH introduced the LM329 front-end current source (now known on the forum as the HH CCS).
Pass' amps way too noisy?

This is an interesting subject. I hope other will provide input to this thread.

Rodd Yamashita

GRollins · 3rd January 2003, 04:39 AM

It can be done, but would be backwards in a sense. A differential has a built-in immunity to noise and such (CMRR) on the rails, whereas the output has comparatively poor CMRR.
Of course, you could argue that anything that manages to effect the front end will be amplified more than anything in the output stages.
If you build a separate rail for the front end I'd suggest leaving it on all the time. It only draws a watt or two and the amp would be that much closer to being warmed up.

Grey

Peter Daniel · 3rd January 2003, 06:29 AM

You can also check this: Aleph's front end separate power supply

3rd January 2003, 03:36 AM	#1
Mark A. Gulbrandsen diyAudio Member Join Date: Sep 2001 Location: Salt Lake City	Using regulators on the Aleph Driver board Has anyone attempted to do this.....just regulating the driver board B+ and B- while leaving the current source and output stage on the rails???? Just curious what this might do to the character of the amp. I would think the S/N would be alot better. If this is at all possible..... Mark

3rd January 2003, 06:29 AM	#4
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	You can also check this: Aleph's front end separate power supply __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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3rd January 2003, 04:34 AM	#2
roddyama diyAudio Moderator Emeritus Join Date: Jan 2002 Location: Michigan	Mark, Here’s an early thread where they talk about regulating the rail voltages with comment from Mr. Pass. Aleph Mods Here’s another where the subject of regulation is discussed briefly along with other noise reducing ideas including extra filtering for the front-end rails. This thread is where HH introduced the LM329 front-end current source (now known on the forum as the HH CCS). Pass' amps way too noisy? This is an interesting subject. I hope other will provide input to this thread. Rodd Yamashita

3rd January 2003, 04:39 AM	#3
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	It can be done, but would be backwards in a sense. A differential has a built-in immunity to noise and such (CMRR) on the rails, whereas the output has comparatively poor CMRR. Of course, you could argue that anything that manages to effect the front end will be amplified more than anything in the output stages. If you build a separate rail for the front end I'd suggest leaving it on all the time. It only draws a watt or two and the amp would be that much closer to being warmed up. Grey

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