Penultimate Zen Power Supply - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 7th October 2003, 10:03 PM   #1
diyAudio Member
 
kilowattski's Avatar
 
Join Date: Aug 2003
Location: Long Island, New York
Default Penultimate Zen Power Supply

I have posted this question before without an answer, but I am building the Zen V4 and using the unregulated power supply shown in the article on the Pass DIY site. There is a bridge rectifier used to isolate the grounds between the two channels on the power supply schematic. Is this bridge rectifier absolutely necessary? What would be the consequences of leaving it out and making the analog grounds of both channels common.
__________________
-----------------------------------------------
Kilowattski
  Reply With Quote
Old 7th October 2003, 10:41 PM   #2
joensd is offline joensd  Germany
diyAudio Member
 
Join Date: Dec 2001
Location: Germany
The bridge rectifier connects ground to the chassis.
There are other methods you could use (for example 10Ohms NTC from ground to chassis) but Id definitely tie them together somehow. More suggestions are here. Just look for articles about grounding amplifiers or power suppplies in general.

The ground of both channels (not AC-outlet earth) are tied together anyway the suggestion being to connect them at the speaker outputs.
Just reread the article and youll find the passage.
Its on page 4 and starts with "If you construct...".
If you use only one transformer you only have one ground for both channels anyway.

Hope I got you right (and you me?).

Cheers
Jens
  Reply With Quote
Old 8th October 2003, 01:04 AM   #3
diyAudio Member
 
kilowattski's Avatar
 
Join Date: Aug 2003
Location: Long Island, New York
Jens,

Thank you very much for the link. After reading the Elliott Sound Products article on grounding, it has become crystal clear to me why that bridge rectifier is absolutely necessary. Thank you very much for drawing my attention to it.
__________________
-----------------------------------------------
Kilowattski
  Reply With Quote
Old 8th October 2003, 01:17 AM   #4
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Default so what is the "ultimate"

and to Kilowattski -- "what hump?"
  Reply With Quote
Old 8th October 2003, 01:46 AM   #5
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Quote:
Originally posted by kilowattski
... it has become crystal clear to me why that bridge rectifier is absolutely necessary...
You can just ground everything, but sometimes you end up with
some noise. With the Zen amps, this is not as much of a problem
as some others because their gain is pretty low anyway.

BTW, Kilowattski, where did you get Cyclotron guy's picture
and does he know you're using it?
  Reply With Quote
Old 8th October 2003, 03:32 AM   #6
diyAudio Member
 
kilowattski's Avatar
 
Join Date: Aug 2003
Location: Long Island, New York
Thank you for the reply Nelson. I saw no reason why I could not have just grounded each channel. What I really feel foolish about is that ground loops, hum and noise never entered my mind, whats left of it. After reading the article on the link that Jens posted I felt like a real schmagegge.
__________________
-----------------------------------------------
Kilowattski
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Penultimate zen psu arlekin Pass Labs 1 30th January 2006 11:07 AM
FS FT Penultimate Zen Board's jleaman Swap Meet 0 8th March 2005 08:17 PM
heater supply (xformer specs are 6.3V 2.5A) as supply for a power LED? jarthel Tubes / Valves 10 21st July 2003 02:30 PM
Penultimate Zen SNR? amo Pass Labs 6 15th July 2003 08:21 PM
Help with Penultimate Zen amp. Panelhead Pass Labs 3 30th December 2002 04:26 AM


New To Site? Need Help?

All times are GMT. The time now is 01:42 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2