Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

Zen Variations 3 - Questions
Zen Variations 3 - Questions
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
Thread Tools Search this Thread
Old 22nd May 2002, 07:08 PM   #1
vpharris is offline vpharris  United States
diyAudio Member
Join Date: Dec 2001
Location: Philadelphia
Default Zen Variations 3 - Questions

Questions on Zen Variations- Part 3

I plan to build this, and am awaiting some parts. However, I would like to understand the operation and performance better before I assemble it. I really plan to build an Aleph, but I thought that this would be worthwhile as a learning exercise to do first.

Questions on the Modulated Regulator: See: http://www.passdiy.com/projects/zenv3-4.htm

1) I understand the basic idea of Ďbendingí the gate voltage of Q5 upward with a positive swing of the output signal. Initially I thought if the regulator nominally puts out 40v and the zener stack provides a 44v reference, then the amplifier output must rise above 44v before the connection through R25 pulls the gate reference up, which seemed impossible.

Looking again, I think I get it. The amp output is AC coupled to the regulator reference, allowing a portion of the output signal to ride on top of the DC reference. Right?

If so, how do I evaluate how much signal will be there? Itís got to do with R23 / 24 /25 and V=IR but I canít quite get my hands around it.

2) NP mentions that with the modulated regulator the DC at the output of the amp rises to 23 volts from 20V. I havenít seen any other components in the current source or gain stage change. How does the voltage rise? Iím guessing that re-adjusting potentiometer P1 does this. Correct?

Vince Harris
  Reply With Quote


Zen Variations 3 - QuestionsHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Temp Variations CH to CH Zero Cool Everything Else 0 4th February 2007 01:25 PM
Questions/ideas on variations on BSC bi-pole config DeonC Multi-Way 9 31st January 2006 11:51 AM
testing variations jimbo1968 Chip Amps 3 5th July 2005 07:41 PM
Q: The Zen Variations Book Michael Rothacher Pass Labs 5 5th March 2004 05:14 PM
Zen Variations 5 Nelson Pass Pass Labs 66 5th August 2003 04:57 PM

New To Site? Need Help?

All times are GMT. The time now is 05:20 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio