Zen headamp. PCB, my ver. - Page 2 - 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 9th November 2009, 05:46 AM   #11
diyAudio Member
 
Join Date: Jul 2004
Location: Toronto, Canada
Thanks to STREAM for renewing my interest in this one enough to take a crack at the layout:

it's 2.0x2.5 inches or about 1/2 the size of the original
Attached Images
File Type: png Zen_HeadAmp_Board.png (38.2 KB, 628 views)
File Type: png Zen_HeadAmp_Sch.png (34.1 KB, 618 views)
  Reply With Quote
Old 9th November 2009, 09:58 AM   #12
Stream is offline Stream  Russian Federation
diyAudio Member
 
Stream's Avatar
 
Join Date: Aug 2008
Send a message via ICQ to Stream
Twitchie, nice looking layout.
I'm only worried about very long and thin track from V+ to first IRF.
Are You planning building this? And why IRF520?
P.s. Nelson Pass used some MKT(MKS) caps to bypass power and output in ZEN4 , maybe we should add them to this design too?

Last edited by Stream; 9th November 2009 at 10:05 AM.
  Reply With Quote
Old 10th November 2009, 05:58 PM   #13
diyAudio Member
 
tortello's Avatar
 
Join Date: Jul 2001
Location: Genoa (ITALY)
Hi Twitchie,
nice layout, but please consider that "high" bias currents need some copper: it is not necessary to oversize this aspect, you needc to calculate it correctly. In a quasi non-feedback circuit (few dBs....) even the current modulations can be heard through (sensitive) headphones. IMHO I don't see IRF520 very well in this circuit. It has been design around IRF610 types, with the 520s the frequency response will not be enought for a quality result.
As suggested, you can successfully defreat the bias modulation with slightly acoustic upgrade, but yuo will need to crank up the bias current to compensate. And yes, with my Grado's and my AKGs (701, 141M) I need gain too, if I want to connect the amplifier straightly to the Micromega CD setup outputs.

Good Work! : )

Marcello
  Reply With Quote
Old 11th November 2009, 06:20 PM   #14
diyAudio Member
 
Join Date: Jul 2004
Location: Toronto, Canada
Thanks for the comments Tortello and I should thank you as well for your original contribution

Sorry, I guess I should clarify - I've been on a diyAudio break with a new baby and my computer got reimaged so I just downloaded Eagle and it didn't have IRF610 so I just used 520 for the layout and pinout.

I was hoping for the feedback regarding trace widths. To be honest, I enjoy all aspects of diy equally so I may or may not ever etch this and even if I do, I may or may not get to populate it and even then ... you get the picture, but I do have fun all the way along.

I moved the layout around a tiny bit to make room for wider traces. I'll repost when I get enough time between diaper changes
  Reply With Quote
Old 11th November 2009, 06:33 PM   #15
diyAudio Member
 
tortello's Avatar
 
Join Date: Jul 2001
Location: Genoa (ITALY)
Hi Twitchie,
please etch, populate, and enjoy your amplifier, and if you want let me know what are you thinking about.
But only when your babies sleep, otherwise... enjoy your babies!!
If you can't have a selected set of 610s, please drop me your address: as time permits I will be very glad to send them to you.

Marcello
  Reply With Quote
Old 11th November 2009, 07:29 PM   #16
Stream is offline Stream  Russian Federation
diyAudio Member
 
Stream's Avatar
 
Join Date: Aug 2008
Send a message via ICQ to Stream
BTW, Tortello, thank You for article and design (:
  Reply With Quote
Old 12th November 2009, 09:42 PM   #17
diyAudio Member
 
tortello's Avatar
 
Join Date: Jul 2001
Location: Genoa (ITALY)
Hi Stream,
Thank you, you are very kind!
All the best

Marcello
  Reply With Quote
Old 13th November 2009, 04:18 PM   #18
diyAudio Member
 
Join Date: Jul 2004
Location: Toronto, Canada
I just noticed R4 is inline with R16 - can we get rid of R4?
  Reply With Quote
Old 13th November 2009, 05:57 PM   #19
Stream is offline Stream  Russian Federation
diyAudio Member
 
Stream's Avatar
 
Join Date: Aug 2008
Send a message via ICQ to Stream
Wow. I think nothing will be wrong without R4...
  Reply With Quote
Old 17th November 2009, 04:26 PM   #20
Stream is offline Stream  Russian Federation
diyAudio Member
 
Stream's Avatar
 
Join Date: Aug 2008
Send a message via ICQ to Stream
Tortello, can You confirm this?
  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
Downscaling Zen v.9 for use as headamp kenev Pass Labs 34 12th April 2010 02:06 PM
MC headamp with opa PTSOUNDLAB Analog Line Level 1 11th January 2008 10:56 PM
It's my AD815 headamp Kochkurov Maxim Chip Amps 16 11th May 2006 12:44 PM
Pocket pre-amp & headamp digi01 Chip Amps 11 10th October 2004 01:49 AM
headamp with pre-out [3pic] digi01 Chip Amps 2 24th September 2004 03:54 AM


New To Site? Need Help?

All times are GMT. The time now is 05:33 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