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

Headphone Systems Everything to do with Headphones

Marsh headphone amp from Linear Audio
Marsh headphone amp from Linear Audio
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 August 2012, 01:21 AM   #441
RNMarsh is offline RNMarsh  United States
diyAudio Member
 
RNMarsh's Avatar
 
Join Date: May 2012
Location: 2457 Cascade Trail; Cool, CA. 95614
Marsh headphone amp from Linear Audio
Quote:
Originally Posted by sonidos View Post
Here is what I've concocted. Funny, but after putting the rat's nest together, it all started to take shape just like Mr. Marsh's board.
I did mine all manually. Interesting similar results -- there must be 'rules' the auto feature goes by which are similar to what I learned.
  Reply With Quote
Old 9th August 2012, 02:16 AM   #442
sonidos is offline sonidos  United States
Libertador de la Música
diyAudio Member
 
sonidos's Avatar
 
Join Date: Jul 2007
Location: Round Rock, TX
Marsh headphone amp from Linear Audio
Quote:
Originally Posted by RNMarsh View Post
I did mine all manually. Interesting similar results -- there must be 'rules' the auto feature goes by which are similar to what I learned.
It was all done manually. What I did was follow YOUR rules that you posted many pages back. I looked at your board and noticed how you followed the schematic. I then laid out the parts in random fashion and connected all the parts. It was pretty much a rat's nest! So I started moving all the parts around. When I pretty much had it completed, I looked at your board again and it was nearly a dup! It boils down to your explanations making good sense to me.
  Reply With Quote
Old 9th August 2012, 02:59 AM   #443
RNMarsh is offline RNMarsh  United States
diyAudio Member
 
RNMarsh's Avatar
 
Join Date: May 2012
Location: 2457 Cascade Trail; Cool, CA. 95614
Marsh headphone amp from Linear Audio
Thx for the feedback....
BTW - I always do a layout that looks like I am drawing the circuit on pcb. It is also easier to trouble-shoot against the schematic.
  Reply With Quote
Old 9th August 2012, 11:20 AM   #444
jackinnj is offline jackinnj  United States
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Marsh headphone amp from Linear Audio
Quote:
Originally Posted by sonidos View Post
Here is what I've concocted. Funny, but after putting the rat's nest together, it all started to take shape just like Mr. Marsh's board.
There's a feature in Ultiboard "Auto Parts Placement" -- for audio it's virtually unuseable since, as Richard points out, you have to keep the high current traces away from the small signal traces. You can use some aspects of this feature if you lock the high current and input components into place and it helps "intuit" where parts should go.
  Reply With Quote
Old 9th August 2012, 11:39 AM   #445
jan.didden is offline jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: The great city of Turnhout, BE
And of course, netlisting the schematic to the layout gives you automagically a ratsnest that's 100% identical to your schematic - no errors to chase.
Of course, if you make an error in the schematic, that is then faithfully transferred to the PCB as well..

jan
__________________
Cable: a potential source of trouble interconnecting two other potential sources of trouble - Erik Margan
Linear Audio pubs and articles . The SilentSwitcher now at diyaudio store SilentSwitcher. Keeping in touch with SY.
  Reply With Quote
Old 9th August 2012, 03:47 PM   #446
sonidos is offline sonidos  United States
Libertador de la Música
diyAudio Member
 
sonidos's Avatar
 
Join Date: Jul 2007
Location: Round Rock, TX
Marsh headphone amp from Linear Audio
all good advice...it would save me the QA time to make sure my boards are good and I don't smoke something $$$
  Reply With Quote
Old 9th August 2012, 04:54 PM   #447
RNMarsh is offline RNMarsh  United States
diyAudio Member
 
RNMarsh's Avatar
 
Join Date: May 2012
Location: 2457 Cascade Trail; Cool, CA. 95614
Marsh headphone amp from Linear Audio
Another thing i do during development/prototyping is put the ground plane or the shield plane on the bottom and the signal traces on the top. That, along with a schematic like layout, makes modifications and testing, probing and measuring easier.

These pcb ways make prototyping a new design easier and maybe trouble-shooting during development. Also, later if a part fails.... and for modifying the circuit... easy to cut trace and/or add something without tearing the pcb out and getting to the traces on the bottom.

-RNM

Last edited by RNMarsh; 9th August 2012 at 04:56 PM. Reason: pcb for easy mods and testing -
  Reply With Quote
Old 9th August 2012, 05:27 PM   #448
sonidos is offline sonidos  United States
Libertador de la Música
diyAudio Member
 
sonidos's Avatar
 
Join Date: Jul 2007
Location: Round Rock, TX
Marsh headphone amp from Linear Audio
I am doing my best not to reinvent wheels.

BTW, I bought more 2n5460 jfets. The ones I sourced from HK are mostly junk. I bought a small set from a guy in Florida that actually turned out pretty darn good and they don't tend to drift. The bad news is that he only had a few more left and I bought those up this morning.

I just bought 20 OnSemi 2n5457 that were recovered from some equipment. I'll have news if they are any good once I receive them.
  Reply With Quote
Old 9th August 2012, 06:11 PM   #449
jackinnj is offline jackinnj  United States
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Marsh headphone amp from Linear Audio
You can use the surface mount version of the devices MMBF5457 -- has a different pinout DGS
  Reply With Quote
Old 9th August 2012, 06:16 PM   #450
sonidos is offline sonidos  United States
Libertador de la Música
diyAudio Member
 
sonidos's Avatar
 
Join Date: Jul 2007
Location: Round Rock, TX
Marsh headphone amp from Linear Audio
yep, but I'm a dumb bunny sometimes. I noticed the power ratings are lower on these devices so i wasn't sure I could just pop these right into place (so to speak).
  Reply With Quote

Reply


Marsh headphone amp from Linear AudioHide 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
FS: Meier Audio Corda Headphone Amp jtwrace Swap Meet 5 29th February 2012 11:34 AM
Histoically significant - Phase Linear audio pre-amp bobcul Swap Meet 0 21st February 2012 08:16 PM
Headphone amp with mixed-in telephone audio krfjr1965 Solid State 3 10th March 2010 03:50 PM


New To Site? Need Help?

All times are GMT. The time now is 02:39 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki