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

Twisted Pear Superior quality electronic kits

Reply
 
Thread Tools Search this Thread
Old 6th November 2017, 08:23 PM   #21
thomaspf is offline thomaspf  United States
diyAudio Member
 
Join Date: Jan 2009
Location: Seattle, WA
Default Mercury and headphones

Since the IVY also can be used as a balanced headphone amp I wonder how the Mercury fares in this regard?

Cheers

Thomas
  Reply With Quote
Old 7th November 2017, 01:31 AM   #22
Russ White is offline Russ White  United States
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Quote:
Originally Posted by thomaspf View Post
Since the IVY also can be used as a balanced headphone amp I wonder how the Mercury fares in this regard?

Cheers

Thomas
Exactly the same. You can use it like IVY-III in that respect.
__________________
Less pulp more juice Twisted Pear
Audio
/Twisted Pear Audio Blog
  Reply With Quote
Old 7th November 2017, 02:07 AM   #23
thomaspf is offline thomaspf  United States
diyAudio Member
 
Join Date: Jan 2009
Location: Seattle, WA
If you have it at the top of your mind...

Can you remind us what the drive capability of the IVY at 16, 32, and 300 Ohms was.


Cheers

Thomas
  Reply With Quote
Old 7th November 2017, 11:34 AM   #24
Russ White is offline Russ White  United States
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Really as long as you live within the confines of the OPA1632 datasheet you will be just fine driving any headphone. The absolute max output current of the OPA1632 is 150ma - I would never try to push it much beyond 100ma though - so you just have to plan based on your intended load. For high impedance cans I give myself some extra voltage gain - for low impedance cans I sometime reduce the gain but usually leave it alone. If your cans need more than 100ma or so then I would use a separate headphone amp. I only have a couple of pair that need more - and they are special cases.
__________________
Less pulp more juice Twisted Pear
Audio
/Twisted Pear Audio Blog
  Reply With Quote
Old 22nd November 2017, 01:48 AM   #25
BrianDonegan is offline BrianDonegan  United States
diyAudio Member
 
BrianDonegan's Avatar
 
Join Date: Dec 2004
Location: TPA HQ (The Basement)
Introducing Mercury - Achieving escape velocity.
I just opened up pre-orders for v1.0, which will begin shipping the week of Dec 4th.

This is a picture of the jumper that needs to be added for the right-channel balanced output (about 12mm long):

Introducing Mercury - Achieving escape velocity.-jumper-jpg
Attached Images
File Type: jpg jumper.jpg (16.4 KB, 1164 views)

Last edited by BrianDonegan; 22nd November 2017 at 01:59 AM.
  Reply With Quote
Old 22nd November 2017, 07:47 AM   #26
wealas is offline wealas
diyAudio Member
 
Join Date: Apr 2017
It's out of stock already?
  Reply With Quote
Old 22nd November 2017, 07:56 AM   #27
wealas is offline wealas
diyAudio Member
 
Join Date: Apr 2017
Nvm, it shows up in stock if you wait a bit and refresh.
  Reply With Quote
Old 23rd November 2017, 07:57 AM   #28
Dimdim is online now Dimdim  Greece
diyAudio Member
 
Join Date: Sep 2008
Location: Athens
Introducing Mercury - Achieving escape velocity.
Instead of adding a jumper (which is a totally valid solution as well IMHO..) you could just scrape the green solder mask over the ground plane next to the ground pin and use a blob of solder to make the connection.
__________________
http://www.dimdim.gr
  Reply With Quote
Old 23rd November 2017, 11:45 AM   #29
Russ White is offline Russ White  United States
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Quote:
Originally Posted by Dimdim View Post
Instead of adding a jumper (which is a totally valid solution as well IMHO..) you could just scrape the green solder mask over the ground plane next to the ground pin and use a blob of solder to make the connection.
Indeed you could! We just thought the jumper method was easier for most folks to execute. Either method is fine.
__________________
Less pulp more juice Twisted Pear
Audio
/Twisted Pear Audio Blog
  Reply With Quote
Old 23rd November 2017, 11:52 AM   #30
Russ White is offline Russ White  United States
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Quote:
Originally Posted by cyrilliu View Post
When will the Version 1.1 of the Mercury be purchased?

I'm worried that adding a 12mm jumper at the right-channel balanced ground will cause unbalance between the left and right channels, affecting sound quality. If jumpers are added to both left and right channels, the problem is smaller.
No - the jumper absolutely wouldn't effect quality Balanced signals don't work like that. GND is not really part of the signal for a balanced output - all that really matters is that the shield has a single path back to GND.

In any case - 1.1 boards are ordered but it will probably be a couple of weeks before they are ready - in the meantime I would not let the jumper stop you.

Cheers!
Russ
__________________
Less pulp more juice Twisted Pear
Audio
/Twisted Pear Audio Blog

Last edited by Russ White; 23rd November 2017 at 02:17 PM. Reason: clarifying
  Reply With Quote

Reply


Introducing Mercury - Achieving escape velocity.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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
achieving constant directivity as low as 200Hz using really large drivers? CharlieLaub Multi-Way 53 28th January 2016 10:28 AM
Unconventional Techniques for Achieving Oustanding Stereo Imaging Elias Multi-Way 415 17th February 2014 03:49 PM
Help achieving correct phase response in active 3-way setup pk Multi-Way 2 19th June 2010 08:13 AM
Escape from UK London Blast chris ma The Lounge 2 8th July 2005 05:36 PM


New To Site? Need Help?

All times are GMT. The time now is 08:31 AM.


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