Go Back   Home > Forums > >

Headphone Systems Everything to do with Headphones

X-Altra HPA-1 Class A Headphone Amplifier
X-Altra HPA-1 Class A Headphone Amplifier
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
Old 23rd April 2021, 07:53 PM   #101
Bonsai is offline Bonsai  Europe
diyAudio Member
 
Bonsai's Avatar
 
Join Date: Jul 2003
Location: Europe
X-Altra HPA-1 Class A Headphone Amplifier
Javier, I will do the SMD video this weekend.

Good luck with the rest of your build!
__________________
Bonsai X-Altra MC/MM preamp http://hifisonix.com/x-altra-phono-eq-preamp/ Ground Loops http://hifisonix.com/ground-loops/
  Reply With Quote
Old 23rd April 2021, 08:40 PM   #102
passive420 is offline passive420  United Kingdom
diyAudio Member
 
Join Date: Jun 2013
It would be nice to try different op-amps and like the adapter Sparkos labs are offering -

DIP to SOIC Op Amp Adapter - Sparkos Labs, Inc.

However the price is silly so will use these 8 way connectors -

20021121-00008C4LF Amphenol FCI | Mouser United Kingdom
20021321-00008C4LF Amphenol FCI | Mouser United Kingdom

With brown dog PCB's without pins -

SOIC-8 to DIP Adapter - BrownDog Adapters - 970601
  Reply With Quote
Old 26th April 2021, 04:18 PM   #103
sonidos is offline sonidos  United States
Libertador de la Mķsica
diyAudio Member
 
sonidos's Avatar
 
Join Date: Jul 2007
Location: Round Rock, TX
X-Altra HPA-1 Class A Headphone Amplifier
I had company this weekend, but the next steps are to head to the garage and start drilling and filing aluminum. I see I could have done slightly better with psu board layout to make my life easier, but it will all be good.
  Reply With Quote
Old 1st May 2021, 03:19 PM   #104
passive420 is offline passive420  United Kingdom
diyAudio Member
 
Join Date: Jun 2013
Still got one perfectly built X-Altra amplifier available for sale, this is a cracking little amp for £30. Elvee's Dual Denoiser PCB included.
Attached Images
File Type: jpg IMG_2726.jpg (979.8 KB, 106 views)
  Reply With Quote
Old 3rd May 2021, 09:52 AM   #105
ChrisT84 is offline ChrisT84  Netherlands
diyAudio Member
 
Join Date: Apr 2021
I want to add some feature to this amp, like symmetric inputs (through a balanced line receiver). So I plan to build my own board, is this allowed?

First I have to redraw the circuit, then add the additional features. I can provide the resulting schematics and board details, if it's finished.

Maybe someone can have a look, if I made some mistake(s) during redrawing?
Imgur: The magic of the Internet
  Reply With Quote
Old 3rd May 2021, 01:16 PM   #106
Bonsai is offline Bonsai  Europe
diyAudio Member
 
Bonsai's Avatar
 
Join Date: Jul 2003
Location: Europe
X-Altra HPA-1 Class A Headphone Amplifier
The circuit is published in the public domain - you are free to use it.
__________________
Bonsai X-Altra MC/MM preamp http://hifisonix.com/x-altra-phono-eq-preamp/ Ground Loops http://hifisonix.com/ground-loops/
  Reply With Quote
Old 3rd May 2021, 05:53 PM   #107
kn0ppers is online now kn0ppers  Germany
diyAudio Member
 
Join Date: Mar 2019
Quote:
Originally Posted by ChrisT84 View Post
Maybe someone can have a look, if I made some mistake(s) during redrawing?
Imgur: The magic of the Internet
I haven't looked at it in detail, but it seems you are using EasyEDA. You might want to select a different OpAmp with identical pinout and footprint from the parts library, one that comes with the nice schematic symbols we all know for OpAmps (instead of these ugly boxes with 8 pins). You can search for OPA1642, that should give you the correct footprint with nice schematic symbols. The resulting schematic will be more structured and easier to check for mistakes. You can change the name to whatever you want after you placed the symbols.
  Reply to this post

Reply


X-Altra HPA-1 Class A Headphone AmplifierHide this!Advertise here!
Thread Tools

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
Bonsaiís X-Altra MC/MM Phono Preamp al2002 Analogue Source 133 10th May 2021 09:31 AM
HPA-1 Class A Headphone Amplifier Bonsai Headphone Systems 18 12th August 2020 08:28 AM
HPA-nxV300 & HPA-nxV300se what's the difference? pcsl999 Holton Precision Audio 14 3rd September 2013 10:24 PM
X-Altra Mini LM4562 based Pre-Amp Bonsai Chip Amps 4 15th November 2010 04:12 PM
X-Altra Mini One Bonsai Analog Line Level 8 24th October 2010 10:32 PM


New To Site? Need Help?

All times are GMT. The time now is 03:42 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki