Open Source Headphone Amplifier - diyAudio
Go Back   Home > Forums > Amplifiers > Headphone Systems

Headphone Systems Everything to do with Headphones

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 13th June 2013, 11:03 AM   #1
diyAudio Member
 
Join Date: Jun 2013
Location: China
Default Open Source Headphone Amplifier

Hi, I'm trying to build an amplifier for my Bladelius USB DAC and my ER4S. As ER4 series share the same actuator, differs in only cables, and the cable is interchangeable, I decided to make a BALANCED amplifier for my ER4. To make the amplifier more universal, I want to make a balanced or unbalanced input, balanced or unbalanced output amplifier, with over 120dB SNR and -120dB THD. While being HiFi, it should consume low power and be small form factor, to be fitted inside any currently available portable devices.
The circuit chosen is diamond buffer plus op-amp, the buffer is designed as the buffer used inside LME49600, and the OP is OPA1602. The attachment is the schematic of one channel. If anyone have any ideas, feel free to let me know.
Signal feeds from INN and INP, outputs from OLN and OLP. Power supplies are P- and P+.


License:
1. Redistribution of this circuitry or its related products must reproduce this license term, and declare that it is originally designed by GAO Bo, aka Blueskull, and this should not be used as any sort of advertisement.
2. This design is provided without any express or implied warranty. Licensees shall be responsible for any negative consequence included but not limited to personal injury, patent issue or property loss.
Attached Images
File Type: png hpa.png (46.9 KB, 344 views)
  Reply With Quote
Old 13th June 2013, 08:41 PM   #2
diyAudio Member
 
Join Date: Jun 2013
Location: China
Default Update 2013/JUN/14 4:38 GMT+8

Added power converter.
Added 2 MCUs.
Added Board-2-Board I/O connector.
Added mid point protection circuit.

This should be a complete system.

Attachments: All snapshots in PNG, exported project in PDF.
Attached Images
File Type: png HPA.png (89.3 KB, 303 views)
File Type: png IOC.png (26.5 KB, 260 views)
File Type: png MCU.png (27.1 KB, 245 views)
File Type: png PWR.png (106.8 KB, 254 views)
Attached Files
File Type: pdf HPA.pdf (502.7 KB, 11 views)
  Reply With Quote
Old 15th June 2013, 08:34 PM   #3
diyAudio Member
 
Join Date: Jun 2013
Location: China
Default Third Version

Third Version:
Bug fixes: Re-annotated some nets.
Bug fixes: Changed source voltage sampling circuit to save idle power.
Added: PCB library.
Added: Parameter annotation.
Added: Footprint specified.
Added: Extra input common mode filters.

Schematic drawn in Altium Designer 6.9.
Attached Files
File Type: zip OS_HPA.zip (324.3 KB, 18 views)
  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
Ultimate Open Source XMOS USB-I2S: The source to end all sources. krfkeith Digital Source 4 14th June 2013 03:54 PM
Volume / Source selector - open source project ? AuroraB Analog Line Level 22 22nd September 2012 02:21 PM
Headphone Amplifier power source bman22 Construction Tips 5 28th March 2011 08:30 PM
Open call for suggestions on Open Source DIY Audio Design gfergy Everything Else 1 15th April 2007 07:33 AM
use closed headphone open with current source amp? el`Ol Headphone Systems 1 21st November 2006 02:16 AM


New To Site? Need Help?

All times are GMT. The time now is 03:23 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