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

CS6A4689 Headphone amplifier project
CS6A4689 Headphone amplifier project
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 7th July 2017, 07:23 AM   #11
tedkok is offline tedkok  Hong Kong
diyAudio Member
 
Join Date: Feb 2015
Location: Hong Kong
Soldering SMD parts is not that difficult, it can be easily done with hot air gun or even a toaster

https://www.youtube.com/watch?v=2Z7nCAxS2Rg

https://www.youtube.com/watch?v=SN8fzpigTGM

The sample that we've built in house and has the photos posted in this thread are soldered with chipquik

http://www.mouser.hk/ProductDetail/C...8SKpiVtS3TQhIh

and an old toaster oven, just like that posted in youtube.

Of course, if you are interested to get a pcb with everything soldered on it,
do please let me know where I shall courier it to, and I shall quote to you.

Actually if you want all the components, and bare PCB, you can also contact me, and I shall quote to you about that too.

  Reply With Quote
Old 7th July 2017, 06:40 PM   #12
ammel68 is offline ammel68  United States
diyAudio Member
 
Join Date: Sep 2009
Location: Southeast, U.S.
CS6A4689 Headphone amplifier project
Tedkok, what is the gain of your circuit and can it be adjusted down to 6dB or so?
  Reply With Quote
Old 8th July 2017, 12:10 AM   #13
tedkok is offline tedkok  Hong Kong
diyAudio Member
 
Join Date: Feb 2015
Location: Hong Kong
Hi Ammel68,

The gain of the amplifier is controlled by the negative feedback resistor pairs. The posted circuit has a 3 way switch connected to it, and hence makes it adjustable. The posted circuit has the gain to be adjustable between

1.3x 4x 9x

If you want 6dB, all you need to do is to change the feedback resistor values, and that will do.

  Reply With Quote
Old 8th July 2017, 08:18 AM   #14
tedkok is offline tedkok  Hong Kong
diyAudio Member
 
Join Date: Feb 2015
Location: Hong Kong
some more details on the start up pop sound removal circuit, which also
give enough time for the DC-DC converter to settle. With refer to the attached figure, the key is to allow enough time between circuit being powered up (the blue signal), and the relay being released (it's an normal short relay). Adjusting the RC timing according to that label in the schematic will help to achieve the desired power up delay (and hence pop sound removal), and the wait time that you find flustrated.

Attached Images
File Type: png timing.png (83.5 KB, 136 views)
  Reply With Quote
Old 9th July 2017, 05:26 AM   #15
thuanth43 is offline thuanth43  Viet Nam
diyAudio Member
 
Join Date: Apr 2016
Location: Saigon
Any idea regarding the cost of the CS6A4689 chip? Soldering SMD is easy for me, would love to try another headphone amp design.
  Reply With Quote
Old 9th July 2017, 06:31 AM   #16
ammel68 is offline ammel68  United States
diyAudio Member
 
Join Date: Sep 2009
Location: Southeast, U.S.
CS6A4689 Headphone amplifier project
Quote:
Originally Posted by tedkok View Post
Hi Ammel68,

The posted circuit has the gain to be adjustable between

1.3x 4x 9x

If you want 6dB, all you need to do is to change the feedback resistor values, and that will do.
1.3x or 4x gain will work for me. How much for an assembled board to the U.S.?
Thanks.
  Reply With Quote
Old 16th July 2017, 04:46 PM   #17
tedkok is offline tedkok  Hong Kong
diyAudio Member
 
Join Date: Feb 2015
Location: Hong Kong
Changed to a round corner case, and 3D printed the front and back cover

Now the amplifier is running perfectly. The next step will be making a AL CNC front and back cover
Attached Images
File Type: jpg front.jpg (69.2 KB, 106 views)
File Type: png back.png (455.7 KB, 104 views)
File Type: png side.png (288.2 KB, 99 views)
File Type: png side2.png (143.9 KB, 94 views)
  Reply With Quote
Old 16th July 2017, 04:49 PM   #18
tedkok is offline tedkok  Hong Kong
diyAudio Member
 
Join Date: Feb 2015
Location: Hong Kong
Thanks for your messages thuanth43, and ammel68.

Actually, I was wondering if I put this amplifier to Kickstart, will
you guys be my honored supporters? If that's the case, what price range will you be willing to pay for it? say, assembled PCB, and assembled PCB with CNC AL case. What about customerization, say using better quality input DC blocking capacitors, etc....

Thanks in advance for your inputs....

Cheers
  Reply With Quote
Old 18th July 2017, 08:37 AM   #19
wfkwong is offline wfkwong  Hong Kong
diyAudio Member
 
Join Date: Oct 2008
I am alsom come from hk. I am very interested in this project too. ^__^
  Reply With Quote
Old 18th July 2017, 04:54 PM   #20
tedkok is offline tedkok  Hong Kong
diyAudio Member
 
Join Date: Feb 2015
Location: Hong Kong
WFKwong, if we put this into Kickstart, will you be interested to get one. If that's the case....how much should I post it on kickstart....any suggestions?
  Reply With Quote

Reply


CS6A4689 Headphone amplifier projectHide 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
headphone amplifier ioannidis Headphone Systems 0 22nd February 2016 07:18 AM
Headphone Impedance and headphone amplifier TheGimp Tubes / Valves 89 3rd May 2014 02:46 PM
Looking for a Headphone Amplifier weemo Headphone Systems 14 20th September 2013 09:29 PM
Headphone amplifier audiofan Headphone Systems 5 3rd March 2006 04:43 PM
headphone amplifier?? sunrise Headphone Systems 0 20th August 2005 12:17 PM


New To Site? Need Help?

All times are GMT. The time now is 04:27 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki