Simple Headphone Amp - Page 2

Nico Ras · 4th November 2007, 08:45 AM

Howzit Nordic, I know the feeling, as long as it is bags of money you refer to. I have just completed wiring in a back-up power system to all the things that I need in case of power failures..

We are getting ready for what you had and probably still have in CT. At least here we get a time table with power outages per area

Turned the system on and wow, no smoke, sparks or anything in the house going live.

Nordic · 4th November 2007, 11:52 AM

post 5... both main rails V+?
Suitable output transistors?
PSU voltage?

jacco vermeulen · 4th November 2007, 11:59 AM

typo, the bottom rail should be -
Unique idea, even with BC types it's a simple and cheap 3-stager.

Nico Ras · 4th November 2007, 03:02 PM

Thanks Jacco, you are right.

Gordy · 4th November 2007, 04:30 PM

Quote:

Originally posted by Nico Ras

Gordy, the first improvement to the is amp is using a CCS, I used a LM317 in my current version.

One can also use the classic resistor zener CCS but I find this adds much hiss and is very anoying at low volumes, so I suggest either a mosfet or LM317.

I like the simplicity of the 317, and it fits into the sentiment of the project too.

You may already have the following info on Constant Current Sources... well worth a read...

http://www.audioxpress.com/magsdirx/...a/jung2778.pdf
and
http://www.audioxpress.com/magsdirx/...a/jung2779.pdf

Nico Ras · 4th November 2007, 07:56 PM

This is the complete circuit with LM317 CCS and power supply added. I will update the PCB layout and post it when done.

Nico Ras · 6th November 2007, 08:36 PM

Quote:

Originally posted by Gordy
[B]

I like the simplicity of the 317, and it fits into the sentiment of the project too.

You may already have the following info on Constant Current Sources... well worth a read...

Hi Gordy,

I have made several measurements and it appears as if the distortion with a resistive load is an order of magenetude lower than using any typical CCS.

Unless someone can advise otherwise I suggest that the circuit should remain as in 1.

The measurements where taken at 4V p-p into a 50 Ohm resitive load.

Gordy · 6th November 2007, 09:21 PM

Curious, and interesting.

I'll be knocking up a headphone amp as a winter project so will give your circuit a try in a few weeks.

Nico Ras · 7th November 2007, 05:01 PM

Attached is a pic of the finished SE prototype.

Nico Ras · 7th November 2007, 05:14 PM

PCB of the stereo SE head phone amp. Measures 95 x 40 mm.

4th November 2007, 11:59 AM	#13
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	typo, the bottom rail should be - Unique idea, even with BC types it's a simple and cheap 3-stager. __________________ Not so much,.......if it says "ZM" in the corner.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Simple Headphone Distribution Amplifier	TheSeekerr	Headphone Systems	7	28th November 2010 11:08 AM
TSHA.. A very simple Headphone Amp idea..	Dxvideo	Headphone Systems	15	1st February 2009 07:04 PM
Discrete simple headphone amp	kubeek	Headphone Systems	15	7th September 2007 04:13 PM
A simple Headphone amplifier.	Kapibara	Headphone Systems	3	20th July 2007 08:55 AM
Capacitor type for simple headphone amp	GianLorenzo	Headphone Systems	3	20th December 2004 08:45 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

4th November 2007, 08:45 AM	#11
Nico Ras diyAudio Member Join Date: Nov 2005 Location: Amanzimtoti - East Coast of South Africa	Howzit Nordic, I know the feeling, as long as it is bags of money you refer to. I have just completed wiring in a back-up power system to all the things that I need in case of power failures.. We are getting ready for what you had and probably still have in CT. At least here we get a time table with power outages per area Turned the system on and wow, no smoke, sparks or anything in the house going live.

4th November 2007, 11:52 AM	#12
Nordic diyAudio Member Join Date: Sep 2005	post 5... both main rails V+? Suitable output transistors? PSU voltage?

4th November 2007, 03:02 PM	#14
Nico Ras diyAudio Member Join Date: Nov 2005 Location: Amanzimtoti - East Coast of South Africa	Thanks Jacco, you are right.

6th November 2007, 09:21 PM	#18
Gordy diyAudio Member Join Date: Nov 2006	Curious, and interesting. I'll be knocking up a headphone amp as a winter project so will give your circuit a try in a few weeks.