Simple Headphones Amplifier

Chrisv1983 · 21st June 2004, 08:11 PM

What do you think about this simple headphones amplifier?
It is designed to work with 600 ohms headphones.
Voltage gain is about 80.
How do I determine the right value of the quiescent current in the output stage? Does it depend on the max current flowing in the load?

VCC= 28V
R1 = 22 Kohm
R2 = 3.3 Kohm
Rc = 1.2 Kohm
R''e1 = 10 ohm
R'e1 = 270 ohm
Re2 = 330 ohm
C1 = 10 uF
C2 = 47 uF
Ce = 100 uF
RL = Headphone

Thanks

Algar_emi · 21st June 2004, 11:02 PM

This may be simpler and maybe better:

http://focus.ti.com/docs/prod/folde.../tpa6120a2.html

Timn8ter · 21st June 2004, 11:45 PM

I wasn't able to get to the web page with the truncated link.

Timn8ter · 21st June 2004, 11:48 PM

got it!

It should say print between folders and tpa6120a2

prod/folders/print/tpa6120a2.html

paulb · 22nd June 2004, 03:15 AM

The HSOP package may be a problem to work with, depending on how you plan to build your amp. Note the TI part is basically just an op-amp; if you're running 600 ohm phones an opamp like the OPA2134 will work fine.
Here's a few more headphone amp projects:
http://headwize.com/projects/index.htm

peranders · 22nd June 2004, 07:49 AM

Quote:

Originally posted by Chrisv1983
What do you think about this simple headphones amplifier?
It is designed to work with 600 ohms headphones.
Voltage gain is about 80.
How do I determine the right value of the quiescent current in the output stage? Does it depend on the max current flowing in the load?

VCC= 28V
R1 = 22 Kohm
R2 = 3.3 Kohm
Rc = 1.2 Kohm
R''e1 = 10 ohm
R'e1 = 270 ohm
Re2 = 330 ohm
C1 = 10 uF
C2 = 47 uF
Ce = 100 uF
RL = Headphone

Thanks

If you are going to learn something this may be a good start but if the main purpose is to get louder in your headphones, this is the wrong way.

First you will need gain of 2-5 and you must have some feedback if you want low distortion.

If you want to make it easy for you, why don't you try a CMOY?
http://headwize.com/projects/index.htm
http://headwize.com/projects/showfil...=cmoy2_prj.htm

Devil_H@ck · 22nd June 2004, 09:13 AM

Peranders is right. If that thing's really got 80 voltage gain, you're either going to kill your hearing or your headphones.

Try the Chu Moy, I started with it too. And the parts are so cheap that you can make serveral & experiment with them. I got 5 of them (of which 4 work & 1 hums

).

If you want something extra, try adding a crossover, it's great when you listen for long periods. It keeps the headace (because of the super stereo effect) away.

I made a PCB layout for the Chu Moy + Ohman crossfeed: http://members.lycos.nl/anthonyvh/index.php?page=chumoy

Elso Kwak · 22nd June 2004, 10:02 AM

Just see www.headwize.com
Lot's of schematics for headphone amps!

22nd June 2004, 09:13 AM	#7
Devil_H@ck diyAudio Member Join Date: Dec 2003 Location: Belgium	Peranders is right. If that thing's really got 80 voltage gain, you're either going to kill your hearing or your headphones. Try the Chu Moy, I started with it too. And the parts are so cheap that you can make serveral & experiment with them. I got 5 of them (of which 4 work & 1 hums ). If you want something extra, try adding a crossover, it's great when you listen for long periods. It keeps the headace (because of the super stereo effect) away. I made a PCB layout for the Chu Moy + Ohman crossfeed: http://members.lycos.nl/anthonyvh/index.php?page=chumoy __________________ Website: http://members.lycos.nl/anthonyvh

22nd June 2004, 10:02 AM	#8
Elso Kwak Banned Join Date: Dec 2001 Location: Zamboanga, City of Flowers, Mindanao	Headwize Just see www.headwize.com Lot's of schematics for headphone amps!

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21st June 2004, 11:02 PM	#2
Algar_emi diyAudio Member Join Date: Oct 2002 Location: Canada, Qc	This may be simpler and maybe better: http://focus.ti.com/docs/prod/folde.../tpa6120a2.html

21st June 2004, 11:45 PM	#3
Timn8ter diyAudio Member Join Date: Jul 2003 Location: Seattle, WA	I wasn't able to get to the web page with the truncated link.

21st June 2004, 11:48 PM	#4
Timn8ter diyAudio Member Join Date: Jul 2003 Location: Seattle, WA	got it! It should say print between folders and tpa6120a2 prod/folders/print/tpa6120a2.html

22nd June 2004, 03:15 AM	#5
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	The HSOP package may be a problem to work with, depending on how you plan to build your amp. Note the TI part is basically just an op-amp; if you're running 600 ohm phones an opamp like the OPA2134 will work fine. Here's a few more headphone amp projects: http://headwize.com/projects/index.htm

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