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Old 21st June 2004, 09:11 PM   #1
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Default Simple Headphones Amplifier

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
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Old 22nd June 2004, 12:02 AM   #2
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This may be simpler and maybe better:

http://focus.ti.com/docs/prod/folde.../tpa6120a2.html
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Old 22nd June 2004, 12:45 AM   #3
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I wasn't able to get to the web page with the truncated link.
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Old 22nd June 2004, 12:48 AM   #4
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got it!

It should say print between folders and tpa6120a2

prod/folders/print/tpa6120a2.html
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Old 22nd June 2004, 04:15 AM   #5
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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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Old 22nd June 2004, 08:49 AM   #6
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Default Re: Simple Headphones Amplifier

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
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Old 22nd June 2004, 10:13 AM   #7
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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
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Old 22nd June 2004, 11:02 AM   #8
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Lightbulb Headwize

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