Simple Headphones Amplifier

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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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Chrisv1983 said:
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/showfile.php?file=cmoy2_prj.htm
 
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 :dodgy: ).

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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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.