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?
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
This may be simpler and maybe better:
I wasn't able to get to the web page with the truncated link. :confused:
It should say print between folders and tpa6120a2
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:
Re: Simple Headphones Amplifier
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?
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
Just see www.headwize.com
Lot's of schematics for headphone amps!:cool: :idea:
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