diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Solid State (http://www.diyaudio.com/forums/solid-state/)
-   -   Simple Headphones Amplifier (http://www.diyaudio.com/forums/solid-state/36467-simple-headphones-amplifier.html)

Chrisv1983 21st June 2004 08:11 PM

Simple Headphones Amplifier
 
2 Attachment(s)
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. :confused:

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

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

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 :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

Elso Kwak 22nd June 2004 10:02 AM

Headwize
 
Just see www.headwize.com
Lot's of schematics for headphone amps!:cool: :idea:


All times are GMT. The time now is 07:38 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2