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Old 25th April 2005, 04:09 AM   #1
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Default My Headphone Amplifiers

Hi,

Here are some pictures of yesterday's project, a headphone amp I designed around the popular OPA627 and BUF634 from BB.

Note I could not find my box of metal films so the carbon films I had lying around had to do. Yes, I know for audiophile devices they are not prefered but I can't really tell much of a difference audibly anyway.

Sounds really good, good rail filtering and lack of ground loops = no audible noise at all even though I am not using regulated supplies.

All caps are misc Panasonic FC electrolytics and 0.1uF 1206 SMT for decoupling. The OPA are in sockets so I can swap between OPA134 and OPA627 to see the difference in sound quality.

Rails are +/- 15V.



-Matt
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Old 25th April 2005, 04:10 AM   #2
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The bottom...
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Old 25th April 2005, 04:16 AM   #3
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Here are my two headphone amps sitting by each other.

The one in the black case is a similar unit based on 4 x OPA627 that runs off two 9V batteries for +/- 9V. It is small and self-contained so as to take along with my portable CD player, note the headphone jack input on it.

I would say that they both sound about the same, I can't give an honest comparison through because I have not run the black unit from my reference CD player, just the portable. The opposite is true of the mains-powered unit, I have never run that one with the portable. If I got some adapters from headphone jack - RCA and visa-versa I could easily do a comparison between the two.







-Matt
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Old 25th April 2005, 07:05 PM   #4
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Hi!!
looks great!!
have you schematic & pcb design???
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Old 25th April 2005, 11:01 PM   #5
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I did not draw a schematic for it but here is the PCB.

I have it in native format (P-CAD 2002 .pcb file) if you can view that and if there is any interest I can generate gerbers.









-Matt
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Old 26th April 2005, 03:22 AM   #6
speaker is offline speaker  United States
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Quote:
Originally posted by zagisrule!
Here are my two headphone amps sitting by each other.
Nice floor!

speaker
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Old 26th April 2005, 06:59 AM   #7
digi01 is offline digi01  China
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nice!have you try to power on the amp by regulated power supply?


Z
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