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Old 31st May 2015, 09:43 PM   #1
FX200 is offline FX200  Germany
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Smile My mobile Headphone AMP w. OPA134 & BUF634

My first try to build a mobile Headphoneamp.
I used the Datasheet/Shematic from the BURRBROWN BUF634. I only changed a little bit the overall Gain.

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As battery i take 8 pieces of 3,7Volt Lithium with two charging moduls from Keeppower WYY-EBD02-AB - so i get +-14.8V (max. 16,8V min: 10,7V, while charging 17,5V) It plays round about 12-14h

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The PCB i made was to build some headphone amp for home use.
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size compare with my sony xperia:
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case:
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internal wiring (i'am not lucky whit the result, but considering that it was not planned as a mobile amp the result is not bad, i think so )
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This is my first step in the world of "better" Headphoenamps. I'am very impressed how fine it sounds.

Next step - build an charging socket to load the Batteries easy
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Old 2nd June 2015, 02:01 PM   #2
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Looks first class to me, very nice job.
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Old 2nd June 2015, 02:20 PM   #3
mlloyd1 is offline mlloyd1  United States
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is that a custom milled enclosure or did you buy it somewhere?
very nice work!

mlloyd1
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Old 2nd June 2015, 02:35 PM   #4
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Nicely executed, but it's neither meat nor fish.

A battery desktop?

Nice big shiny HEAVY enclosure. Why bother with the batteries?

Or build highly integrated with an enclosure no bigger than a mobile phone and be truly portable. This is where to go with CNC machining or 3D printing.
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Old 2nd June 2015, 04:31 PM   #5
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And shouldn't it be painted red? And flamed? There's no 5-band equalizer, and where's the kitchen sink? No no, this won't do at all.

PS that I-mean-it case really blows me away.
.

Last edited by bentsnake; 2nd June 2015 at 04:33 PM.
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Old 3rd June 2015, 06:56 AM   #6
FX200 is offline FX200  Germany
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Join Date: Nov 2009
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Quote:
Originally Posted by mlloyd1 View Post
is that a custom milled enclosure or did you buy it somewhere?
very nice work!

mlloyd1
custom milled.


Quote:
Originally Posted by bentsnake View Post
Looks first class to me, very nice job.
Thanks




Quote:
Originally Posted by counter culture View Post
Nicely executed, but it's neither meat nor fish.

A battery desktop?

Nice big shiny HEAVY enclosure. Why bother with the batteries?

Or build highly integrated with an enclosure no bigger than a mobile phone and be truly portable. This is where to go with CNC machining or 3D printing.
Why this Batteries? ... why not?
The point is this, in my job it's allowed since a few weeks to use headphones (reduce office noise) BUT it's not allowed to take some power for your private Stuff like charging smartphones or so .... now i can use my DT770 at the job, the Batteries hold up easy 1-3 Days ... easy to put it in my Laptop Bag ... that's the story why this mobile headphone amp ist not the smallest
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Old 9th June 2015, 01:57 AM   #7
T in AZ is offline T in AZ  United States
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I like it!
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