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Old 26th May 2002, 11:18 PM   #1
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Default Elliot's DOZ for headphones

Well, i want to incorporate a headphone amp inside my preamp, and spent a while looking for some posibilities. The first one i considered was the THS6012 based one (a high speed opamp designed for ADSL, *impressive* specs!), but it's just too irksome to implement, being a SMD chip.

So, now i'm focusing on this design. Looks quite simple, and reminiscent of the JLH series (perhaps that's why i like it), and if it sounds half as good as the JLH, i'm set. Has anyone tried this design? Comments? Feedback? All appreciated!
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Old 27th May 2002, 05:20 AM   #2
paulb is offline paulb  Canada
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I was going to, but am building the power amp instead. It should be as good or better than Class-A FET headphone amps. Nice simple design. Good quality PCBs. Parts readily available / easily substitutable.
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Old 27th May 2002, 11:51 AM   #3
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Default Re: Elliot's DOZ for headphones

Quote:
Originally posted by Lisandro_P
Well, i want to incorporate a headphone amp inside my preamp. Comments? Feedback? All appreciated!
Hi!

Have you checked with the headphone guys at http://www.headwize.com?
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Old 27th May 2002, 03:57 PM   #4
paulb is offline paulb  Canada
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Forgot to mention: I have a +/- power supply, so I'm building one channel of the DoZ to run off a negative supply. Using complementary transistors, reversing caps, etc. This was the way I was going to build it up for a headphone amp, running off a +/- 25V supply.
If you're building this into a preamp, you might also consider just an op-amp like the OPA2134 (you can parallel them for more output current), or a boosted version using something like the BUF634. Ideas abound at the headwize site. Your choice may depend on how much power supply you have, and what headphones you are driving.
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Old 27th May 2002, 04:14 PM   #5
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Look at my diamond-buffer application .. it's perfectly suitable for low impedance headphones..

see thread "... buffer help.." ..

I am gonna build this thing soon ...

succes,
Thijs
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Old 29th May 2002, 04:22 AM   #6
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Default Lisandro

Headwise is a great site, but somehow i don't like most of their designs a lott... they're very good, don't get me wrong, but somehow they don't ring my bell i preffer BJT's instead of MOSFETs for low power and such...
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Old 29th May 2002, 04:40 AM   #7
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You should keep in mind the that most (if not all) headphones use a common ground (tip ring sleeve) between channels. A balanced output probably will not work.

Aud_Mot
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Old 29th May 2002, 05:18 AM   #8
paulb is offline paulb  Canada
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Quote:
Originally posted by Aud_Mot
You should keep in mind the that most (if not all) headphones use a common ground (tip ring sleeve) between channels. A balanced output probably will not work.

Aud_Mot
Unless (with some headphones) you cut up the cable...something tschrama and I were discussing several months ago.
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Old 1st June 2002, 01:05 AM   #9
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Remember:

Mods to your headphones will stop you from trying your buddy's bitchen' new headphones on your amp.

Plus... It will void the manufacture's warrenty. HA! (insert sly grin here)
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Old 1st June 2002, 08:49 AM   #10
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paulb,

I'm no expert but "building one channel of the DoZ to run off a negative supply" seems more complicated than just paralleling up the output to give +25v with twice the current.

I'm building a DoZ as well but haven't thought much about the PS yet. I was planning to run it from my existing +25 0 -25 volt PS, bugger.

Greg
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