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Old 26th July 2013, 09:08 PM   #21
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Try this circuit. It's my own!

I designed it for 150 ohm Sennheiser HD600s. It's class A, current feedback, fairly simple and all discrete (you can use a wallwart) and has great performance with plenty of headroom for those high impedance cans. In your case you could probably get away with increasing R12 to 15R and saving some heatsink size and power!

Good luck, whatever you choose!
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Old 28th July 2013, 03:46 PM   #22
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opps delete
Perboards are fun
XMOS->PCM1794->LME49720->BUF634(x2)->KRK KNS08400
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Old 2nd September 2013, 02:10 PM   #23
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Oh come on guys! 10 milliwatts is a lot of power for headphones. How about a 100 milliwatt driver. It would be

E^2 = R*P


E = (R*P)^.5

That's 7.7 Volts (RMS blah,blah,blah)

A permanent alternative would be to use an audio transformer say 1000 ohms to 16 ohms. Connect the 16 ohm side to the amp and the 1000 ohm to the headphones.

FYI - The $5.00 headphones sound almost as good as the old Sennheiser (I'll wash my mouth later) and the Philips $20 headphones are quite a bit better.

Opinions - I've got one too, or should that be 1:2
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Old 2nd September 2013, 06:18 PM   #24
Vladco is offline Vladco  United States
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Another option not really DIY but may sute you better
Class A 12 and 6 Series GE5814 12AU7 6N11 Tube Valve Headphone Amplifier Amp | eBay Search headfi for more revews. And get better tube with total under $70.
Or build a simple cmoy. Several guides are on the web. Or ra1 clone for a few bucks. O2 is another option.
When you get a better source you should think about spending more money. Not now.
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Old 2nd September 2013, 07:40 PM   #25
davym is offline davym  Europe
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If you have a clean 12vdc supply, you could try one of Freds Amps 12AU7 C moy headphone amp's. Check them out on ebay, astonishingly cheap for the sound quality.
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Old 17th September 2013, 02:33 AM   #26
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Topping D2 Headphone AMP.
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Old 17th September 2013, 04:22 PM   #27
RNMarsh is offline RNMarsh  United States
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I might as well offer up mine, too--- see the Marsh Headphone amp... try it out.

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Old 17th September 2013, 04:58 PM   #28
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A simple transformer will do the job without any power source. Try a 220/24 V reverse wired (Use low voltage as the primary). No need for hifh power. It will give 220/24 aprox 10:1 in voltage gain, and 100:1 in impedance, matching 600R into 6R.
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
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