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Old 25th November 2013, 12:31 AM   #1
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Default My new headphone amp

Hi. Here on of my newest project. It is a fully dual mono all discrete FET headphone amplifier in Class-A. Real Class-A at 100ma per supply, and channel. With supplies of +/-24V it is 9.6W in Class-A (200ma * 48V = 9.6W). It is cooking

It sounds superb, perfectly silent with dual fully discrete low noise regulators with CRC pre-filters. The case was made by Front Panel Express, side wood panels in exotic Padouk wood with oil finish.

The circuit is DC coupled, we no coupling capacitor in the signal path. A servo takes care of the small circuit thermal drift.

Here the prototype pictures
Attached Images
File Type: jpg All Fets Line Amp & Headphone_small.JPG (154.7 KB, 578 views)
File Type: jpg All Fets Regs_small.jpg (154.0 KB, 561 views)

Last edited by Algar_emi; 25th November 2013 at 01:00 AM.
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Old 25th November 2013, 12:33 AM   #2
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And the completed amp. It is using great parts everywhere Furutech AC power inlet, Non-magnetic line noise filter (aka Ayre es filter), Low noise vibration decoupled dual toroid transformers, Philips/Vishay huge pre-filter caps, Wima, Nichicon KG/Muse, CDE and Vishay caps, Caddock MK132 and Vishay CMF55 film resistors, Noble volume pot, Canare power & Mogami audio cables, 6N single crystal copper hookup wires, Cardas and Amphenol connectors and the classic blue led power on indicator.

Even the bottom is nice, with vibration decoupling feet, laser trim ventilation holes and concealed power-on switch.
Attached Images
File Type: jpg Inside_Top.JPG (58.8 KB, 547 views)
File Type: jpg Top.JPG (78.7 KB, 529 views)
File Type: jpg Bottom.JPG (33.2 KB, 496 views)

Last edited by Algar_emi; 25th November 2013 at 12:55 AM.
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Old 25th November 2013, 12:40 AM   #3
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The power section is all assembled point-to-point. I did my own PCB. Ventilation holes can be seen on the back. You cannot see it but there is bitumen vibration absorbing pad under the top cover. Front and Back views. It is real statement amp, top of its class. Difficult to do better I guest...
Attached Images
File Type: jpg Front_small.JPG (33.8 KB, 196 views)
File Type: jpg Back_small.JPG (34.9 KB, 186 views)

Last edited by Algar_emi; 25th November 2013 at 12:58 AM.
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Old 25th November 2013, 08:37 AM   #4
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Any schematics?
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Old 25th November 2013, 10:12 AM   #5
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Why do you run a headphone amplifier from +/-24V rails? I would think it is wasted energy dissipating 9.6 watt if 200 mW/ch would certainly damage most headphones/ears.
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Old 25th November 2013, 11:11 AM   #6
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Sorry no schematic. This is a design is copyright and I cannot disclose any details. This circuit can also be used as a preamp, single-ended or balanced. Indeed the supply can be lowered to +/-18V, but the regulator will then dissipate more heat. Input of the regulators are +/-31V. I may try that to lower the amp dissipation. It is a balance between amps and regs.
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Old 25th November 2013, 01:09 PM   #7
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Quote:
Originally Posted by Algar_emi View Post
Sorry no schematic. This is a design is copyright and I cannot disclose any details. ...
Why post it on a _diy_ site then ?
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Old 25th November 2013, 02:09 PM   #8
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Why post it on a _diy_ site then ?
Admiration only
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Old 25th November 2013, 03:59 PM   #9
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Originally Posted by gk7 View Post
Why post it on a _diy_ site then ?
Free Advertising?
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Old 25th November 2013, 04:12 PM   #10
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Judging by a small visible part of PSU schematic, it's one of Erno Borbely design: all-fet Super-shunt regulator as well as all-fet Preamp.
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