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Old 15th June 2007, 04:40 PM   #121
a1095us is offline a1095us  United States
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Default Re-Cycled Dynaco Chassis - Headphone Amp.

Here is an old Dynaco PAT-4 preamp. chassis that was gutted and the electronics for a headphone amp. were installed. Since I recently purchased a pair of Sennheiser HD-580 headphones, I decided I needed a good dedicated amp to drive them. The amp is the AMB Beta 18, which is basically the the most recent Ti Kan upgrade from the SDS Labs amp..

http://www.ibiblio.org/tkan/audio/beta18.html

BB opa2134 running in class A mode driving a Mosfet pair. LM317-337 power supply. This unit will drive any headphone load loud and cleanly!
Everything was hard wired to perf boards.

Click the image to open in full size.

All The Pics:
http://s76.photobucket.com/albums/j7...adphone%20Amp/
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Old 19th June 2007, 06:48 PM   #122
alex mm is offline alex mm  Europe
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Default Zen Audio Headphone Amplifier

Hello , my new Zen headphone amplifier project by Marcello Pellerano Click the image to open in full size. http://i10.tinypic.com/4zayekj.jpg and http://i9.tinypic.com/673stgh.jpg from www.headwize.com
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Old 1st July 2007, 03:12 AM   #123
Ferrari is offline Ferrari  Netherlands
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Default My â22 headphone amp and ó22 PSU

My Beta22 headphone amplifier is built as 3-channel active-ground configuration and is housed in an ATI-737U enclosure.
The Beta22 boards are mounted on a backplane board to reduce wirings and keep the internal of the amp tidy.
All electrolytic capacitors used on the amplifier boards are Black Gate Std. and the small values capacitors are MKT, MKP and polystyrene. All BJTís are matched within 5% .
Manganin 1% power resistors (type PBH) are used at the output while Vishay-Dale RN55D resistors are used on the remaining part of the amp.
The volume control is an Alps RK40 "black beauty".

Click the image to open in full size.

More pics here:

http://i72.photobucket.com/albums/i1...lding244-1.jpg
http://i72.photobucket.com/albums/i1...a/RIMG0110.jpg
http://i72.photobucket.com/albums/i1...eelding219.jpg
http://i72.photobucket.com/albums/i1...eelding215.jpg

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Old 1st July 2007, 04:02 PM   #124
fab is offline fab  Canada
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Default Re: My â22 headphone amp and ó22 PSU

Quote:
Originally posted by Ferrari
My Beta22 headphone amplifier is built as 3-channel active-ground configuration ....
Hi Ferrari

Fanstastic construction!!!

What is a "3-channel active-ground configuration"?
(Headphone is stereo...at least for humans...)
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Old 1st July 2007, 05:42 PM   #125
Ferrari is offline Ferrari  Netherlands
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Correct, headphone is indeed stereo.
Conventional 2-channel "passive ground" amplifier differs from 3-channel "active ground" amplifier in the way how the return current from the transducers (from speakers in the headphone) is handled. A conventional 2-channel "passive ground" amplifier just dumped the return current from the transducers into signal ground or power supply ground.
In a 3-channel "active ground" amplifier, the "ground" wire of the headphone is driven by a third channel of the same topology as the left and right channels.

The designer (Ti Kan) of the Beta22 described it as follows:

A 3-channel "active ground" amplifier is the recommended configuration for standard 3-wire headphones. The ground channel amplifier sources or sinks the return current from the transducers, which would otherwise have been dumped into signal ground or power supply ground in a 2-channel amp. This shifts responsibility for the high current reactive load of the headphones from signal ground to the tightly regulated power supply rails, thus removing the primary source of signal ground contamination. The headphone transducer "sees" symmetrical output buffers with equal impedance and transfer characteristics on both sides, rather than an amplifier on one side and a capacitor bank of the power supply ground on the other. This results in lower output impedance, greater linearity and reduced stereo crosstalk.
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Old 1st July 2007, 07:03 PM   #126
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Default Hi to All !

After all, it is time for me.
The pictures are not high quality but look at all.
The amp is all made by my self. Mehanic, PCB, Wiring, etc. Thi is a clone of Krell with input stage(voltage amlifier)is old known LEACH.

Regards zeoN_Rider
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Old 1st July 2007, 07:05 PM   #127
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Default CONT.

Front!
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Old 1st July 2007, 07:07 PM   #128
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Default CONT.

Heatsink.
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Old 1st July 2007, 07:08 PM   #129
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Default CONT.

IN.
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Old 1st July 2007, 07:10 PM   #130
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Default CONT.

BACK
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