Promotion: Hi-end Volume Control Module,Ultimate Attenuator for Audio - diyAudio
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Old 4th July 2010, 07:42 AM   #1
bbp is offline bbp  China
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Join Date: Sep 2005
Default Promotion: Hi-end Volume Control Module,Ultimate Attenuator for Audio

With years of audio attenuators design & development experience, Ortho Audio presents new attenuator with remote for DIY HI-END project------Ultimate Attenuator for Audio.

The UAA based on true R-2R topology, which provides best audio performance and precision of attenuation. Such topology can be found in high performance high-frequency PGA chips like X-AMPs by ADI (analog device Inc).

Controlling volume is one of the most important part in HIFI/HIEND systems. The best way is to use digital controlled attenuation modules, this method provides higher controlling precision, higher audio performance and more convenience. One example is Mark Levinson No.32 reference preamplifier, there are two precision R-2R attenuation modules in it. The UAA is nearly a ‘clone’ of Mark Levinson’s module, the topology, device, layout and structure of UAA are similar with Mark Levinson’s.

The design and test of UAA cost more than one year, carefully 4 layers layout provides high audio performance. The final version UAA module provides super THD+N performance <0.0003% with 5V balanced driving 750 ohm load, residual noise less than 1.5uV with 20~22K BW. All the measurement were given by ATS-2 (Audio Precision Inc).

The UAA was designed as mono balanced structure, which provides best performance for balanced audio system. One UAA module can be also configured as dual single-end channels, in this case, UAA can be used in common stereo systems.

Easy to use. UAA needs only extra +/-14V DC regulated PSU and one digital controller. There are four IO ports in UAA. PSU, CONTROL , INPUT and OUTPUT. All the IO ports are standard 2.54mm headers. MCU , remote handset and display module comes with UAA module.

For more information, please refer to another thread in diyaudio of mine

FS:ultimate attenuator kit for audio,balanced/single-end


promotion: 350 USD balanced version, only 1 kit available ^_^

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Old 4th July 2010, 09:55 AM   #2
johnYks is offline johnYks  Australia
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Hello BPP- I've sent you an email concerning the module.
_
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Old 6th July 2010, 06:26 AM   #3
bbp is offline bbp  China
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Default Uaa

Quote:
Originally Posted by johnYks View Post
Hello BPP- I've sent you an email concerning the module.
_
Hi John, please check your email
thank you



regards
Paul Lu
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Old 7th July 2010, 09:32 PM   #4
bbp is offline bbp  China
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Hi texas, you've got email
thank you
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Old 13th July 2010, 01:26 PM   #5
bbp is offline bbp  China
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Hi John, your kit is on the way ^_^

one more promotion balanced kit is ready, any interest ?
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Old 13th July 2010, 02:31 PM   #6
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Location: colorado
Just wondering.
You're only offering balanced single channel?
Are you planning on offering more and would they be suitable for stacking
several unit for full surround system? (I guess that depends on the controller)
What type of controller interface bus?
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Old 14th July 2010, 07:52 AM   #7
bbp is offline bbp  China
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Quote:
Originally Posted by coloradosound View Post
Just wondering.
You're only offering balanced single channel?
Are you planning on offering more and would they be suitable for stacking
several unit for full surround system? (I guess that depends on the controller)
What type of controller interface bus?
Hi coloradosound,

Yes the interface bus of controller determined how many R-2R modules can be control individually. Now only stereo balanced available, but multi-channel is optional in the futrue
thank you for your advice


best regards
Lu
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Old 19th July 2010, 09:13 AM   #8
prakit is offline prakit  Thailand
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Join Date: Jan 2005
Location: Bangkok, Thailand
Hi Lu,
Is it easy to separate the input selector and the attenuator? I suppose the output from the input sector is fed to the attenuator. I want to use it to attenuate the output from the linestage pre so the selector can be used to choose the source input.
Best
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Old 19th July 2010, 12:08 PM   #9
bbp is offline bbp  China
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Quote:
Originally Posted by prakit View Post
Hi Lu,
Is it easy to separate the input selector and the attenuator? I suppose the output from the input sector is fed to the attenuator. I want to use it to attenuate the output from the linestage pre so the selector can be used to choose the source input.
Best

Hi Prakit, It is easy to separate the input selector and the attenuator, just cut the copper trace in the bottom side.

sele-out=selector output
At-in=R-2R attenuator board input
Click the image to open in full size.

please check the jpg file
thank you


best regards
Lu
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Old 29th July 2010, 04:15 AM   #10
prakit is offline prakit  Thailand
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Hi Lu,
Sent u a pm.
BR
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