FS:ultimate attenuator kit for audio,balanced/single-end - diyAudio
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Old 19th March 2010, 11:10 AM   #1
bbp is offline bbp  China
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Join Date: Sep 2005
Default FS:ultimate attenuator kit for audio,balanced/single-end

This is a great KIT for those DIYers who want to build high-end quality audio DIY projects. It based on the following highlights:

R-2R current switching technology
High precision SMD resistors
High performance Analog switches DG413DY
Ultra-high performance Op-Amp AD797AR
Ultra-pure voltage regulator on board
Ultra-low noise
Ultra-low distortion
Low output impedance


Micro-controller with remote handset
4 input sources selectable

Wide range attenuation -96dB~0dB in 1dB/step

With this KIT, you can build a HI-END preamplifier easily ^_^

Price :
$250 single-end stereo
$450 balanced stereo
paypal accepted
airmail registered included

More information about my KITs ^_^
New project : R-2R Attenuator With Remote Control V2

NEW Remote Volume Controller- 10 SETs

For Share: Remote Volume Control KIT

Click the image to open in full size.

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USER MANUAL is ready, drop me an email ^_^
bbp6604560 at hotmail.com
orthoaudio at hotmail.com

thanks
Attached Images
File Type: jpg VOL ULTIMATE.jpg (112.1 KB, 2797 views)
File Type: jpg VOL UL.jpg (98.2 KB, 2752 views)
File Type: jpg VOL U.jpg (114.4 KB, 1553 views)
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Old 19th March 2010, 11:17 AM   #2
bbp is offline bbp  China
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information added

THD+N VS OUTPUT AMPLITUDE
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FFT @-20dBV
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Frequency Response
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Old 19th March 2010, 11:54 PM   #3
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Is one of the inputs a bypass input(signal in will be uneffected by volume control) so It can be used as a home theater-bypass??
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Old 20th March 2010, 12:33 AM   #4
bbp is offline bbp  China
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Quote:
Originally Posted by CustomHT View Post
Is one of the inputs a bypass input(signal in will be uneffected by volume control) so It can be used as a home theater-bypass??

sorry CustomHT, I reserved no bypass input,because the volume control is excellent enough for any audio applications ^_^

the input voltage range up to 10Vrms when you set the attenuation to 0dB,the module still provides low distortion signal
and even it accept 20Vrms input signal when you set the attenuation to -20dB
I most applications,the module can be deemed to a straight line when you set the volume attenuation to 0 dB

maybe a pass through is the best, but maybe w/o a pass through is no the matter ^_^

thank you
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Old 21st March 2010, 03:07 AM   #5
bbp is offline bbp  China
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w/o any capacitor in the audio signal

assembled kit
needs only addtional DC PSU +14/-14 @ 0.2A

easy to setup
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Old 9th April 2010, 09:51 AM   #6
bbp is offline bbp  China
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Only balanced version available now
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Old 9th April 2010, 07:37 PM   #7
jtktam is offline jtktam  Canada
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would a chassis be available for this?

-joe
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Old 10th April 2010, 01:07 AM   #8
bbp is offline bbp  China
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Quote:
Originally Posted by jtktam View Post
would a chassis be available for this?

-joe

Hi Joe,

Maybe later the chassis is available, but I think to ship a aluminium chassis from HK to wordwide cost may a lot >_<

regards
Lu
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Old 17th April 2010, 01:42 AM   #9
bbp is offline bbp  China
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Default New remote handset

aluminium remote handset updated

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Old 22nd April 2010, 09:06 AM   #10
bbp is offline bbp  China
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Default test performance added

Test result added

fully THD+N VS AMPLITUDE test
750 ohm loaded @ each phase of balanced
A-weighting
1mV to 16Vrms sweep

the blue line is the Residual performance
the green line shows the performance of this KIT
Click the image to open in full size.

the gragh shows that the THD+N of R-2R VCS KIT is -110dB@5Vrms,only 1uV residual noise!
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File Type: jpg THD+N VS AMP @ 750 oHM loaded A-wei.jpg (89.9 KB, 1996 views)
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