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-   -   FS:ultimate attenuator kit for audio,balanced/single-end (https://www.diyaudio.com/forums/swap-meet/163454-fs-ultimate-attenuator-kit-audio-balanced-single.html)

bbp 19th March 2010 11:10 AM

FS:ultimate attenuator kit for audio,balanced/single-end
 
3 Attachment(s)
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 ^_^
http://www.diyaudio.com/forums/swap-...ontrol-v2.html

http://www.diyaudio.com/forums/swap-...r-10-sets.html

http://www.diyaudio.com/forums/swap-...ntrol-kit.html

https://www.diyaudio.com/forums/atta...1&d=1268996959

https://www.diyaudio.com/forums/atta...1&d=1268996959

https://www.diyaudio.com/forums/atta...1&d=1268996959

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

thanks

bbp 19th March 2010 11:17 AM

information added

THD+N VS OUTPUT AMPLITUDE
https://www.diyaudio.com/forums/atta...1&d=1268997374

FFT @-20dBV
https://www.diyaudio.com/forums/atta...1&d=1268997374

Frequency Response
https://www.diyaudio.com/forums/atta...1&d=1268997374

CustomHT 19th March 2010 11:54 PM

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??

bbp 20th March 2010 12:33 AM

Quote:

Originally Posted by CustomHT (https://www.diyaudio.com/forums/swap-meet/163454-fs-ultimate-attenuator-kit-audio-balanced-single-post2125225.html#post2125225)
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

bbp 21st March 2010 03:07 AM

w/o any capacitor in the audio signal

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

easy to setup

bbp 9th April 2010 09:51 AM

Only balanced version available now

jtktam 9th April 2010 07:37 PM

would a chassis be available for this?

-joe

bbp 10th April 2010 01:07 AM

Quote:

Originally Posted by jtktam (https://www.diyaudio.com/forums/swap-meet/163454-fs-ultimate-attenuator-kit-audio-balanced-single-post2148346.html#post2148346)
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

bbp 17th April 2010 01:42 AM

New remote handset
 
1 Attachment(s)
aluminium remote handset updated

https://www.diyaudio.com/forums/atta...1&d=1271468512

bbp 22nd April 2010 09:06 AM

test performance added
 
1 Attachment(s)
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
https://www.diyaudio.com/forums/atta...1&d=1271926938

the gragh shows that the THD+N of R-2R VCS KIT is -110dB@5Vrms,only 1uV residual noise!


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