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Old 3rd January 2009, 06:28 AM   #21
bbp is offline bbp  China
diyAudio Member
 
Join Date: Sep 2005
Quote:
Originally posted by glt
Hi Lu,

Is 0 db position straight through (i.e., input shorted to output)?

Thanks.

Hi glt,

For this VOL kit based on the R-2R network, 0dB can not be set directlly. With a extra OPAMP to form a I/V translatetion part, 0dB is posiible. The output impedance will drop to nearlly 0 ohm when the I/V OPAMP added to this kit.


best regards
Lu
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Old 3rd January 2009, 02:44 PM   #22
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Join Date: Jul 2004
Location: Toronto, Canada
Hi Lu, just sent you payment for a stereo and a balanced kit. Thanks for making these available.

Do you have any information on the headphone amp from your website? Is that available as a kit?
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Old 5th January 2009, 12:31 PM   #23
bbp is offline bbp  China
diyAudio Member
 
Join Date: Sep 2005
Quote:
Originally posted by twitchie
Hi Lu, just sent you payment for a stereo and a balanced kit. Thanks for making these available.

Do you have any information on the headphone amp from your website? Is that available as a kit?

Many thanks twitchie

Do you mean HAK_ONE or Ortho No.1 ?

I post the PCB of HAK_ONE and the Test result of Ortho No.1 on my blog.

For HAK_ONE, I got many postive feedback from my friends, they say it is the best Headphone AMP for Audio-Thchnica ^_^

But I want to make the Ortho No.1 out frist, because to my listening, it is the best Headphone Amplifier for my HD650. Especially the BASS

May be 60 days later, the Kits of HAK_ONE will be available

I want sell make my Headphone Amplifier as a completed assembled product, not kits



the bandwidth of Ortho No.1 is wider than 0Hz to 2MHz
the picture shows the 2Hz square wave response:
Attached Images
File Type: jpg 2hz¸±±¾.jpg (61.0 KB, 1821 views)
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Old 5th January 2009, 12:37 PM   #24
bbp is offline bbp  China
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Join Date: Sep 2005
and the 100KHz :
Attached Images
File Type: jpg 100khz¸±±¾.jpg (48.7 KB, 1790 views)
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Old 5th January 2009, 11:08 PM   #25
sachi is offline sachi  United States
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Join Date: Dec 2003
Location: Silicon Forest
email sent requesting kit info and price.
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Old 6th January 2009, 02:47 PM   #26
diyAudio Member
 
Join Date: May 2005
Location: Madrid
Default Contact information

Hello bbp and all.

My name is Claudio and I live in Spain.
I became familiar with your attenuator kit reading a post about it at another forum.
As I have not posted much in this forum I am not allowed to send e-mail, so please let me know how to contact you via e-mail.
I visited your blog but could not find any contact info.

You can contact me at [my user name ]@terra.es

Regards,

R
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Old 6th January 2009, 05:23 PM   #27
diyAudio Member
 
Join Date: Jan 2009
Email sent requesting kit info and price
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Old 7th January 2009, 05:17 AM   #28
bbp is offline bbp  China
diyAudio Member
 
Join Date: Sep 2005
Quote:
Originally posted by mirage00
Email sent requesting kit info and price
Hi mirage00, please contact me with my email bbp6604560 at hotmail.com

I can not send the manual to you without your private email address





regards
Lu
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Old 7th January 2009, 05:19 AM   #29
bbp is offline bbp  China
diyAudio Member
 
Join Date: Sep 2005
Default Re: Contact information

Quote:
Originally posted by rodelius
Hello bbp and all.

My name is Claudio and I live in Spain.
I became familiar with your attenuator kit reading a post about it at another forum.
As I have not posted much in this forum I am not allowed to send e-mail, so please let me know how to contact you via e-mail.
I visited your blog but could not find any contact info.

You can contact me at [my user name ]@terra.es

Regards,

R
Dear Claudio, YGM
I add my email to my blog , thanks for your advice ^_^
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Old 7th January 2009, 08:00 AM   #30
johnYks is offline johnYks  Australia
diyAudio Member
 
Join Date: May 2006
Hello bbp (Zhen Lu)

Received the R-2R Attenuator with Remote Control V2 yesterday
I couldn't be more PLEASED! with it - it is EXCELLENT in every
way.

The Quality of the workmanship and of the product is first rate!

The Quality of the person behind the product is EQUALLY first rate
namely Zhen Lu (bbp)!

A superb product at minimal cost - product and person behind it
deserve the highest praise and recommendation - Thank You!

Yours Sincerely
John

PS
The item arrived in record time and was boxed and packed
asc well as required!
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