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AT2380v1 //  2 Channels digitally controlled stepped attenuator
AT2380v1 //  2 Channels digitally controlled stepped attenuator
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Old 14th October 2017, 06:49 PM   #21
mediatechnology is offline mediatechnology  United States
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Location: Dallas, Texas
Great work Frex!
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Old 14th October 2017, 09:38 PM   #22
jcga is offline jcga  France
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Join Date: Jun 2004
Location: Paris
Impressive ! as usual with your products
Jean Claude
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Old 1st November 2017, 05:49 PM   #23
Frex is offline Frex  France
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Join Date: Nov 2009
AT2380v1 //  2 Channels digitally controlled stepped attenuator
Hello all,

The AT2380 design is now finished and all work as a charm.
I made some modifications on the original design,and i add it
to the rev2 of schematic and a new PCB for a group buy.
Fully updated schematics and manual will be posted.
I started to make the promised video, but not yet ready.
Will come very soon...

Some pictures below of the finished prototype unit ( before upcoming movie...):

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Click the image to open in full size.


Note that I've verified successfully the attenuation level
up to -120dB by using 60dB external post amplifier.


If there is some people that want to build the project,
i can open a wiki page to make a preorder list for the bare PCB.
Comment welcome.
Regards.

Frex
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Old 1st November 2017, 06:05 PM   #24
jcga is offline jcga  France
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Join Date: Jun 2004
Location: Paris
Hi Frex,

Quote:
Originally Posted by Frex View Post
Hello all,

If there is some people that want to build the project,
i can open a wiki page to make a preorder list for the bare PCB.
Comment welcome.
Regards.
Frex
I'm in for one
JC
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Old 3rd November 2017, 06:44 AM   #25
hallodeletue is offline hallodeletue  Germany
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Join Date: Oct 2011
Location: Goettingen
AT2380v1 //  2 Channels digitally controlled stepped attenuator
Impressive and excellent work. I would also buy a board.

BR hallodeletue
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Old 3rd November 2017, 06:43 PM   #26
Frex is offline Frex  France
diyAudio Member
 
Join Date: Nov 2009
AT2380v1 //  2 Channels digitally controlled stepped attenuator
Arrow Video presentation.

Hello,

I just finished the two presentation videos of the AT2380, you can look them here :

AT2380 DIY 2 channels digitally controlled stepped attenuator- Introduction video Part 1/2

AT2380 DIY 2 channels digitally controlled stepped attenuator- Introduction video Part 2/2


Please, be indulgent if my English is not top notch !

(Note that in second video, i made a mistake, at time 3.39 you must ear
"the difference between effective OUTPUT signal and dBV setting for the output". )


Frex
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Old 11th November 2017, 08:50 AM   #27
jhenderson01075 is offline jhenderson01075  United States
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Join Date: Nov 2004
Location: So. Cal
Default Group buy

I'd purchase a board also.
__________________
Jim
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Old 20th November 2017, 04:16 PM   #28
Frex is offline Frex  France
diyAudio Member
 
Join Date: Nov 2009
AT2380v1 //  2 Channels digitally controlled stepped attenuator
Hello all,

I post the final revision 2.0 of the schematic now.
I update also the first post of the thread with all new data.
You can download it below :


AT2380V2_sch.pdf


The corresponding PCB is nearly finished, and i add some
improvement from prototype.

I also wrote the user manual of the attenuator to explain how
to use it. It include also an extended measurements report made in my lab on the prototype.
You can download it below :


AT2380v2_Manual_v0.pdf



The complete bill of material file with price list will come too.
I will open the wiki group-buy page on next week-end.

Frex
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Old 20th November 2017, 04:45 PM   #29
jcga is offline jcga  France
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Location: Paris
Even a well made manual
JC
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Old 21st November 2017, 09:34 AM   #30
hallodeletue is offline hallodeletue  Germany
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Join Date: Oct 2011
Location: Goettingen
AT2380v1 //  2 Channels digitally controlled stepped attenuator
Ah, great news! I am really looking forward to the PCBs, that would make a great project for the Christmas holidays.

Best regards,

hallodeletue
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