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AT2380v2 2Ch Digitally controlled Stepped Attenuator
AT2380v2 2Ch Digitally controlled Stepped Attenuator
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Old 9th January 2018, 05:35 PM   #41
hallodeletue is offline hallodeletue  Germany
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Join Date: Oct 2011
Location: Goettingen
AT2380v2 2Ch Digitally controlled Stepped Attenuator
Hi Frex,

got the PCBs as well, beautiful work!

Thanks again for this cool project!

Best regards,

hallodeletue
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Old 24th January 2018, 04:03 PM   #42
mlloyd1 is offline mlloyd1  United States
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AT2380v2 2Ch Digitally controlled Stepped Attenuator
oops, i think i posted in the wrong group.
i received the boards.

thanks Frex!

mlloyd1
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Old 25th January 2018, 09:31 PM   #43
gazzagazza is offline gazzagazza  New Zealand
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Received in NZ a week ago. Thanks.
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Old 28th January 2018, 06:03 AM   #44
ymwong is offline ymwong  United States
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Join Date: Jan 2003
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AT2380v2 2Ch Digitally controlled Stepped Attenuator
Hi Frex,

PM'ed you. If you have some PCBs left, I would be interested in getting one.

Thanks,
ym
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Old 28th January 2018, 07:12 AM   #45
Frex is offline Frex  France
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AT2380v2 2Ch Digitally controlled Stepped Attenuator
Hello Ym,

Yes it is possible, PM sent.
Regards.

FRex
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Old 28th January 2018, 07:27 AM   #46
diyaudnut is offline diyaudnut  United States
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received the boards.

thanks Frex.
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Old 30th January 2018, 06:24 PM   #47
Frex is offline Frex  France
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Join Date: Nov 2009
AT2380v2 2Ch Digitally controlled Stepped Attenuator
Hello all,

I released today the new v0.23 CPLD firmware for the AT2380 that add :
- Firmware version display at startup
- Calibration mode.
- Relays fast mode operation (for audio volume control applications)
- Bluetooth UART mode attenuator control/measurements
and others code improvement and bugs fix.

Because of these many modifications, i have made a new design folder (v2.1).
A download link has been sent to all PCB buyers this day.

Note that the only change in bom file is to add 2x5pin header to allow jumper mounting.
Schematics as been updated only to show some new annotations.

So, manual is updated to include all new features and some corrections.
Building procedure has been also updated.


Frex
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Old 7th February 2018, 01:23 PM   #48
hallodeletue is offline hallodeletue  Germany
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Join Date: Oct 2011
Location: Goettingen
AT2380v2 2Ch Digitally controlled Stepped Attenuator
Hi,

Mouser order arrived, and I stole an hour of sleep to start the soldering...

This is the most complicated and challenging project in my DIY career so far, but Frex went a long way to put an excellent package together, thanks for that! The documentation is outstanding! A professional documentation couldn't be better and more in-depth, and this is a hobbyist effort for no profit at all. Your commitment to the DIY community is most generous!

So far, I soldered the ICs ... that CLPD in TQFP-100 case was a real challenge. I could not succeed with hand soldering, there was one short between pins that I couldn't get rid of. In the end, the cheap chinese hot air station that I had bought out of curiosity, and incredile amounts of flux solved the problem!

I believe I found one mistake in the BOM, U8 is supposed to be SOIC-8, but the Mouser part number is for VSSOP-8 case (BOM: 595-THS4531IDGKR , should be 595-THS4531IDR or 595-THS4531ID).

I hope I can continue tonight, sleep is precious, but curiosity kills the cat....


Best regards,

hallodeletue
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Old 8th February 2018, 01:02 AM   #49
bk856er is offline bk856er  United States
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AT2380v2 2Ch Digitally controlled Stepped Attenuator
Thanks for the heads-up on U8. My Mouser order literally just arrived (with VSSOP-8). Took nearly a week to ship evidently due to the large number of line-items after combining two big projects! They were nice enough to upgrade to overnight shipping. I think I'm going to stencil due to the TQFP-100 pitch.

BK
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Old 12th February 2018, 03:43 PM   #50
Frex is offline Frex  France
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AT2380v2 2Ch Digitally controlled Stepped Attenuator
Hello,

Indeed there is a mistake in the Mouser ordering code...
The right Mouser code is 595-THS4531IDR for the SOIC version (not VSSOP).
I sent right now the corrected bom file (Rev2) to all PCB buyers.
I apologize for this...

Frex
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