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Third Omicron Headamp Group Buy

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#42
The payment and shipping links were sent to those who provided their e-mails. The emails should be easily identifiable by the subject line "3rd Omicron Group Buy".

Kindly check the contents of your order - I did my best to avoid errors, but no one is perfect. If something is wrong or doesn't work, let me know either here, or via PM, or via e-mail. If you provided me an email address but have not received the link, check your Spam folder. Turns out, the test email I sent to myself last night ended up in Spam, so these things happen.

Three sets of boards have been promptly paid already - thank you! I will ship your boards today.

Those of you who have not provided me with an email address yet, please do so now.
 
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#43
The group buy fulfillment is under way. All participants should have received my e-mails, and 80% of orders are already shipped.

Note that those who are in the U.S. and chose First Class Mail as the delivery service will get no package tracking with USPS, as tracking is only available for the (more expensive) Ground Advantage shipping option. No tracking is not a problem, however, as USPS has been very reliable.

All other packages, including all international, can be tracked at the USPS web site. For international destinations, tracking is usually available from your local post office, which often provides more up-to date status from the moment the package lands in the your country.

Also, here are the links to the updated Mouser projects for Omicron TH and SMT versions:

Omicron TH - Mouser shared project
Omicron SMT - Mouser shared project

The projects were updated to reflect the current availability of the parts. I added these links to the main Omicron thread as well.
 
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#46
ElArte said:
I don’t recall if there’s a Mouser project for the PSU BOM?
Click to expand...
Here it is:

Shared Mouser project for the PSU board

Does not include the power transformer (see post #174 in the main thread for recommendations). Also, the project includes the heatsinks and the (optional) thermal pads, but not the hardware (2x M3x8 screws, 2x M3 nuts and washers) to attach the TO-220 regulators to the heatsinks.
 
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#53
Hi. I received the boards 15 minutes ago. Thank you!
Everything from Mouser came in already last thursday. There are still some smaller things to order (transformer and some pin receptacles) but I think I can start to solder next weekend. See you in the Omicron main thread.
 
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#59
My apologies - indeed, four 100-ohm resistors (R45, R46, R53, R54) were missing from the shared project, although included in the part list. Sorry about it.

I updated the shared project on Mouser and verified the rest of it against the full part list.

In case you already ordered the shared project without these resistors, you can use any general purpose 100 ohm resistors in these position, nothing special is required. The board is designed for axial resistors up to 7.5 mm long and 2.4 mm in diameter, which is the size of common 1/4W resistors. Carbon or metal film, 1% or 5% or even 10% tolerance will work just fine.

R45 and R46 are part of the output filter, and Omicron can be tested without them. R53 and R54 set the DC protection threshold; without them, the DC protection will not work correctly.
 
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