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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
The YARRA Preamplifier/HPA for Melbourne DB Group Buy
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Old 16th July 2019, 02:30 AM   #761
bk856er is online now bk856er  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
My apologies - reading back what I wrote and it almost seems rude. Not complaining at all, just passing along packaging feedback. Very appreciative of your products and the work you put in. Your're right - small boards are probably not at risk. Still, interleaving with paper is easy-peasy and cheap!

BK
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Old 16th July 2019, 03:28 AM   #762
zman01 is offline zman01  Bangladesh
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
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Originally Posted by bk856er View Post
Still, interleaving with paper is easy-peasy and cheap!

BK
Good idea BK. That's how I store my PCBs.
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Old 18th July 2019, 10:57 PM   #763
skunark is offline skunark  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
What happened to the boards? They look very different from the first batch?

Also, please avoid using packing tape on the PCBs they are sticky
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Old 18th July 2019, 11:23 PM   #764
xrk971 is online now xrk971  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
Sorry about the tape. I ran out of blue tape. Some mineral spirits paint thinner should take it off easily.

These boards are now the v2 with tented vias where solder mask covers the vias to prevent inadvertent solder bridges. It was a highly requested feature - although the boards lose their bling.

This was mentioned in the thread earlier.
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Old 21st July 2019, 12:18 AM   #765
bk856er is online now bk856er  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
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Originally Posted by xrk971 View Post
Sorry about the tape. I ran out of blue tape. Some mineral spirits paint thinner should take it off easily.

These boards are now the v2 with tented vias where solder mask covers the vias to prevent inadvertent solder bridges. It was a highly requested feature - although the boards lose their bling.

This was mentioned in the thread earlier.
Received several boards today looks great!

Pro tip for tape residue removal: peel off tape in one piece if possible, then dab the residue with the sticky side of the tape you just removed, multiple times. Couple of minutes and perfectly clean. Quick wipe with isopropyl alcohol or flux remover and ready for soldering.

BK
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Old 23rd July 2019, 08:39 PM   #766
mnichols30030 is offline mnichols30030
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Default Annoted Raw BOM

Yarra Team and Builders,

A lot of work went into the design, testing, and documentation. Thank you for this effort. I am looking forward to assembling this project.

I do not fully understand the interaction between the Project links in the Yarra preamp forum and what appears on the Mouser website, but the Project list appears to be dynamic. I decided before submitting my order to Mouser to check the raw BOM (link found in post #1) and the Mouser Project as I linked to it and downloaded on 07/22/2019. (Note, I actually linked to the project twice and ended up with two different lists - there were a number of additions not related to the Yarra Preamp ).

The attached Excel file adds the Mouser information to the Raw File BOM in the columns to the right along with some notes. The worksheet provides a key to the items per the board layout and schematic and points out areas where you have some choices.

This is provided for reference and should not be used directly to generate an order - each line in the Raw file BOM has a part number, so for some items the part number will appear on multiple lines.

Now that the painful part is done, on to the fun.

Regards,

Mike
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File Type: zip YARRA_BOM_Annotated07232019.zip (26.1 KB, 24 views)
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Old 23rd July 2019, 09:13 PM   #767
xrk971 is online now xrk971  United States
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Hi Mike,
Thanks for pointing this issue out. We noticed this problem and asked folks to save the BOM link to their own project before modifying it - otherwise it reflects what the latest person who used it to modify for their own needs. Unfortunately, that’s the best we can do - maybe someone knows how to share a locked project list. So a little homework on your part is going to be needed.
Good luck with your build!
Cheers,
X
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Old 24th July 2019, 03:49 AM   #768
batty is offline batty  Australia
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PCBs arrived for the WBA18 and PCA daughterboards, just need to sort a BOM for them.
I have some matched pairs of 2SK170s so will use them.
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Last edited by batty; 24th July 2019 at 03:51 AM.
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Old 24th July 2019, 08:05 AM   #769
batty is offline batty  Australia
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Awesome PCBs, I must admit looking at them I have no idea how to go about finding parts and where they go, I was expect idents such as R1, C3 etc, but there are just numbers.
Is there a parts list and a diagram of what goes where?
please.
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Old 24th July 2019, 10:23 AM   #770
xrk971 is online now xrk971  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
Batty, the boards are so small that JP left the C or R off to save space. It’s pretty obvious what part is an R or C or V. But you should use the stuffing guide that is provided as it show orientation of the standing resistors. WBA18 one is here:
The YARRA Preamplifier/HPA for Melbourne DB Group Buy

There is one for the PCA somewhere in this thread too. Just need to look. I never got a chance to put a link in the first post yet.

BOM for PCA is here but the large source resistors need to be changed:
The YARRA Preamplifier/HPA for Melbourne DB Group Buy

The test build was here:

The YARRA Preamplifier/HPA for Melbourne DB Group Buy

Change to use either two 2w x 270ohm resistors or some other combo that is about 135ohms and can dissipate 1W. You have lots of choices. Four 0.5W 560ohms also work.
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Last edited by xrk971; 24th July 2019 at 10:33 AM.
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