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Cloning the HP3325A Option 002 - HV Output
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jcline01:
Hi Jared,

Thanks for providing all the work and for the PCB fab information,

I tried to have a company (Pad2Pad) make the board using your gerber files from google drive, but they said it would not work.

Here are their words:
"The top silkscreen is usable, however, the top masking layer provided encompasses the entire board profile and is not usable. We will require a new top masking layer to proceed."

Do you have any insight on a solution?

Also, is there another fab company that can make this happen?

I'm new to PCB fab, so sorry for the questions.

Thanks again,

Joe Cline, KN5U
TERRA Operative:
There is no top solder mask on this PCB to keep it more accurate to the original HP design, hence the top masking layer to exclude it.
You can tell your fab that they can delete the top mask entirely and only apply solder mask to the bottom layer.
jcline01:
Awesome - Thanks!
TERRA Operative:
No worries. :)

If you look back a little bit in the thread, or in the google drive link, you'll see photos of how it should look with the bare top. All nice and gooollldddd!

AVO8user:
Hi there, interested in building this, hope you still look at this after all this time. 
My query is about the BOM in the Google drive as there seem to be a couple of questions and comments in the forum which differ from the BOM you have put up.

1 Member P diddy refers to values for R10 and C19 but neither the HP service manual or your BOM have values or have them in the circuit schematic.

2 The next query is using 2N3904/06 transistors, again P diddy refers to the need to use 80v transistors in some locations which you agree with but the BOM lists 3904/06 throughout.

3 And finally in the blog you mention the 10k resistor should be 0.1% and say that you used 1% for the first build and will correct that in the next build, unfiortunatley the BOM still lists 1% parts.

Hoping you can help, is there a newer version of the BOM ?
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