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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 Today, 12:24 PM   #461
jhofland is offline jhofland  United States
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Well, Hugh. I completely agree with your comment that it's beautiful work. But it's an encouragement for me to do what I can to improve my own skills.
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Old Today, 01:04 PM   #462
BigE is offline BigE  Canada
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Got my boards! I've never seen those tiny holes elsewhere. What are they for?
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Old Today, 02:15 PM   #463
xrk971 is offline xrk971  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
You must have not received any of JPS64's prior layouts before? The billion via stitching is a JPS64 trademark, but they do serve a function. They tie the top and bottom copper planes together for an ultra-low impedance electrical path. They are plated through with gold as well so turn the board trace into essentially a metal "foam" matrix. They provide extra mechanical strength and resist traces from peeling off. Plus, they help dissipate heat. Downside is that they are manually placed and that takes a lot of time. It's not a simple click a button to "fill" like a paint program. Hats off to JPS64 for making boards like this for us. However, you have to be extra careful when soldering not to make a solder bridge with the vias.
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Old Today, 02:36 PM   #464
BigE is offline BigE  Canada
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Can they be used in some way? Ie perhaps tied to safety earth?
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Old Today, 03:04 PM   #465
xrk971 is offline xrk971  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
Yes, they are used for ground plane, main signal path and also power rails. There is a strip on the top of the main Yarra board (not PSU). It should be tied to the earth ground tab on the Schurter IEC module. Connect it to the middle screw hole with a loop crimp connector screwed down to the board.
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