Posts by jpm@aus.social
(DIR) Post #AzvalvJpSMC0fz6FPs by jpm@aus.social
2025-11-05T03:13:29Z
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Waitaminute that’s a fuse!
(DIR) Post #AzvalvxB63fUe1VfkW by jpm@aus.social
2025-11-05T03:20:17Z
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Brb going diggin’
(DIR) Post #AzvalwhyI56Az9P2ga by jpm@aus.social
2025-11-05T03:33:57Z
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Ok that’s the mains side opened up. The only safety device is a single fuse - earth is connected to the case and the entire PCB is floating in goo
(DIR) Post #Azvam7Xk0SS2abhWlc by jpm@aus.social
2025-11-05T03:53:36Z
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Ok that’s cute, I got an impression of the MOSFET in a piece of this goo
(DIR) Post #AzvamFrB64kiNCrAAq by jpm@aus.social
2025-11-05T03:54:37Z
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Hooray, unearthed a Y-class capacitor!
(DIR) Post #AzvamNibroeUkwuQvg by jpm@aus.social
2025-11-05T04:09:08Z
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A couple more impressions
(DIR) Post #AzvamW3SsA5UbwjCXw by jpm@aus.social
2025-11-05T04:39:35Z
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And there’s the DC side opened up
(DIR) Post #AzvameTzXQ3mkXCV0K by jpm@aus.social
2025-11-05T04:46:42Z
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And that’s as open as ICBF making it
(DIR) Post #AzvammeZ9zGw5eD3b6 by jpm@aus.social
2025-11-05T04:49:27Z
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Couple of detail shots
(DIR) Post #AzvamvA3WnDMTd0Jn6 by jpm@aus.social
2025-11-05T05:26:59Z
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How does this one fare overall? Better than the one I opened up a couple of weeks ago, but worse than the first one on this thread. On this one, there is no input filtering - no X-class capacitor across the input and no common-mode choke. Not strictly necessary but its absence suggests a fair amount of cost-optmisation has occurred which is a red flag. Good to see a proper Y-class capacitor inside, but missing a milled-out section between the line-voltage and ULV sides. Interesting design choice for the transformer in the middle to be floating on the goo, achieving the necessary separation between the two sides.
(DIR) Post #Azvan30mLAXypAj1RQ by jpm@aus.social
2025-11-05T05:30:18Z
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And the takeaway message? Buyer beware. If you’re not sure, just buy the Mean Well power supply even though it costs twice as much and is 3x larger for the same power output.
(DIR) Post #AzvanAw6sPZ9P0bPH6 by jpm@aus.social
2025-11-05T05:40:32Z
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Also, what even are X- and Y-class capacitors? They are capacitors that are designed to fail in a specific, known way. X-class capacitors are designed to fail electrically closed-circuit, and are usually placed between line and neutral for RFI filtering purposes. There should always be a fuse or other over-current protection device upstream of the capacitor, and many designs include a fuse on the circuit board itself to be damn sure. If there’s no fuse, then the fail-short will cause an electrical fire. Y-class capacitors are designed to fail electrically open-circuit, so in the event of a failure the capacitor will stop working but won’t let any electricity through to where it shouldn’t be.
(DIR) Post #B0AEPJD3XTT0F1ifCa by jpm@aus.social
2025-11-12T07:42:40Z
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@evcricket I have not regretted getting a Rancilio Silvia for my 40th birthday. The most complex electronics in it is a thermostat.
(DIR) Post #B0tGxe6qzvfzvwYH6O by jpm@aus.social
2025-12-04T02:10:18Z
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Fuck it, I’ll put cheese on it too
(DIR) Post #B1p7HZycbuqV0Czx20 by jpm@aus.social
2025-12-31T22:22:08Z
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@mos_8502 won’t be possible due to 3rd-party code critical for system operation: it embeds Veritas Volume Manager for its disk management. Upgrading to the full-featured clustered volume manager is just a license file instead of installing the full software suite.
(DIR) Post #B25xpzKnosjmgzmDHU by jpm@aus.social
2026-01-09T02:23:08Z
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@azonenberg the slow part is erasing, not writing
(DIR) Post #B25xq1apQGkFhHI2XQ by jpm@aus.social
2026-01-09T02:38:36Z
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@azonenberg each MLC page is much larger than SLC, so a read-modify-write of a block within a single page takes proportionally longer, even without considering flash erase time
(DIR) Post #B2881k0q03xKVMbK7c by jpm@aus.social
2026-01-10T00:31:48Z
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@gsuberland transparent trolling
(DIR) Post #B2GdC3Wix7vNlbaquG by jpm@aus.social
2026-01-13T22:23:24Z
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Today in “I’m not sure that’s even legal to sell to civilians” on AliExpress, it’s a FPV drone fibre optic kit #StraightOuttaShenzen https://www.aliexpress.com/item/1005010658684968.html
(DIR) Post #B2GdCBhIZh8X6ibPV2 by jpm@aus.social
2026-01-13T22:29:25Z
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I am not a professional droneologist though, maybe @Kels_316 knows?