Dyneema Chainplate Loop Test #Shorts
https://cuddly.tube/videos/watch/a257fe5e-6d8a-4feb-95f3-a8646fc18231
#FR4
Bow Roller & Pulpit Deck preparation: DIY Boat Refit progress 11
https://cuddly.tube/videos/watch/258d6a94-ce3c-466f-8e96-a9859c1d7c4a
Bow Roller Dry Fit: DIY Boat Refit progress 9
https://cuddly.tube/videos/watch/146b8b5c-f4b7-4db2-9774-1a4b2c1386e9
More support for our new Bow Roller: DIY Boat refit progress 8
https://cuddly.tube/videos/watch/70e393ac-05c4-4172-8b41-5e2199de9b6e
Huge backing plate for our new bow roller: DIY Boat Refit Progress 6
https://cuddly.tube/videos/watch/e9c6b6ce-697f-4746-8a7c-a4f8f5f94841
Epoxy fairing of Bow Roller support: DIY Boat Refit progress 12
Homebrew TEM Cell Lets You EMC Test Your Own Devices https://hackaday.com/2023/11/02/homebrew-tem-cell-lets-you-emc-test-your-own-devices/ #lineimpedancestabilizationnetwork #electromagneticcompatibility #transvereelectromagneticcell #spactrumanalyzer #ToolHacks #impedance #testing #copper #LISN #emc #fr4 #TEM
@iyalei Hey, I finally tried the #FR4 build plate on my new #3dprinter today and it works really well!
Bottom surface looks great (like on glass) and it holds onto PETG & PLA nicely. Had to wait a long time (under around 40°C for PLA) to release the part without bending the plate.
I will try ASA filament next.
PCB Microsurgery Puts the Bodges Inside the Board
We all make mistakes, and there's no shame in having to bodge a printed circuit board to fix a mistake. Most of us are content with cutting a trace or two with an Xacto or adding a bit of jumper wire to make the circuit work. Very few of us, however, will decide to literally do our bodges inside the PCB itself.
The story is that [Andrew Zonenberg] was asked to pitch in debugging some incredibly small PCBs for a prototype dev board that plugs directly into a USB jack. The six-layer boards are very dense, with a forest of blind vias. The Twitter thread details the debugging process, which ended up finding a blind via on layer two shorted to a power rail, and another via shorted to ground. It also has some beautiful shots of [Andrew]'s "mechanical tomography" method of visualizing layers by slowly grinding down the surface of the board.
[Andrew] has only tackled one of the bodges at the time of writing, but it has to be seen to be believed. It started with milling away the PCB to get access to the blind via using a ridiculously small end mill. The cavity [Andrew] milled ended up being only about 480 μm by 600 μm and only went partially through a 0.8-mm thick board, but it was enough to resolve the internal short and add an internal bodge to fix a trace that was damaged during milling. The cavity was then filled up with epoxy resin to stabilize the repair.
This kind of debugging and repair skill just boggles the mind. It reminds us a bit of these internal chip-soldering repairs, but taken to another level entirely. We can't wait to see what the second repair looks like, and whether the prototype for this dev board can be salvaged.
Thanks to [esclear] for the heads up on this one.
#repairhacks #blindvia #bodge #copper #epoxy #fr4 #pcb #repair #trace #via
Unique Seven-Segment Display Relies on FR-4 Fluorescence
It's interesting what you see when you train a black light on everyday objects. We strongly suggest not doing this in a hotel room, but if you shine UV light on, say, a printed circuit board, you might see what [Sam Ettinger] did, which led him to build these cool low-profile seven-segment fluorescent PCB displays.
As it turns out, at least some FR-4 PCBs fluoresce under UV light, giving off a ghostly blue-green glow. Seeing the possibilities, [Sam] designed a PCB with cutouts in the copper and solder mask in the shape of a traditional seven-segment display. The backside of the PCB has pads for UV LEDs and current-limiting resistors, which shine through the board and induce the segments to glow. Through-slots between the segments keep light from one segment from bleeding over into the next; while [Sam] left the slots unfilled, they could easily be filled with solder. The fluorescent property of FR-4, and therefore the brightness and tint of the segments, seems to vary by board thickness and PCB manufacturer, but it looks like most PCBs will show pretty good results.
We'd say the obvious first improvement might be to cover the back of the display with black epoxy, to keep stray light down, and to improve contrast. But they look pretty great just as they are. We can also see how displays with other shapes, like icons and simple symbols. Or maybe even alphanumeric characters -- say, haven't we seen something like that before?
#Jute statt #FR4: Recyclingfähiges Platinenmaterial
https://www.heise.de/news/Jute-statt-FR4-Recyclingfaehiges-Platinenmaterial-6179518.html
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