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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 5h

I got the parts… fitted one up… plugged it into my benchtop supply (with current limit set)… that's funny, it's dropped to constant current mode! Pull out a multimeter, measure the resistance across the input… short circuit! Turns out, when I […] [Original post on mastodon.longlandclan.id.au]

Footprint comparison.

On the left, the L_CommonMode_Wurth_WE-CMB-S footprint from Kicad.

On the right, the footprint in the datasheet, rotated to match.

Symbol goes (clockwise from top left): 1, 2, 3, 4.
Datasheet goes: 4, 1, 2, 3.

Symbol in Kicad vs the symbol in the datasheet.

Both match in terms of pin numbering and function.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 19/10/2026

The actual PCBs arrived today. Much earlier than expected, which is good news. They were ordered through @aislerhq on the 30th, they shipped on the 6th and arrived today here in rainy Brisbane. They look good too. Means I better get cracking on the code for these things.

Two of the three manufactured boards, with the power supply module sat in its footprint on one of the PCBs for fit-testing.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 16/10/2026

…now the stylus is doing impersonations of the two front guitarists… where did I hide my stylus cleaner?

Macro shot of the cartridge and stylus after playing side 1… there's what looks to be the wisps of a small "beard" of dust hanging off the stylus.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 16/10/2026

Starting with this one, in memory of Frank Beard (1949-2026) and Dusty Hill (1949-2021).

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 15/10/2026

Of course, the real important bit is whether it worked. Damn, I think that pot has always been fiddly, and now I know why! Probably been like that for the better part of 30+ years. Replacing the pot, speed control is silky smooth at the 33⅓ and […] [Original post on mastodon.longlandclan.id.au]

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 15/10/2026

A quick trip to Jaycar, picked up a box of 500mA fuses, so I've taped some spares to the power lead and put a new one in the holder. Whilst I had it open, I removed the old pot and put a new one on. The new one has a longer shaft than the old one […] [Original post on mastodon.longlandclan.id.au]

Inside: the replacement pot in situ, with neat heat-shrink tubing over the terminals and a short length of blue wire linking wiper to the side of the pot.

Outside: the speed control pot now sits out about 5mm… but whatever.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 15/10/2026

Yep, the fuse has indeed popped. Interestingly, the holder appears to be able to take two different sizes, and ours has a smaller one fitted. Entry is via the bottom, so to get in: 1. grab a twist tie and tie it around the tone-arm to make sure […] [Original post on mastodon.longlandclan.id.au]

Close-up of the speed-select and adjustment assembly, with the potentiometer I need to replace.

Close-up of the speed-control pot showing the wiring a little closer.

View of the turntable with the platter removed.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 02/10/2026

Wonderful, so there's a "notification" bot that's going around badgering people to "verify" their accounts. Username of `NOTIFICATION` (sometimes with some letters replaced with digits)… so far observed on `mastodon.social` (blocked) and ` […] [Original post on mastodon.longlandclan.id.au]

Screenshot of one of the posts from @N0TIFICATI0N@vivaldi.net

@qldfire ᴏᴜʀ ᴀᴜᴛᴏᴍᴀᴛᴇᴅ ꜱʏꜱᴛᴇᴍꜱ ᴅᴇᴛᴇᴄᴛᴇᴅ ᴀ ᴍɪɴᴏʀ ɪʀʀᴇɢᴜʟᴀʀɪᴛʏ ᴡɪᴛʜ ʏᴏᴜʀ ᴀᴄᴄᴏᴜɴᴛ ᴀᴄᴛɪᴠɪᴛʏ.

ᴛᴏ ʀᴇꜱᴛᴏʀᴇ ꜰᴜʟʟ ᴠɪsɪʙɪʟɪᴛʏ ᴀɴᴅ ᴀᴄᴄᴇꜱꜱ, ᴘʟᴇᴀꜱᴇ ᴄᴏᴍᴘʟᴇᴛᴇ ᴛʜᴇ ᴠᴇʀɪꜰɪᴄᴀᴛɪᴏɴ ᴘʀᴏᴄᴇꜱꜱ.

→ ᴘʀᴏᴄᴇᴇᴅ ʜᴇʀᴇ: 🔗 [redacted link SHA256 cba570dc2824493d3c774037141e6b4ef0c3d5032e9e758985be9f5e110c669a]

ᴛʜᴀɴᴋ ʏᴏᴜ ꜰᴏʀ ʏᴏᴜʀ ᴜɴᴅᴇʀsᴛᴀɴᴅɪɴɢ!

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 29/09/2026

One small error I've just spotted… the pin numbering goes (left to right, top to bottom): 1243 whereas I had it going 2314. Switch the symbol, update the PCB netlist, told the PCB tool to re-generate the power planes… it fixed the wiring error […] [Original post on mastodon.longlandclan.id.au]

Render of the PCB concerned, it's a 80mm×100mm PCB featuring a Raspberry Pi Pico W controller, a stack of diodes as level shifters, and a number of connectors around the outside (UART, I²C, a keypad matrix, +12V in, +5V out, an ADC channel, and a display controller port).

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 29/09/2026

Silly electronics question for people… I'm building a circuit that needs to drive a LED dot matrix panel, which means I need a beefy 5V DC-DC power supply to step down from 12V. I found a suitable candidate: the Meanwell NID100-5. 5V 11A output […] [Original post on mastodon.longlandclan.id.au]

EMC suggested circuit for a Meanwell NID100 PSU.

We have a circuit with 3 polarised capacitors, a dual-inductor and the NID100 PSU.

- C1 and C2 are both 120µF 63V electrolytics
- C3 is a 22µF 35V electrolytic
- L1 is a dual-inductor with a Z symbol marked on it. No phase dots are shown. They're oriented horizontally, one either side of the Z.

- +Vin connects to C1+ through to left side / top half of L1.
- Right side / top half of L1 connects to C2+ into +Vin of NI100
- -Vin connects to C1- through to left side / bottom half of L1.
- Right side / bottom half of L1 connects to C2- though to NID100 GND, through to C3- out to -Vo.
- NID100 +Vo connects to C3+ though to +Vo

My interpretation of the EMC circuit, as drawn in Kicad.

J5 represents the +Vin (pin 1) and -Vin (pin 2) pins.

J6 represents the +Vout (pin 1) and -Vout (pin 2) pins.

C1 is as described in the previous circuit; C1+ connects to J1 Pin 1, through to pin 2 of FL1 (left side top inductor), a phase dot is shown here.

FL1 pin 3 (right side top inductor) connects to C2+ through to +Vin on the NID100.

J5 pin 2 connects to C1-, through to pin 1 of FL1 (left side, bottom inductor), a phase dot is shown here.

FL1 pin 4 connects to C2- through to GND, to C3- and out to J6 pin 2.

NID100 Vout connects to C3+ through to J6 pin 1.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 26/09/2026

"No I don't want you playing with NetBSD, my attention requirements are greater." #Caturday #CatsOfMastodon

Sam, a 11 year old Russian Blue cat is laying in front of my laptop on the table.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 25/09/2026

Regarding the fuse… haven't determined the form-factor, but as always, eBay has photos of it. (source: www.ebay.com/itm/401736720532 )

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 21/09/2026

RE: mastodon.longlandclan.id.au/@qldfir… Looks like my bot needs a config tweak with the stylesheet, but there is a #LeaveNow emergency warning for a fire near #GlenAplinQld south-west of #StanthorpeQld.

Screenshot from https://www.fire.qld.gov.au/Current-Incidents

The text of the message can be seen in the quoted post, but the map shows three fire grounds, two of which overlap.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 30/08/2026

I'll bet it's a blown fuse. The turntable was working last time I used it, but it's sat unused and unplugged for years. Suddenly sees current, *poof*.

Schematic for the RP-550 and RP-1001 turntables.

The power supply section shows a 500mA fuse just beyond one leg of the step-down transformer.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 25/08/2026

Really smacks of hypocrisy when Linus Torvalds tells us that AI use in the kernel is here to stay, yet `git.kernel.org` throws this up… (and yeah, it's crawling along because my CM5 is also doing a system update). #NoLLM

Screenshot of Anubis on git.kernel.org, "making sure" that I'm "not a bot".

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 12/08/2026

This is showing some promise… In the words of the Rolling Stones… you can't always get what you want, but if you try sometimes, you get what you need. I've got some ideas for what I'm calling the "STCLauncher" application… (STC = Skin The Cat… […] [Original post on mastodon.longlandclan.id.au]

A mock-up of a launcher showing a sub-menu of web browsers.

On the far left, we've got 90° rotated labels showing the names of categories that have been navigated into.

On the right is a list of application launcher icons.

There are some other icons for locking the desktop, switching users, shutting down, logging out, showing the desktop, a "restore" (can't remember what that does now… I did this mock-up in 2014), and a "back" and a "home" button.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 09/08/2026

The plot thickens… so I went to make a cup of tea… turn the kettle on. Nothing. No life out of the kettle. Glance over at the microwave oven, it's dead too. Unplug kettle, move it over to the other side of the kitchen, plug it in… turn it on… […] [Original post on mastodon.longlandclan.id.au]

GP1 circuit power usage, last 6 hours.

It's dead at 0W until about 10:15… when there's a sudden spike (inrush current charging capacitors probably), then a steady 300W load (100W reactive), before it resumes a somewhat noisy oscillation pattern like before.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 08/08/2026

Looks like we'll be fridge-shopping today. I got up, with one loudly meowing cat indicating his hunger… I get Sam's mince out and give him a spoon-full. Open the fridge to put the tray of mince back in… *BANG*… a flash erupted from the top-left […] [Original post on mastodon.longlandclan.id.au]

Waveform of active and reactive power for circuit GP1 in our house (which includes the kitchen).

Over the last few hours, there was a steady heartbeat… about 100W active load (-100W reactive) constantly, with the odd square-wave burst of ~220W (100W reactive) power usage when the compressor switches on.

This all stops abruptly at 06:47. From here, the circuit shows 0W (reactive or active) power consumption. The fridge is dead.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 08/08/2026

Around Brisbane, there's some hazard reduction burns taking place to try and reduce the fire load ahead of summer. Hasn't been too bad lately, but tonight I noticed I could smell smoke. It appears according to this graph, I'm not imagining it […] [Original post on mastodon.longlandclan.id.au]

PM2.5 levels at Upper Kedron today…

Since 1800, the PM2.5 levels have been on a steady upward curve, and as of 2000, are sitting at 23.3µg/m³.

25µg/m³ is the guideline… right now this is "fair" air quality… above this guide line we enter "poor" air quality, and sensitive groups (like myself) need to take precautionary measures.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 29/07/2026

I'm half way through 2026… and been catching the bus a lot more due to the fuel prices. The nearest I can get on the bus to my workplace is Paddington, just near the start of Caxton Street and Lang Park stadium. From there, it's a couple of […] [Original post on mastodon.longlandclan.id.au]

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 22/07/2026

Tell me you don't know how IPv6 addresses work without saying you don't know how IPv6 addresses work. #IPv6

$Screenshot from https://www.alldatasheet.net/datasheet-pdf/download/128748/NEC/WD37C65B.html showing a Java stack trace. HTTP Status 500 – Internal Server Error Type Exception Report Message An exception occurred processing [/download.jsp] at line [1765] Description The server encountered an unexpected condition that prevented it from fulfilling the request. Exception org.apache.jasper.JasperException: An exception occurred processing [/download.jsp] at line [1765] 1762: //subUtils = new SubnetUtils("183.104.0.0/11"); 1763: subUtils = new SubnetUtils("59.0.0.0/11"); 1764: subUtils.setInclusiveHostCount(false); 1765: bPass = subUtils.getInfo().isInRange(remoteIP); 1766: //홍콩서버 중국IP 체크 1767: boolean bChina = false; 1768: if(InetAddress.getLocalHost().getHostName().equals("all-hongkong-rocky10") || true) { Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:618) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:515) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339) javax.servlet.http.HttpServlet.service(HttpServlet.java:728) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) Root Cause java.lang.IllegalArgumentException: Could not parse [2001:44b8:21ac:7053:42a3:8dd8:71b7:9032] org.apache.commons.net.util.SubnetUtils.toInteger(SubnetUtils.java:333) org.apache.commons.net.util.SubnetUtils.access$200(SubnetUtils.java:27) org.apache.commons.net.util.SubnetUtils$SubnetInfo.isInRange(SubnetUtils.java:160) org.apache.jsp.download_jsp._jspService(download_jsp.java:2580) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:71) javax.servlet.http.HttpServlet.service(HttpServlet.java:728) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339) javax.servlet.http.HttpServlet.service(HttpServlet.java:728) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) Note The full stack trace of the root cause is available in the server logs.$

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 12/07/2026

This is what happens when contacts back out of SB-50 housings. These ones are so cheap, a quick yank of the cable pulls the cable and contact out of the housing. A genuine SB-50 will not let you do that. The end result is under spring tension […] [Original post on mastodon.longlandclan.id.au]

Melted blade fuse holders on a 5-way SB-50 PDU, indicating the bus bars got hot enough to melt the plastic nearby.

Somewhat melted moulded SB-50 housings in the side of the SB-50 PDU.

A badly charred negative terminal on a SB-50 PDU.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 11/07/2026

To get this far, you need to do these things: 1. partition NVMe with a GPT; first partition formatted FAT32 and set up as an EFI system partition in the partition table 2. unzip the release zipfile to that first partition 3. grab the device tree […] [Original post on mastodon.longlandclan.id.au]

UEFI menu system with blue and black text on a white background.

Unknown Raspberry Pi Model
BCM2712 (ARM Cortex-A76) 2.40GHz
v0.3 16384MB RAM

Select Language <English> This is the option
one adjusts to change
> Device Manager the language for the
> Boot Manager current system
> Boot Maintenance Manager

Continue
Reset

↑↓: Move Highlight <Enter>:Select Entry

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 08/07/2026

Making test calls to 000 I can understand, is wrong, and should not be done… it wastes operator time and resources. The only time I've "called" them in a non-emergency, it was an accidental pocket-dial. (Nokia had the presence of mind to include […] [Original post on mastodon.longlandclan.id.au]

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 06/07/2026

…and now Atlassian is trying to tell me things… scary!

Screenshot of an email in my inbox listing.

Subject: Set your new Atlassian password
From: Atlassian <noreply+acab50f@id.atlassian.com>

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 30/06/2026

These are the guilty culprits… one just replaced now, and I'll replace the other soonish. Right now #Ceph is getting re-acquainted with the data on the node I just brought back up today, and I'll wait for that to finish before I shut down the […] [Original post on mastodon.longlandclan.id.au]

Two 120GB WD Green SATA M.2 2280 SSD modules.
The top one has a manufacturing date of 14 MAR 2019.
The bottom one has a manufacturing date of 05 JAN 2021.

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 28/06/2026

Well, you picked a fine time to leave me boot disk… Along with your comrade, blowing my OS away… My pair of downed servers, 12TB of replicas… now my Ceph cluster won't heal… …you picked a fine time to leave me, boot disk! #HomeServer #Ceph

Screenshot from the BMC showing a resized snapshot of the console. We can vaguely see the text:

Intel(R) Boot Agent CE v1.5.48
Copyright (C) 1997 2003, Intel Corporation

PXE T61: Media test failure, check cable
PXE MBP: Exiting Intel Boot Agent

Reboot and Select proper Boot device
or Insert Boot Media in selected Boot device and press a key_

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Stuart Longland (VK4MSL) @stuartl.mastodon.longlandclan.id.au.ap.brid.gy · 26/06/2026

Design pro-tip for the ABC: white text on white background is unreadable.

Screenshot of https://www.abc.net.au/news/2026-06-27/h5-bird-flu-outbreak-numbers-overseas/106826956

We see the ABC News banner, then the only other text visible is:

Tessa Flemming
Avian Influenza
2h ago

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