Tag: power measurement

HP / HPE ProCurve 2910al-24G J9145A Switch teardown and shenanigans (WHL #108)

Earlier this year, I got my hands on a bunch of old HP switches, 20+4+x ports in 1U, in basic configuration without like fancy 10G addon cards. These were thrown out when my employer moved, but realistically, they should have been in the trash years ago. PCB date late 2008, component date more like mid-2009, so they were a solid 15 years in 24/7 operation. Good stuff.

So I had a peek. Like I always do :)

Hardware is of course ancient, the main processor is some (dual!) ARM11(56T2S) chip with ARMv6 architecture from like 2002. And while the thing has all the oomph it needs for 24/7 sustained 100% load on all ports with VLAN and filtering and sniffing, it’s doesn’t come lightly from a single ASIC like a modern switch would. […]

4th May 2025 5th May 2025 By Bzzz In No Comment

Kautschuk Platten Dämmmatten selbstklebend Isolierung XT | 32mm Dämmdicke (WHL #93)

Back to 3D printing for a bit – still lots of changes to the printer, but this one might be interesting to a wider audience: Thermal insulation of the print bed (hard data at the very end of this post!).

You see, the stock Ender 5 Plus printer bed comes pre-“insulated”:

Soo…that is a 3mm mat of black foam material that is glued down with some obnoxious acetone-soluble gunk, and garnished with a bit of aluminium foil on top. Yup, certainly better than nothing, but it doesn’t even cover the entire area, it’s just inside of the mounting frame. […]

4th February 2024 5th February 2024 By Bzzz In No Comment

Samsung USB 3.1 Flash Drive BAR Plus MUF-256BE3/EU – further degradation(WHL #45F1)

Well here’s a first :lol:
I’m about to RMA a piece of hardware, and I needed performance data from when the thing was new. Probably got a screenshot from back then, but searching for it on a machine that is inconvenient to access…just search the interwebs instead. And so I did, and entered the Google image search, and found what I needed. Yeah, turns out I just found my very own website. :unsure:

So, here’s the culprit again:

It’s not used that often, currently holds 110GB of WSUS data and some deep learning test dataset, so almost half of the drive is empty and performance is getting worse. […]

6th February 2022 6th February 2022 By Bzzz In No Comment

Fujitsu Esprimo E920 D3222-A12 12V/11Vsb to ATX conversion (#P28)

Recent hardware acquisition: Parts of an Esprimo E920 system (board, CPU, RAM and power supply) for replacing my main desktop system, a good old FX-6300 with 970 chipset board.

Why would I post about this? Well, it’s not a drop-in replacement. DIY required, since those OEM things always have some custom oddities. In this case it’s two (and a half) of them:

  1. Power supply has no ATX mounting bracket
  2. Power supply and board are not -12V/3V3/5V/5Vsb/12V units but 11Vsb/12V only
  3. Board has no I/O shield, just fitting case cutouts

Note that there are datasheets of this very Fujitsu board out there that show a regular ATX connector with all the standard voltages required. […]

2nd August 2020 3rd August 2020 By Bzzz In 9 Comments

Post #100 HP 6644A refurbishment (#P14)

Not that anybody cares, but this is actually post number 100 already. I prepared something else that failed (to be reported!), so this one has to do instead ;)

My “lab” power supply situation is ageing and often no longer up to the task, think of LEDs north of 35V or anything that takes more than one amp at voltages that cannot be provided with common computer supplies (3.3V, 5V, 12V, 19/20V) easily. So this is part one of the refresh.

I bought a HP 6644A power supply around six weeks ago off eBay, at 245€ including shipping and rack mounts via best offer. […]

23rd June 2019 20th June 2019 By Bzzz In 2 Comments

QI Wireless Charger Charging Pad for Samsung Galaxy S7 S6 edge Note 5 Nokia HTC 8X Google Nexus 5 6 7 Micro USB QI Phone Charger (WHL #32)

Here’s a random thing – a wireless Qi standard charger for phones!

I don’t even have a phone that is Qi compatible, but at work we’re looking into wireless power distribution AND data transfer at the same time. So I figured I can afford 1,74€ at AliExpress (mid-October) and get such an unit for myself. You know, dissect it, learn how it works, modify it to change characteristics. I previously had a look into the Royer converter or Royer oscillator for an entirely different thing – and here’s where ends meet. […]

11th November 2017 5th November 2017 By Bzzz In No Comment

USB detector 3.0 High voltage 4 bit OLED QC 2.0 Digital detector voltmeter ammeter voltage current power capacity tester meter (WHL #17)

New at Wan Hung Lo:

…wait, what?

(I’m pretty sure you’ll be able to find my address if you want to, just making it a little harder for google to index it as an image…)

So, what is it actually? Sure, it’s the USB power meter from the blog title. Who would have thought!
Bloody kids with USB 3 toys! Back in my days, we had…umm, good old RS-232 :lol:

I bought this one month ago at AliExpress for 8,61€ including shipping. As you can see, they decided to use some tracked mailing instead of the “ah, no worries” cheapo variant. […]

26th February 2017 3rd October 2020 By Bzzz In 3 Comments

DC 12V 5M 300LEDs Not Waterproof Single Color RGB LED Strip 5050 SMD 5630 3528 Flexible Light Neon Lamp Tiras LED Light Garland (WHL #7)

…also known as

NEW DC 12V Not Waterproof 5050 5630 3528 Single Color RGB LED Strip 5M 300LEDs Flexible Light Neon Lamp Tiras LED Light Garland

DC 12V 300LED 5M LED Strip 5050 RGB 5630 3528 3014 Not Waterproof LED Strip Light Flexible Neon Lamp Tiras LED Light Tape Stripe

or

5m/roll SMD 5630 DC 12V Not Waterproof LED Strip White / Warm White String Lights Fita Lamps for Home Lighting Cabinet Decorate

Well, you get the idea. It’s LED strips this time, and I chose 5630 size in warm white color. I’ve been ordering quite an amount of these, and in hindsight, I would rather buy A LOT of them instead of getting 1-2 reels at a time. […]

26th June 2016 26th June 2016 By Bzzz In 1 Comment

Weißen 128×64 0,96 zoll oled lcd led-display-modul für arduino 0,96″ IIC spi kommunizieren (WHL #6)

…Hi :cool:

I know, it’s been a while. Busy working, busy moving, busy buying metric shittons of furniture that’s not easily available in my size (or budget, or space, or all of them) and takes ages for delivery. Although this city is considered large for German terms, it’s not easy to get what you want – you might as well live in a backwater town. Well, actually I moved to such a lovely place and I couldn’t be more satisfied :)

About the promised “organic” next post: Here it is, I’m back. I’ll also throw in the other headline descriptions, as I actually bought another one for me (which I will review now), and two more for a work colleague who already snitched my first unit. […]

12th June 2016 12th June 2016 By Bzzz In 3 Comments

New at Wan Hung Lo: Open Source Hardware! Presenting the USB A-to-Micro bridge (WHL #4) (updated)

Oh well, I already announced it’s gonna be fake. But the other way round ;)

A while back, I saw the USB A-to-Micro bridge from youritronics. I already own one of these medium quality USB power meters that display voltage and current in an alternating fashion every few seconds. But complete control over power, data lines and also shielding is new. So I wanted one. In the short comment section however, someone noted that the signal routing probably isn’t the best. I had some spare time after Christmas this year, and I also wanted to test the Platinensammler (PCB aggregator) service from Jakob Kleinen. […]

1st February 2016 14th February 2016 By Bzzz In , , 2 Comments