Tag: voltage measurement

Bosch Professional GAA 18V-24 USB charging adapter 1600A00J61 1600A00J5W (WHL #49)

Something out of the ordinary for today, a brand new item, bought for disassembly and kind-of off-label use. A Bosch Professional USB charger which happens to have a 12V port also…

Contrary to my very first thought when I found this charger, it does NOT allow 18V batteries to be charged from USB or a 12V source. Maybe I should test that, but I doubt it. However, it does convert the other way – stick in a 18V power tool battery (ranging from 1.5Ah to 12Ah as of today) and get a USB charger with a lot of oomph, or a “heated jacked” power source with a lot of potential for baggy pockets. […]

12th May 2019 12th May 2019 By Bzzz In No Comment

BenQ EX3501R 3440×1440 21:9 35″ Curved VA monitor – AMA modes revisited for response time measurements (WHL #33F3)

Finally got a photo diode for re-measuring the panel response time of the BenQ EX3501R. It’s a Vishay BPW34 type with 7.5mm² of active area, 70pF of capacitance at 0V, 600 to 1050 nm of spectral bandwidth (Reichelt claims quite a bit more?), peak sensitivity at 900nm and a relatively big half sensitivity angle of 65 degrees. Yeah, capacitance goes down when reverse biasing it, whatever, just slap it onto a probe and let’s go:

It’s not perfectly aligned at the screen, but that shouldn’t do much. I’m running GIFs with #000000, #7F7F7F and #FFFFFF frames, flickering at 20Hz. […]

28th January 2018 29th January 2018 By Bzzz In 1 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