Tag: usb

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USB C cable mysteries

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TL;DR: The USBC is just a connector that can support multiple functions on each device. USBC cables themselves are different depending on what functionality they support. But in a major screwup, there is no labelling cables and sometimes even on devices to know what is supported. So you cannot know if you can get function X from the first device, the cable and the second device when connected together. Intro Let’s say your friend gives… Continue reading

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Why we need USB charging on everything

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Intro USB Power Delivery charging is coming to more and more devices, after is has been added to the USB standard along with the introduction of USB-C connectors. The standard allows devices and chargers to talk to each other and negotiate what sort of power devices need, while also talking to cables to see how much current they can carry. It’s been adopted as a universal way to charge many kinds of devices by the… Continue reading

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GPP-4323 power supply review

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Intro I spent quite a bit of time trying to design a digitally controlled power supply. I even have some prototypes and three articles, Part 1, Part 2 and Part 3. One day it hit me: across the years, I built multiple prototypes, spent a lot of time on it and never ended up anywhere. Why? because I did not really need one and I did not have any pressure to build one. So this… Continue reading

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Bosch glue pen teardown

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Intro My cheap plug in hot glue gun died and looking for a replacement I found this: the Bosch GluePen What does it do? it’s a hot glue gun for 7 mm glue sticks that warms up in 15 seconds. Charges via micro USB. Much better than my old one that needed ~5 minutes to warm up for probably half a minute of gluing. I am very happy because of the fast warm up, wireless operation… Continue reading

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Analog Discovery USB isolation

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Intro Back when I was deverloping the PSU burner, I wanted to have the Analog Discovery isolated from the common ground, to avoid noise and other issues. Since I did not have a way to do this, I ended up using a laptop on battery for measurements. But for long term, I needed to have this isolation. Unfortunately, things that can isolate USB at 480Mbps or faster are too expensive to justify. The solution The… Continue reading

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Cheap China

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My experiences and recommendations for cheap electronic modules from China. Continue reading