I randomly found a 6V6GTA vacuum tube in the rubbish bin of a used book store. They wanted 3$ for it – how could I not? Visually, it did not have any indication of failure, or any mechanical rattling. So it might actually be functional! They did warn me that they had no idea if this was the case though :)...
Size is 5cm x 5cm....
The original board was too large. So I redesigned it to be about 12mm x 45mm. I can get a panel of 12 of these for about 3$ and cut out the individual units myself. So that’s about 0.25$ per board which is pretty good!...
So I decided to try out a local board manufacturer (thegioiic.com). Their online order form was pretty good (with instant quote), and I could just send them the Gerber files from KiCAD....
You those software projects that have no defined scope, budget, or timeline? Yet somehow land on your desk?...
TLDR; if you message the user kong_ming on this instance with a question, it will return a judgement from the Book of Changes, an ancient text used in divination....
What I've done is take a large 2n3055 BJT NPN power transistor, and decap it (it is a large metal-can type). Then I carefully removed any coating from the exposed silicon (it typically has a dab of silicone potting compound on it)....
This is a story about something that was entirely unlikely to turn our wholesome, but somehow did....
I'm sure someone was complying maliciously here, but I'm not sure who....
This is sometimes my example for 'why paying attention to documentation is important'. I didn't take the photo myself, a colleague sent it to me years back.
It’s a whip scorpion – harmlessly sprays acid at you when annoyed....
First off, yes my oscilloscope screen is dying. It’s very old. It’s a portable unit I carry around for testing, the good scope stays in my home lab....
I saw this neat particle spectrometer (also works as a detector) published under CERN’s open hardware license: scoollab.web.cern.ch/diy-particle-detector...
