John's blog

Talking about technology (mostly)

About Jay Jay

Hi there. My name is John Elliot V. My friends call me Jay Jay. I talk about technology on my blog at blog.jj5.net and make videos about electronics on my YouTube channel @InTheLabWithJayJay.

stat -c %a /tmp

Posted on 2022-12-15 [Thursday] by Jay Jay

So you can use `stat -c %a $path` to get the octal spec for use with `chmod`:

# stat -c %a /tmp
1777
# stat -c %a /
755

My solder

Posted on 2022-12-13 [Tuesday] by Jay Jay

My solder is Loctite (Multicore) 60/40 C511 5C 0.56mm 0.25kg. It’s a 60/40 tin/lead alloy. Diameter is 0.56mm. I think the melting point for tin/lead alloy is around about 180-190°C.

I’m gonna get myself some lead free solder, probably this 812020 Solder Wire, Lead Free, High Activity, 0.5mm Diameter, 217°C, 250g, Alloy 97.1, 2.6, 0.3 Sn, Ag, Cu.

ASX00031 Breakout Board

Posted on 2022-12-13 [Tuesday] by Jay Jay

So I came across this ASX00031 Breakout Board. Not gonna order one today, but looks like it might be the sort of thing that would come in handy.

Comparison of algorithm running times

Posted on 2022-12-13 [Tuesday] by Jay Jay

So I put this together. It’s a comparison of various Big-O running times. It was an exercise in a book I’m reading: Introduction to Algorithms, 3rd Edition, which is obsolete now as the 4ed is out.