Some holiday reading arrived for me today: Electric and Magnetic Interactions.
Electric and Magnetic Interactions
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Author Archives: Jay Jay
The End of the Full Bridge Rectifier?
A great video over here: The End of the Full Bridge Rectifier? (Sorry ElectroBOOM) Active Rectifier is here!.
You can find the equipment here: TEA2206, TEA2208.
Make: stuff
Today I came across these:
The problem with semver is Hyrum’s Law
Today I realised the problem with semver is Hyrum’s Law.
stat -c %a /tmp
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
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
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
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 It was an exercise in a book I’m reading: Introduction to Algorithms, 3rd Edition, which is obsolete now as the 4ed is out.
Disk setup/config reporting
Note to self: after configuring disks run the following commands to generate a report for the documentation:
- cat /proc/mdstat
- cat /etc/fstab
- zpool list
- zpool status
- zfs list
- zfs get dedup
- zfs get compression
New computer woes
My new server arrived today, but unfortunately it arrived damaged. I guess I will have to send it back… *sigh*.
