I found a good article explaining how pull-{up,down} resistors work and how to calculate appropriate values: Pull-up Resistors and Pull-down Resistors Explained.
Pull-up and Pull-down resistors explained
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Monthly Archives: February 2023
Current measurements
So I used my new cables in anger. I took a reading of the current draw on 300in1 project 155 that I was working on the other day. Will be able to experiment with the effect of using different resistors (and none at all).
Multi-meter cables
Made some cables. Male banana plug into male jumper wire. Got some of these and cut them. Made a pair of long ones and two pairs of short ones. This is so I can plug my multi-meters into my breadboards. Gonna do the same thing with some BNC attached coax so I can hook up my scope and with some female DuPont cables so I can plug into male pin headers.
Coax cable options
Today I got myself two of these RG316 coaxial cables. Other choices were RG58 and RG174 options. I found this discussion on reddit which suggested that for my application (connecting my bench scope to circuits for testing) any of them will probably do. I got two 4 meter cables, so when I cut them in half I will have four 2 meter cables.
The United States Frequency Allocation Chart
Some notes about how spectrum is allocated in the USA: The United States Frequency Allocation Chart
I must, must, must not get involved in radio. I would love to, but I don’t have enough time or money! Gotta stay digital… :P
Visual design rules you can safely follow every time
Some interesting rules of thumb for user interface design: Visual design rules you can safely follow every time.
One note I want to make for later on is to use #222222 instead of #000000 and #F2F2F2 instead of #FFFFFF.
Anatomy of a cheap USB to Ethernet adapter
An interesting write up concerning a shanzhai knock off: Anatomy of a cheap USB to Ethernet adapter.
SCSI / ATA Translation (SAT)
So “SAT” can stand for SCSI / ATA Translation.
Firefox snap, Ubuntu, EPSON printer not available
So I had to repave my primary workstation to fix a problem with my ZFS configuration (my ashift setting was causing problems) and things are mostly back online, but I wasn’t able to print from firefox for some reason.
I think the problem was that I had installed firefox prior to adding the printer. Anyway, long story short, this command seemed to fix the problem for me:
# snap connect firefox:cups-control
Bipolar Junction NPN and PNP transistors
I have attached some notes about bipolar junction NPN and PNP transistors.
