Ted Dunning
@bsky.tdunning.com
That spoon is bigger than it looks. And it isn't a fork (in the road)
Member of Apache Software Foundation, committer on many Apache projects, Fellow at HPE.
Member of Apache Software Foundation, committer on many Apache projects, Fellow at HPE.
The idea here is that as the inductance increases, it passes more of the input drive and the op-amp converts that to a nice pulse.
Simulating a component with a variable parameter makes this really easy!
4/🧵
Simulating a component with a variable parameter makes this really easy!
4/🧵
November 13, 2025 at 2:45 AM
The idea here is that as the inductance increases, it passes more of the input drive and the op-amp converts that to a nice pulse.
Simulating a component with a variable parameter makes this really easy!
4/🧵
Simulating a component with a variable parameter makes this really easy!
4/🧵
The cool (and simple) trick here is that the inductance of the coil is not specified with a constant value, but is given as {v(/slug)}. This says take the voltage of the labeled signal "slug" and use it as the inductance.
I guesstimated this voltage based on how fast a slug will fall.
3/🧵
I guesstimated this voltage based on how fast a slug will fall.
3/🧵
November 13, 2025 at 2:45 AM
The cool (and simple) trick here is that the inductance of the coil is not specified with a constant value, but is given as {v(/slug)}. This says take the voltage of the labeled signal "slug" and use it as the inductance.
I guesstimated this voltage based on how fast a slug will fall.
3/🧵
I guesstimated this voltage based on how fast a slug will fall.
3/🧵
Ooh ... fun. A friend is playing around trying to detect an iron slug falling through a coil.
To help with this worthy effort, I suggested some simple circuit designs and found out a) KiCAD has ngSpice built in and b) you can have variable inductances in a circuit!
#kicad #electronics
1/🧵
To help with this worthy effort, I suggested some simple circuit designs and found out a) KiCAD has ngSpice built in and b) you can have variable inductances in a circuit!
#kicad #electronics
1/🧵
November 13, 2025 at 2:45 AM
Ooh ... fun. A friend is playing around trying to detect an iron slug falling through a coil.
To help with this worthy effort, I suggested some simple circuit designs and found out a) KiCAD has ngSpice built in and b) you can have variable inductances in a circuit!
#kicad #electronics
1/🧵
To help with this worthy effort, I suggested some simple circuit designs and found out a) KiCAD has ngSpice built in and b) you can have variable inductances in a circuit!
#kicad #electronics
1/🧵
Looks like our Canadian friends are going to get quite a show tonight with the Aurora.
www.swpc.noaa.gov/products/aur...
www.swpc.noaa.gov/products/aur...
November 12, 2025 at 6:30 PM
Looks like our Canadian friends are going to get quite a show tonight with the Aurora.
www.swpc.noaa.gov/products/aur...
www.swpc.noaa.gov/products/aur...
Something strange happening with hertz. Pick any car in the gold zone, they said. Difficult choice it turns out. The white car in the distance isn't in the zone, btw. Also nobody in the office in the parking lot.
I've never seen this before.
I've never seen this before.
November 9, 2025 at 2:11 AM
Something strange happening with hertz. Pick any car in the gold zone, they said. Difficult choice it turns out. The white car in the distance isn't in the zone, btw. Also nobody in the office in the parking lot.
I've never seen this before.
I've never seen this before.
There's still time. If you haven't done it already, go vote!
November 3, 2025 at 9:09 AM
There's still time. If you haven't done it already, go vote!
Demonstrators in Palo Alto? Get distracted a bit!
October 18, 2025 at 10:12 PM
Demonstrators in Palo Alto? Get distracted a bit!
It turns out that a huge number of people stayed in the park and never marched
October 18, 2025 at 7:56 PM
It turns out that a huge number of people stayed in the park and never marched
Holy s*** this is bigger than before. San Jose has turned out in force!
October 18, 2025 at 7:35 PM
Holy s*** this is bigger than before. San Jose has turned out in force!
Grok doesn't think that the solution was correct, either.
Michael P Naughton didn't check his work but accepted an AI's hallucination. Some people will believe anything if you puff them up enough.
Michael P Naughton didn't check his work but accepted an AI's hallucination. Some people will believe anything if you puff them up enough.
October 18, 2025 at 3:45 AM
Grok doesn't think that the solution was correct, either.
Michael P Naughton didn't check his work but accepted an AI's hallucination. Some people will believe anything if you puff them up enough.
Michael P Naughton didn't check his work but accepted an AI's hallucination. Some people will believe anything if you puff them up enough.
Philosophical question here:
Does this picture show three pears or three pairs?
Does this picture show three pears or three pairs?
October 10, 2025 at 1:23 AM
Philosophical question here:
Does this picture show three pears or three pairs?
Does this picture show three pears or three pairs?
OK. I am running away for some fun.
Part of that fun involves the Road Lab (tm).
Spectrum analyzer, Raspberry Pico, frequency generator, mixer board, sample filters for sample loads. And lots of SMA cables. All in a box that measures 15 x 12 x 12 cm.
Part of that fun involves the Road Lab (tm).
Spectrum analyzer, Raspberry Pico, frequency generator, mixer board, sample filters for sample loads. And lots of SMA cables. All in a box that measures 15 x 12 x 12 cm.
September 20, 2025 at 8:00 PM
OK. I am running away for some fun.
Part of that fun involves the Road Lab (tm).
Spectrum analyzer, Raspberry Pico, frequency generator, mixer board, sample filters for sample loads. And lots of SMA cables. All in a box that measures 15 x 12 x 12 cm.
Part of that fun involves the Road Lab (tm).
Spectrum analyzer, Raspberry Pico, frequency generator, mixer board, sample filters for sample loads. And lots of SMA cables. All in a box that measures 15 x 12 x 12 cm.
September 16, 2025 at 3:47 PM
Our typical workflow is that she will spot the shot and take a rough and then I will get the final image, but it can go either way.
September 12, 2025 at 6:25 PM
Our typical workflow is that she will spot the shot and take a rough and then I will get the final image, but it can go either way.
My favorite is the 40-150 f/2.8 because of the stunning image quality.
September 12, 2025 at 6:11 PM
My favorite is the 40-150 f/2.8 because of the stunning image quality.
We have printed a few. We have an array of the 1MP prints in our house near the stairs.
I printed out this one, but never got it hung. I should do that.
I printed out this one, but never got it hung. I should do that.
September 11, 2025 at 8:24 AM
We have printed a few. We have an array of the 1MP prints in our house near the stairs.
I printed out this one, but never got it hung. I should do that.
I printed out this one, but never got it hung. I should do that.
Pixel 6 for day to day use, ancient EM-1 for more serious work.
Here's a shot from the Pixel and from the Olympus.
Here's a shot from the Pixel and from the Olympus.
September 11, 2025 at 8:14 AM
Pixel 6 for day to day use, ancient EM-1 for more serious work.
Here's a shot from the Pixel and from the Olympus.
Here's a shot from the Pixel and from the Olympus.
I couldn't find any of the award winning images from our old 1M pixel Cool Pix, but here are some nice shots with (only) 8MP.
It's not the wand. It's the wizard.
It's not the wand. It's the wizard.
September 8, 2025 at 4:22 PM
I couldn't find any of the award winning images from our old 1M pixel Cool Pix, but here are some nice shots with (only) 8MP.
It's not the wand. It's the wizard.
It's not the wand. It's the wizard.
My aunt is in the mountains she loved. This memorial is nearby.
If she were still with us, she definitely would have been out on the protest lines today. She had a keen sense of justice and what our country could be.
If she were still with us, she definitely would have been out on the protest lines today. She had a keen sense of justice and what our country could be.
September 1, 2025 at 10:52 PM
My aunt is in the mountains she loved. This memorial is nearby.
If she were still with us, she definitely would have been out on the protest lines today. She had a keen sense of justice and what our country could be.
If she were still with us, she definitely would have been out on the protest lines today. She had a keen sense of justice and what our country could be.
Who sells advanced mathematics isn't useful in everyday life?
I use the Banach-Tarsky theorem every time I toast cheese.
I use the Banach-Tarsky theorem every time I toast cheese.
August 24, 2025 at 2:02 AM
Who sells advanced mathematics isn't useful in everyday life?
I use the Banach-Tarsky theorem every time I toast cheese.
I use the Banach-Tarsky theorem every time I toast cheese.
My last photo in DC was from 2015 ... before we had a hell-hole president.
August 11, 2025 at 5:45 PM
My last photo in DC was from 2015 ... before we had a hell-hole president.
I expect that Mr. Geisler would be saying the same thing just about now.
August 11, 2025 at 1:01 AM
I expect that Mr. Geisler would be saying the same thing just about now.
Almost all.
This little crescent in Mission Bay in San Diego is a private beach. I believe that this is because the legacy property lines impinge on the high tide line making it impossible to reach the beach.
(I knew the owner of 1043 Briarfield)
More here: thewebsters.us/2019/05/26/t...
This little crescent in Mission Bay in San Diego is a private beach. I believe that this is because the legacy property lines impinge on the high tide line making it impossible to reach the beach.
(I knew the owner of 1043 Briarfield)
More here: thewebsters.us/2019/05/26/t...
August 9, 2025 at 6:40 AM
Almost all.
This little crescent in Mission Bay in San Diego is a private beach. I believe that this is because the legacy property lines impinge on the high tide line making it impossible to reach the beach.
(I knew the owner of 1043 Briarfield)
More here: thewebsters.us/2019/05/26/t...
This little crescent in Mission Bay in San Diego is a private beach. I believe that this is because the legacy property lines impinge on the high tide line making it impossible to reach the beach.
(I knew the owner of 1043 Briarfield)
More here: thewebsters.us/2019/05/26/t...
A tale of battle and tragedy in two pictures.
July 19, 2025 at 5:29 PM
A tale of battle and tragedy in two pictures.
Did you say you like overcast days? The leftmost picture is what counts as overcast, btw.
And not all of the walks are along the cliffs. Some really beautiful ones are, though.
And not all of the walks are along the cliffs. Some really beautiful ones are, though.
July 5, 2025 at 5:03 AM
Did you say you like overcast days? The leftmost picture is what counts as overcast, btw.
And not all of the walks are along the cliffs. Some really beautiful ones are, though.
And not all of the walks are along the cliffs. Some really beautiful ones are, though.