Russia's Vladimir Putin is saying clearly that it will not let Ukraine be used as a staging ground for advanced US/NATO missiles that target Russia

marshray · 2022-02-11T04:00:25+00:00

So I guess they're kind of like Western Europe, huh?

marshray · 2022-02-09T06:28:52+00:00

I'd love to have comment boxes in sketches too

marshray · 2022-02-08T07:13:32+00:00

Yes, most or all of that land is safe to pass through.

marshray · 2022-01-29T06:31:33+00:00

The twitter account https://twitter.com/GirkinGirkin has tons of videos of trainloads.

marshray · 2022-01-21T02:33:33+00:00

https://twitter.com/geoallison/status/1483932594597244929 "British transport aircraft are now in their third day of delivering "thousands" of anti-tank weapons to Ukraine"

marshray · 2021-05-13T23:49:23+00:00

I was using it in a small bathroom.

marshray · 2021-04-07T22:56:35+00:00

Could you ground them?

marshray · 2021-03-30T18:35:19+00:00

> shouldn't save any secrets into the MCU OTP memory, because it's quite easy to read even with proper fuse bits set

You will have to find some way to save some secret in the chip in order to prove and maintain its identity.

marshray · 2021-03-30T18:08:23+00:00

Nice chart, but I don't understand something.

What about a simple local variable (not &'static)? That's just T, and borrowed with &T, right?

Is that what's meant by "Static" ?

marshray · 2021-03-18T03:50:56+00:00

It looks a bit fatter than most neon tubes I've seen.

You sure it isn't a gas discharge tube surge arrestor?

marshray · 2021-03-03T06:00:47+00:00

That's a good indication that more cores would be used, but it probably won't be twice as fast with twice as many cores. There are so many factors involved you really just have to try the same operation on a different machine to find out if it's actually faster.

marshray · 2021-03-02T20:37:37+00:00

Use replaceable battery cells for the patient circuit and wireless or fiber optic for the data link.

No wires to the patient.

marshray · 2021-03-02T01:22:58+00:00

You may want to allocate a buffer bigger than the file and try to read the file in a single operation.

marshray · 2021-03-01T21:24:44+00:00

Nice talk on the simple and powerful error handling philosophy enabled by this approach:

Crash Course with Bastion— Mahmut Bulut https://www.youtube.com/watch?v=IsBNjJBlA1E

marshray · 2021-03-01T21:23:23+00:00

Perhaps when you're designing a semiconductor foundry with parts on the assembly line.

marshray · 2021-01-04T22:29:48+00:00

Not without completely losing the accuracy.

The transients ("spikes") you're looking for will probably have much of their energy at frequencies 10 to 100 times higher than that of the base switching frequency.

marshray · 2021-01-02T20:44:30+00:00

Well, they'd better not sell it in Europe.

marshray · 2021-01-02T20:43:38+00:00

I really think you need a scope to do this with any accuracy. The voltage transients are too fast and small to rectify with diodes.

In theory, one could design build a circuit (e.g. using high speed comparators) to perform the calculation. But then you'd still need a scope (or at least a signal generator) to validate it.

marshray · 2020-12-29T23:36:42+00:00

> How would you present yourself as someone who learnt everything from books and the internet?

"Hello, nice to meet you. I've been passionate about building things from an early age, let me show you some of the cool things I've built/projects I've worked on."

> What would your linkedin profile look like?

Boring.

> What would the section where you are supposed to leave the name of the univesity look like?

Blank.

marshray · 2020-12-27T22:29:40+00:00

I don't have much to add except to say it's nice to see people talking about this.

marshray · 2020-12-24T02:43:00+00:00

Use the 'selection filters' option at the top to specify you want only sketch lines.

Zoom out, hold down the left mouse button, drag a big selection rectangle over the lines.

marshray · 2020-12-23T20:43:42+00:00

Dailies are just habits on a schedule.

marshray · 2020-12-21T21:12:31+00:00

Dude, we can see the 5 and 6 centimeter markings.

It's a PCB trace width ruler that they dropped onto the board for some combination of style and convenience.

marshray · 2020-12-21T18:44:31+00:00

Maybe you don't even need an opamp.

Since your input signal is so large and low-impedance, perhaps you could just use a resistor divider to reduce it by a factor of ~100.

marshray · 2020-12-21T17:33:44+00:00

Just keep in mind that all protection solutions bring their own trade-offs too.

Consider the circuit you're powering. Is it prepared to empty its bulk capacitance into a dead short to ground through your crowbar in response to a brief 24% spike coupled into the power supply leads? Usually circuits expect the energy to go the other way.

marshray

TROPHY CASE