### Author Topic: Fun for nerds  (Read 174123 times)

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#### RoGeorge

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##### Re: Fun for nerds
« Reply #350 on: April 28, 2022, 06:33:05 am »
Cranktown City

#### RoGeorge

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##### Re: Fun for nerds
« Reply #351 on: May 02, 2022, 04:31:28 pm »
You have a disconnected mains transformer, and with no load attached (open secondary).
At what moment in the sinusoidal mains voltage do you connect the primary to the mains?

a.  During a zero-crossing in the sinusoidal mains voltage.
b.  During a peak voltage in the sinusoidal mains voltage.

Why?

ElectronicBits#10: Connecting inductive loads to the power line
Sam Ben-Yaakov

#### RoGeorge

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##### Re: Fun for nerds
« Reply #352 on: May 05, 2022, 10:47:21 pm »
The Bit Player | Claude Shannon | Father of Information Theory | IEEE Information Theory Society
Vaibhav Patil

Also found out about Claude Berrou's Turbocodes
Near Shannon Limit Error-Correcting Coding and Decoding: Turbo-Codes

and discovered the voice of Teddy Grace:

« Last Edit: May 05, 2022, 11:10:21 pm by RoGeorge »

#### RoGeorge

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##### Re: Fun for nerds
« Reply #353 on: May 07, 2022, 07:49:19 pm »
Making Skin That Moves on Its Own
The Action Lab

It's alive!

#### RoGeorge

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« Reply #354 on: May 08, 2022, 07:36:25 am »
Creating 10 apps in Python with PySimpleGUI
Clear Code

#### RoGeorge

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« Reply #355 on: May 12, 2022, 10:55:15 pm »
A Picture of the Milky Way's Supermassive Black Hole
Veritasium

Phased arrays are cool!

#### RoGeorge

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##### Re: Fun for nerds
« Reply #356 on: May 16, 2022, 07:59:36 am »
Solar, low energy Curie motor
xofunkox-scientific experiments

Quote
A 0.2 mm alumel wire is attached to the circumference of a mica disc with thin copper wire. This alloy has a Curie point of 152°C and consists of 90.7% nickel, 3.1% manganese, 4.2% aluminum and 2.0% silicon. The low Curie point and the low-friction bearing allow operation with a 50 mm burning glass.
Source:  From the video description
« Last Edit: May 16, 2022, 08:03:29 am by RoGeorge »

#### RoGeorge

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##### Re: Fun for nerds
« Reply #357 on: May 17, 2022, 05:53:56 pm »
20W Fiber Laser Etching PCB Coil
DIY-Optics dot com

#### RoGeorge

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##### Re: Fun for nerds
« Reply #358 on: May 22, 2022, 06:39:36 pm »
TSP #207 - Teardown & Detailed Analysis of Qualcomm's 60GHz Multi-Panel Phased Array WiGig System
The Signal Path

#### RoGeorge

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##### Re: Fun for nerds
« Reply #359 on: May 23, 2022, 09:22:14 am »
Slowing The Speed of Light Down To 2 m/s—What Special Relativity Feels Like
The Action Lab

#### BU508A

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##### Re: Fun for nerds
« Reply #360 on: May 23, 2022, 08:37:09 pm »
3blue1brown is discussing this little innocent task:

"Find the number of subsets of {1, ..., 2000}, the sum of whose elements is divisible by 5."

Spoiler:
It includes complex numbers and a reference to the Riemann Zeta-function.
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -

#### RoGeorge

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« Reply #361 on: June 01, 2022, 04:01:00 pm »
Learning to Teleport
Buttered Side Down

#### Ed.Kloonk

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##### Re: Fun for nerds
« Reply #362 on: June 04, 2022, 08:55:07 am »
iratus parum formica

#### RoGeorge

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##### Re: Fun for nerds
« Reply #363 on: June 04, 2022, 11:30:49 am »

Eddy current experiment with HDD components

Eddy current experiment with big Heat Sink

NETHERLANDS: BRITISH & DUTCH SCIENTISTS MAKE FROG FLOAT IN MID-AIR

Everything Is Magnetic! Moving Water With Magnets And Levitating Frogs

Then there is the Levitron, that apparently defies Earnshaw's theorem

Levitation with the Levitron

« Last Edit: June 04, 2022, 11:33:09 am by RoGeorge »

#### RoGeorge

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##### Re: Fun for nerds
« Reply #364 on: June 06, 2022, 12:59:37 pm »
Laser Decapsulation SSD CPU RAM
DIY-Optics dot com

Quote
namregpxp, 1 hour ago
How do you got such a machine?

DIY-Optics dot com, 1 hour ago
I bought mine from Cloudray. It's a 20W, 120ns fiber laser with 10kW peak power. You can process with it a variety of materials but mainly metals.. Marking, engraving, cleaning, cutting, heat treatment, decapsulation, color marking, PCB prototyping and a lot more

#### RoGeorge

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##### Re: Fun for nerds
« Reply #365 on: June 19, 2022, 07:53:18 am »
Dynamic balancing with a scope and small speaker
Matthias random stuff

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#### RoGeorge

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##### Re: Fun for nerds
« Reply #366 on: June 23, 2022, 05:29:11 pm »
How Does The Wyrd Mechanism Work?
The Action Lab

#### RoGeorge

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##### Re: Fun for nerds
« Reply #367 on: June 28, 2022, 11:59:36 am »
OpenAI Codex Live Demo
OpenAI

#### BU508A

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##### Re: Fun for nerds
« Reply #368 on: July 02, 2022, 04:22:11 pm »
Mullard is showing how to produce vacuum tubes:

“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -

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#### RoGeorge

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##### Re: Fun for nerds
« Reply #369 on: July 03, 2022, 03:12:30 pm »
Can Gyroscopes Provide Free Energy For The Planet?
The Action Lab

#### Ed.Kloonk

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##### Re: Fun for nerds
« Reply #370 on: July 04, 2022, 05:50:46 am »
Returning to the moon would be shocking.

iratus parum formica

#### BU508A

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##### Re: Fun for nerds
« Reply #371 on: July 09, 2022, 01:29:31 pm »
A review of some games which are quantum physics based by Sabine Hossenfelder:

“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -

#### Neper

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« Reply #372 on: July 09, 2022, 01:46:00 pm »
Mullard is showing how to produce vacuum tubes:

Here's how to make one at home:

If I knew everything I'd be starving because no-one could afford me.

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#### RoGeorge

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##### Re: Fun for nerds
« Reply #373 on: July 10, 2022, 10:12:56 am »
Burning Pictures on a Compact Disc Surface
arduinocelentano
Sources:  https://github.com/arduinocelentano/cdimage

#### Ed.Kloonk

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