Author Topic: Fun for nerds (Read 197092 times)

RoGeorge · « **Reply #350 on:** April 28, 2022, 06:33:05 am »

Homemade Solar-Powered CNC Engraver
Cranktown City

~~LASER~~ Fusion engraver head!

RoGeorge · « **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 · « **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:

RoGeorge · « **Reply #353 on:** May 07, 2022, 07:49:19 pm »

Making Skin That Moves on Its Own
The Action Lab

It's alive!

RoGeorge · « **Reply #354 on:** May 08, 2022, 07:36:25 am »

Creating 10 apps in Python with PySimpleGUI
Clear Code

RoGeorge · « **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 · « **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

RoGeorge · « **Reply #357 on:** May 17, 2022, 05:53:56 pm »

20W Fiber Laser Etching PCB Coil
DIY-Optics dot com

RoGeorge · « **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 · « **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 · « **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.

RoGeorge · « **Reply #361 on:** June 01, 2022, 04:01:00 pm »

Learning to Teleport
Buttered Side Down

Ed.Kloonk · « **Reply #362 on:** June 04, 2022, 08:55:07 am »

RoGeorge · « **Reply #363 on:** June 04, 2022, 11:30:49 am »

Magnets are mad crazy, indeed!

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

RoGeorge · « **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