Fun for nerds

[RoGeorge]

I'm Back!
Zogg from Betelgeuse



 

[RoGeorge]

Marconi magnetic detector demonstration
glasslinger



 

[T3sl4co1l]

[RoGeorge]

Series circuit - 3 LEDs
Henryk Gasperowicz



 

[RoGeorge]

Honeypot Ants Turn Their Biggest Sisters into Jugs of Nectar
Deep Look



 

[timenutgoblin]

ASMR Satisfying Chip Capacitor Solder Reflow 

[RoGeorge]

Nice close-up!

Though, it looks like the solder didn't wet to the PCB pads very well, is it?  I was expecting the solder to wet the PCB pads, and to flow more on the PCB pads, too, so to to produce a concave solder joint surface.  Here, the final solder surface is convex, in the shape of a half small bubble (on the capacitor's pad). 

I'm not experienced enough in SMD reflow, isn't it too little solder paste there?

[timenutgoblin]

I agree with your observations. I cannot speak for the video or the setup that was used. I think the video is intended for demonstration purposes. I think they used a test jig for this, but I don't know.

It looks like the capacitor is 0402 (imperial) or maybe smaller? It might explain the visible solder balls in the paste. It would be interesting to know the soldering standards for Class 1, 2 and 3, etc.

[BU508A]

Fun with electrical shocks in the 1860's:



 

[RoGeorge]

The book he was talking about:  The Magician's Own Book, or, the Whole Art of Conjuring by Arnold and Cahill, published in the year 1862. 

[RoGeorge]

1958 "ABOVE AND BEYOND" NASA SOLDER & SOLDERING TECHNIQUES ELECTRONICS INSTRUCTIONAL FILM XD48824
PeriscopeFilm



 

[RoGeorge]

Gridfinity: Your Ultimate Modular Workshop is FREE!
Zack Freedman



lab@home:~$ sudo workbench aoutoclean 

[Ed.Kloonk]

An old clock.

[Gregg]

Here are some pictures of the clockworks in the Sather Tower at UC Berkeley:

[BU508A]

How to make a monolithic telescope

Part 1: Optical design:


Part 2: Machining glass:

[T3sl4co1l]

I don't have photos, kinda obviously, but just something neat.  On my walk tonight, saw a train of rather fast moving dots in the sky.  Looked like a blur at a distance, but was obviously a train of dots once overhead.  Which must've been a new launch of satellites.  Probably Starlink then?

And indeed, there was a Group 4-14 launch earlier today, so there you have it.

The sighting was approx. 8:40-8:50 pm CDT, which gives you a pretty good idea where I was at.

Tim

[RoGeorge]

...
On my walk tonight, saw a train of rather fast moving dots in the sky.
...

...
And indeed, there was a Group 4-14 launch earlier today, so there you have it.
...

This:

EXCLUSIVE: Buzz Aldrin Confirms UFO Sighting in Syfy's 'Aliens on the Moon'

[Ed.Kloonk]

I'm confused. One minute they say that nobody really went to the moon, then the next minute they say there are moon bases all over the other side.

 

[RoGeorge]

The Outer Limits ( 1963-65 ) S01E01 - The Galaxy Being
Monster Horror Mystery Channel



 

[MegaVolt]

I'm confused. One minute they say that nobody really went to the moon, then the next minute they say there are moon bases all over the other side.

 

These are aliens bases. They were built by aliens. And people from the earth did not fly ))))))))))))))))

[RoGeorge]

Moon bases:



 

[RoGeorge]

What does the James Webb Use to See the Universe?
Curious Droid



 

[Ed.Kloonk]

[RoGeorge]

"Morning, Mr. Freeman. Looks like you're running late."

Californium (new) - Periodic Table of Videos
Periodic Videos


 

[RoGeorge]

How to make an Electrostatic Polarity Detector(Electric Field Detector)
Thomas Kim



Schematic is at minute 7:14 
Can be used for this, too:

Lightning Detector Circuit Experiment (Electric Field Detector)