Author Topic: Fun for nerds (Read 336060 times)

BrianHG · « **Reply #950 on:** July 16, 2026, 12:55:40 am »

Don't ask, just seek to 18:30...

RoGeorge · « **Reply #951 on:** July 17, 2026, 01:48:39 pm »

The Most Viral Science Videos Ever
Daily Dose Of Internet

RoGeorge · « **Reply #952 on:** July 21, 2026, 06:10:13 pm »

NASA's $40 BILLION Plan To Image Alien Worlds
AstroKobi

SiliconWizard · « **Reply #953 on:** July 21, 2026, 11:03:36 pm »

The "mechanical" light bulb is pretty cool.

BrianHG · « **Reply #954 on:** July 21, 2026, 11:25:58 pm »

Quote from: SiliconWizard on July 21, 2026, 11:03:36 pm

The "mechanical" light bulb is pretty cool.

Even when he is not shaking it, it just illuminates way too easily.

RoGeorge · « **Reply #955 on:** July 24, 2026, 06:41:15 am »

#413: Cascading Common-Emitter Amplifiers using an Emitter Follower
w2aew

RoGeorge · « **Reply #956 on:** July 25, 2026, 09:00:32 pm »

Red Hot Technology! - Vacuum Tubes Explained
AWA Communication Technologies Museum

BrianHG · « **Reply #957 on:** July 26, 2026, 12:17:27 am »

The Fascinating Story of LeCroy, The Particle Physicist Who Took On Tektronix With Digital Scopes

BrianHG · « **Reply #958 on:** July 30, 2026, 05:17:40 am »

NO WAY!!!

SteveThackery · « **Reply #959 on:** July 30, 2026, 08:28:56 am »

Fascinating!

BrianHG · « **Reply #960 on:** July 30, 2026, 09:16:30 am »

Quote from: SteveThackery on July 30, 2026, 08:28:56 am

Fascinating!

I guess the 'plucked' strings are behaving exactly like sending a pulse beginning somewhere along the line down a huge transmission line without all the surrounding noise. Very counterintuitive.

SteveThackery · « **Reply #961 on:** July 30, 2026, 12:17:56 pm »

Quote from: BrianHG on July 30, 2026, 09:16:30 am

I guess the 'plucked' strings are behaving exactly like sending a pulse beginning somewhere along the line down a huge transmission line without all the surrounding noise. Very counterintuitive.

I certainly hadn't expected that to happen when the string is plucked in the middle. Obviously that's why it still sounds like a guitar and not a sine wave.

RoGeorge · « **Reply #962 on:** July 30, 2026, 08:07:46 pm »

Where Does Light ACTUALLY Come From?
Physics Explained

RoGeorge · « **Reply #963 on:** July 31, 2026, 05:47:04 pm »

The STRONGEST Laser you've never heard of!
Les' Lab

MathWizard · « **Reply #964 on:** August 03, 2026, 12:08:33 pm »

I don't see a 'what did you learn today' thread so I must share my excitement here of learning more about State Space modelling of circuits.

State Variable Models
https://www.site.uottawa.ca/~rhabash/ELG4152L305.pdf

State Space Approach to Solving RLC circuits
https://web.mit.edu/16.unified/www/FALL/signalssystems/Lecture13.pdf

BrianHG · « **Reply #965 on:** August 03, 2026, 08:31:39 pm »

Everything AI Does When You Ask It to Start a Lemonade Stand

This guys spent a few thousand on 2 lemonade stands....

RoGeorge · « **Reply #966 on:** August 04, 2026, 05:27:47 pm »

Coherer detector of electromagnetic signal
Experiments Robert33

BrianHG · « **Reply #967 on:** August 10, 2026, 01:42:07 am »

Silicon that repairs itself. (Redundant cells. First laser blown fuses, then self blowing fuses.)

SteveThackery · « **Reply #968 on:** August 10, 2026, 07:31:11 am »

Quote from: RoGeorge on August 04, 2026, 05:27:47 pm

Coherer detector of electromagnetic signal
Experiments Robert33

Weird - that fan appears to start before the click from the lighter. So that implies it responds to an electric field. Does that seem right? I don't know anything much about coherers.

BrianHG · « **Reply #969 on:** August 10, 2026, 02:09:22 pm »

Quote from: SteveThackery on August 10, 2026, 07:31:11 am

Quote from: RoGeorge on August 04, 2026, 05:27:47 pm
Coherer detector of electromagnetic signal
Experiments Robert33

Weird - that fan appears to start before the click from the lighter. So that implies it responds to an electric field. Does that seem right? I don't know anything much about coherers.

The effect is real. Its a primitive radio receiver. It has nothing to do with the flame, its the striking of the crystal creating the electric spark before the flame begins.
(The click sound delay may just be a lip-sync timing issue with the presenter's AV equipment...)

See here:

SteveThackery · « **Reply #970 on:** August 10, 2026, 02:39:45 pm »

Quote from: BrianHG on August 10, 2026, 02:09:22 pm

The effect is real. Its a primitive radio receiver. It has nothing to do with the flame, its the striking of the crystal creating the electric spark before the flame begins.
(The click sound delay may just be a lip-sync timing issue with the presenter's AV equipment...)

Yes, of course - I never said anything about the flame. But look again: it still appears to switch on the fan before the crystal is tapped. You can observe the delay in the sound when he taps the coherer. The fan definitely starts before the click (including the delay).

PS: I'm not going to waste 12 minutes of my life on that second video. I know the effect is real. I didn’t say or imply it wasn't. I said the fan starts before the lighter clicks, so is the coherer sensitive to the electric field as the crystal is slowly compressed?

BrianHG · « **Reply #971 on:** August 12, 2026, 01:34:07 pm »

The complex brilliant way how OpenAI's agent broke out of its closed box to hack huggingface...
(i.e. We are all destined to be screwed...)

RoGeorge · « **Reply #972 on:** August 14, 2026, 07:04:54 pm »

Tim Maudlin: A Masterclass on Special Relativity
Robinson Erhardt

Tim Maudlin: A Masterclass on General Relativity
Robinson Erhardt

BrianHG · « **Reply #973 on:** August 15, 2026, 07:56:07 pm »

For those who like old elevator controller rooms, synced shots and how the relay and speed control logic worked...

RoGeorge · « **Reply #974 on:** August 17, 2026, 05:25:00 am »

A 1963 computer in plastic and rubber bands: The Digi-Comp 1
Chris Staecker


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Author Topic: Fun for nerds (Read 336060 times)

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