Abonnér på EEVblog feed EEVblog
No Script, No Fear, All Opinion
Opdateret: 29 minutter 49 sekunder siden

EEVBlog #1131 – £1M Prank – Banksy Artwork Shredded! HOW?

ons, 17/10/2018 - 08:06

A look at how the Banksy artwork prank “Girl with a Balloon” shredded itself moments after being sold for £1M at a Sotheby’s auction.
How long did it sit idle waiting to be triggered?, and was this actually possible?
NOTE: The Artwork was authenticated by “Pest Control”, which is Banksy’s own authentication house. If the artwork was delivered to them for checking before the auction, this is when they installed the mechanism. I still think the at least the seller has to be in on it, and likely the buyer (otherwise they could sue Banksy and bring his real name into the public). And if Sotheby’s were in on it (they’d lose their reputation if they were) they look like fools. Lose–lose for Sotheby’s.

Forum HERE

EEVblog #1130 – Mailbag Monday

ons, 17/10/2018 - 08:02

More Mailbag Monday

Forum HERE

SPOILERS:
A-TEK AT-601 PC ISA Bus Design Breadboarding Tool
Gigatron TTL computer update

Home


VintageTek museum XY demo board
https://www.ebay.com/str/vintagetek
1970’s Casio CQ-1 Calculator
Zofz PCB Gerber Viewer
https://www.zofzpcb.com/

EEVblog #1129 – Creating a Nice Readable Schematic

ons, 17/10/2018 - 08:00

How to turn a horrible unorganised schematic into a nice readable modular schematic with proper signal flow.
Tips on industry standard and expected layout techniques.

Using the open source Haasoscope oscilloscope as an example.

Please do NOT complain about the length of this video. I know. It is what it is.

9:28 LED configuration
12:28 Single Page Vs Multi page schematics
14:24 Net lines and bus lines
25:25 Connection stuff
36:32 Consistent component symbols
37:29 Signal flow from left to right (schematic reorganisation part 1)
44:15 The great nF debate
46:18 Text designation (Part II)
47:57 Net line Vs Port (for blocks)
49:43 Description on blocks
50:02 Signal f low from left to right (schematic reorganisation part 2)
1:08:38 Don’t put junctions on line cross-overs (Don’t cross the streams)

Forum HERE

EEVblog #1127 – Studio Monitor Speaker Noise – Part 2

fre, 05/10/2018 - 08:22

Follow-up to the Studio Monitor Noise video, replacing the mains power supply with a battery supply. Does the noise floor go away?

Forum HERE

EEVblog #1127 – Mailbag Monday

tir, 02/10/2018 - 02:50

Yes, Mailbag Monday is back!
Weekly mailbag videos to come.
Perhaps the worst schematic ever seen?

SPOILERS:
Only two items for today’s Mailbag, and I had a lot to say on each.
The WIHA SpeedE Electric Screwdriver

16:10 Will the HaasoScope 4CH 60MHz 200MS/s change Dave’s mind on USB oscilloscopes:
https://www.crowdsupply.com/andy-haas/haasoscope
https://github.com/drandyhaas/Haasoscope/

Forum HERE

EEVblog #1126 – Mystery Teardown!

fre, 28/09/2018 - 01:32

What’s is this obscure 1970’s bit of kit from a big name manufacturer?

AliExpress Affiliate

Forum HERE

EEVblog #1125 – Amazing $500 Soldering/Inspection Microscope!

fre, 28/09/2018 - 01:30

This sub US$500 Eakins microscope from Aliexpress seems identical to the new AU$1800 Suba Engineering microscope for 1/3 the cost.
And Dave shows how it can out perform the $4500 Tagarno!

http://s.click.aliexpress.com/e/b7ycSav2
http://s.click.aliexpress.com/e/eN3Ec5a
http://s.click.aliexpress.com/e/bHSXalzm
http://s.click.aliexpress.com/e/cMimkzYc

Forum HERE

EEVblog #1124 – Rigol 7000 Oscilloscope Teardown

man, 24/09/2018 - 08:06

Inside the new Rigol 7000 Series oscilloscope with custom ASIC’s.
Also a look at the bootloader code for potential hacks.

Forum HERE

Hi-res photos:

Rigol MSO7000 Oscilloscope Teardown

EEVblog #1123 – EEVblog Meetup 2 Electric Boogaloo

tor, 20/09/2018 - 02:54

A look at the recent EEVblog meetup and the projects people bought along to show off. And you won’t believe which companies advertised at the event!

EEVblog #1122 – Raspberry Pi 3 PoE Hat FAIL Investigation

tor, 20/09/2018 - 02:51

The new official Power Over Ethernet (PoE) hat for the Raspberry Pi 3 B+ has been reported to fail with an overcurrent error when powering USB devices.
Dave investigates and narrows it down until, well, something goes horribly wrong…

Rpi forum

Forum HERE

WTF Youtube – Not Suggesting Fran Blanche?

tir, 18/09/2018 - 02:03

Youtube isn’t suggesting Fran Blanche’s channel any more, what’s going on?
Does Youtube not suggest de-monetised content?

EEVblog #1121 – Fontus goes BANKRUPT!

tor, 13/09/2018 - 05:31

Who saw it coming?, Fontus have filed for bankruptcy!
The infamous “self-filling water bottle” that raised $340k on Indiegogo has gone bankrupt and delivered nothing.
You ‘canna beat the laws of physics Captain!

https://www.ksv.at/insolvenzfaelle/insolvenz-fontus-water-technology-gmbh-1030-wien
http://www.fontus.at/fontus-update.pdf
https://www.indiegogo.com/projects/fontus-the-self-filling-water-bottles#/

Forum HERE

EEVblog #1120 – How To Understand Polarised Light

tor, 13/09/2018 - 05:29

Gav “The Mechatronics Guy” explains circular polarised light and demonstrates his physical laser cut models to help understand this concept in his quest to make a pixel mapped polarised light camera.
How do 3D shutter glasses work?

https://tinkerings.org/

EEVBlog #1119 – Designing a 1kV Isolated Oscilloscope

fre, 07/09/2018 - 02:02

Bart Schroder from Cleverscope talks about the challenges in designing the world’s highest performance isolated oscilloscope.

Measurement demo on a 500V MOSFET H-Bridge and how to accurately probe it. Then a teardown and walk through of the design of the new CS448 1kV 4CH 200MHz 14bit isolated oscilloscope and the custom probes, power supplies and optical fibre interfaces they had to design to get this performance.

Forum HERE

EEVblog #1118 – Why Are Studio Monitors Noisy?

ons, 05/09/2018 - 02:54

Why do many powered studio monitor speakers have a low level audible background noise?
This is an issue with many big and popular brand monitors like KRK, Yamaha, JBL, Alesis and many others
Time for some investigation on the KRK Rokit 6 studio monitor speakers to track down where the noise is coming from.

NOTE: Not all monitors have this issue, many much higher end ones may not. It pays to check this first if you are going to spend decent money on studio monitors, as you may find it annoying.

EEVblog #1117 – PCB Power Plane Capacitance

man, 03/09/2018 - 07:20

Are power planes in a 4 layer PCB any good as a capacitor?
Can it work as one big bypass capacitor?
A look at an discussion on PCB layer stackups, and some measurements on 4 and 8 layer PCB power planes with different prepreg thicknesses and how well they work as a capacitor.

https://www.xilinx.com/support/documentation/application_notes/xapp623.pdf
https://www.researchgate.net/publication/242415439_High_Performance_FPGA_Bypass_Networks

Forum HERE

EEVBlog #1116 – The Capacitance Multiplier

tir, 28/08/2018 - 01:19

Circuit building block time. The capacitance multiplier and how it gives almost negligible power supply ripple compared to a voltage regulator.
Whiteboard theory and then some bench demonstrations and experiments. Plus a twist at the end that proves that the “Capacitance multiplier” is perhaps one of the most mis-named circuits of all time.

Forum HERE