Engineering Porn

Pink Floyd pioneered live surround sound as long ago as the early ’70s. Chris Hewitt has tracked down the groundbreaking PA systems they used at Pompeii and on the Dark Side Of The Moon tour, and rebuilt the custom quad console operated by Alan Parsons. In our exclusive video feature, Chris explains how the Floyd created a fully immersive concert experience more than 50 years ago.

Chapters 00:00 - Introduction 01:14 - Allen & Heath quadraphonic desk 01:39 - Desk designer Andy Bereza 02:00 - Allen & Heath Minimix 02:19 - Pink Floyd mixing in quad 02:43 - Teac A3340 4-track tape machine 03:22 - Alan Parsons at the mixing desk 04:11 - Binson Echorec 2 04:30 - Live mix engineers 05:30 - Introduction of wedge monitors 06:26 - Sennheiser MD 409 07:07 - Phase Linear amplifiers 08:54 - WEM parabolic dish 11:23 - Rebuilding the quad desk

Thank you to Chris Hewitt of CH Vintage Audio for inviting us to film his collection. https://www.chvintageaudio.com

The following books by Chris Hewitt contain a wealth of information and further details about the Pink Floyd PA system as well as the history of WEM the pioneering British live sound company.

The Development Of Large Rock Sound Systems: Volume 1 The Development Of Large Rock Sound Systems: Volume 2 The Development Of Large Rock Sound Systems: Volume 3

cross-posted from: https://lemm.ee/post/4411464

A very quick overview of nearly every machine you'll see on a construction site.

It takes a lot of big tools to build the roads, dams, sewage lift stations, and every other part of the constructed environment. To me, there’s almost nothing more fun than watching something get built, and that’s made all the better when you know what all those machines do.

• https://piped.video/watch?v=6CmX4ZmhwPM
• https://www.youtube.com/watch?v=6CmX4ZmhwPM

The video admits in the end that the title is clickbait ("Every"). There are too many to be exhaustive.

In this episode Shahriar takes a look at one of the most advanced electrical test and measurement instruments ever created. The Keysight UXR-Series Real-Time Oscilloscope brings 110GHz of analog bandwidth and 256GS/s real-time sampling at 4-channels simultaneously. To make it even more impressive, the entire data-conversion architecture is in 10-bits. This implies that the instruments captures, processes, stores and displays over 10Tb/s of information.

Various architectures of state-of-the art oscilloscopes from Keysight, LeCroy and Tektronix are examined and compared against the new real-time architecture of the UXR-Series oscilloscope. The teardown of the front-end 110GHz module along with the data acquisition board is presented and analyzed in detail. The instrument showcases a wide range of Keysight technologies implemented in various technologies such as InP, SiGe BiCMOS, 65nm CMOS and 28nm CMOS nodes. In combination with Hyper-Cube memory module, data can be captured at 256GS/S from all 4-channels at the same time. Several variants of the UXR-Series oscilloscope will be available from 13GHz to 110GHz bandwidths.

A new calibration probe is also introduced based on the Keysight InP process capable of producing signal edges with sub-3.5ps of rise/fall times with NIST traceable calibration data. This enables users to perform NIST alignment and bandwidth calibration on site without needing to send the instrument back to Keysight.

Several measurements with the scope demonstrates its extraordinarily low noise floor, jitter as well as the capability of the new probe module for instrument calibration. The 110GHz 4-channel variant of the UXR-Series oscilloscope has an MSRP of $1.3 Million US dollars.

0:00 Intro 1:50 Past examples 3:00 How this works 9:55 sponsor 10:47 Where we’re at 14:00 growing neurons 20:00 results 23:30 Next time

This is one of the more mind-blowing DIY projects I have seen. The quality of workmanship is absolutely next-level. Even though everything is in German, the video is pretty clear.

Airbus Helicopters H160 landing at Paris during Bastille Day. French Astronaut Sophie Adenot at the control

Airbus Helicopters H160 à l'atterrissage sur l'Esplanade des Invalides à Paris, avec aux commandes Sophie Adenot (nouvelle astronaute)

Crew: 1/2 / Capacity: 12 Length: 13.96[24] m (45 ft 10 in) / Width: 3.54[24] m (11 ft 7 in) / Height: 4.91[24] m (16 ft 1 in) Empty weight: 4,050 kg (8,929 lb) / Max takeoff weight: 6,050 kg (13,338 lb) Useful load: up to 2,000 kg (4,409 lb) / Fuel capacity: 1,120 kg (2,469 lb) Powerplant: 2 × Safran Arrano 1A turboshaft engines, 955 kW (1,280 shp) each Main rotor diameter: 13.40 m (43.96 ft) Cruise speed: 255 km/h (158 mph, 138 kn) Range: 880 km (550 mi, 475 nmi) Service ceiling: 6,096 m (20,000 ft) , 9,300 ft (2,835 m) hover ceiling IGE

Love its very distinctive sound. It features two turboprop engines mounted in pusher configuration. It is the fastest civil turboprop.