A banana connector is a single-wire (one conductor) electrical connector used for joining wires to equipment. The term 4 mm connector is also used, especially in Europe,because the pin’s diameter is nominally 4 millimetres (0.16 in).The pin has one or more lengthwise springs that bulge outwards slightly, giving the appearance of a banana.
The original plug consists of a cylindrical metal pin about 20 millimetres (0.79 in) long.However other sizes have emerged, such as 15 millimetres (0.59 in) pins, which can commonly be found in the US. Banana plugs and cables are typically rated for 30 V at 15 A, but there are versins rated up to 30A. Typical applications are test cables on electronics laboratories and speaker connections on HiFi systems.
In most European countries, the standard mains power receptacle will physically accept banana and even US-style “double banana” plugs (the standard US pin spacing of 3/4 inch (19.05 mm) is close enough to the mains plug spacing of about 19 mm, and the pin diameter is also compatible), leading to a risk of electrical shock.
A typical design is now required (IEC 61010) on digital voltmetertest leads and several other measurement and laboratory equipment. In this design, the metal banana plug is entirely sheathed in plastic and presses into a deep recess in the DVM. The sheathed male plug will not work with an unsheathed female socket, but an unsheathed male plug will fit a sheathed female socket.This kind of sheathed banana connectors are typally used up to 1000V voltages.
Last but not least: Screw locking Banana.The UHF connectoris a threaded RF connector design RF connector useable up to 100 MHz (typically used for HF and lower VHF frequencies). Thsi connector has approximately 0.156 inch (4mm) diameter pin and socket for the inner conductor. It is possible to mate UHF connector female with banana plug.
Side-channel attacks that monitor a computer’s electromagnetic output to snaffle passwords are nothing new. They usually require direct access to the target system and a lot of expensive machinery – but no longer.
Researchers at Fox‑IT have managed to wirelessly extract secret AES-256 encryption keys from a distance of one metre (3.3 feet) – using €200 (~US$224) worth of parts obtained from a standard electronics store – just by measuring electromagnetic radiation.
The popular Philips Hue smart lamps use ZigBee for example. Suppose you could build a worm that jumps directly from one lamp to another using their ZigBee wireless connectivity and their physical proximity. If the install base of lamps in a city is sufficiently dense, you could take them all over in no time, with the worm spreading like a physical virus. The authors of today’s paper demonstrate exactly how to build such a worm.
Exclusive A massive trove of Microsoft’s internal Windows operating system builds and chunks of its core source code have leaked online.
Super Mario Bros. is iconic, so it’s a natural target for augmented reality development, where everything nostalgic is new again. This demo, created by Abhishek Singh, really is amazing, however. Singh recreated the first level of Super Mario Bros. as an augmented reality game on Microsoft HoloLens.
A WebSDR is a Software-Defined Radio receiver connected to the internet, allowing many listeners to listen and tune it simultaneously. SDR technology makes it possible that all listeners tune independently, and thus listen to differentsignals; this is in contrast to the many classical receivers that are already available via the internet.
The Server Message Block version 1 (SMBv1) — a 30-year-old file sharing protocol which came to light last month after the devastating WannaCry outbreak — will be removed from the upcoming Windows 10 (1709) Redstone 3 Update.
The WannaCry ransomware wreaked havoc last month. You can find more information on WannaCry at http://www.epanorama.net/newepa/2017/05/12/an-nsa-derived-ransomware-worm-is-shutting-down-computers-worldwide/
Kdump is a way to acquire a crashed Linux kernel dump, but finding documents that explain its usage and internals can be challenging. This article examines the basics of kdump usage and look at the internals of kdump/kexec kernel implementation.
This is the interesting result of the “2017 hacker board survey” by Linuxgizmos.com.
The 2017 Hacker Board Survey is the annual Linuxgizmos reader survey of open-spec, Linux- or Android-ready single board computers priced under $200.
Well-intentioned people keep proposing solutions to open source governance and revenue models. They’re wrong. Here’s why.
According to a new Black Duck survey, developers can’t get enough of open source, ramping up open source adoption by 60% last year. Why the uptick? A whopping 84% cited superior cost savings, ease-of-access, and no vendor lock-in.
Open source has become so pervasive that, as Cloudera co-founder Mike Olson declared: “No dominant platform-level software infrastructure has emerged in the last ten years in closed-source, proprietary form.” That’s “none” as in “zero.” Indeed, open source is such a staple of developer life that, he continued, “You can no longer win with a closed-source platform.”
Sourcegraph, MariaDB, and others that have recently launched hybrid licenses in an attempt to capture the benefits of open source without actually being open source. Good luck with that.
With so much innovation happening in open source projects, why not take advantage of it across your product and supply chain?
Attention span has shrunk alarmingly short. We seem to look for and welcome distractions.
“We are information-seeking creatures”
Just as ancient humans foraged for food, we now forage for information (Maybe we need to include personal communications and entertainment in the general concept of information).
We’re easily bored, and there is the FOMO effect, the great fear of missing out. So we constantly overvalue the perceived return of a new patch.
Tesla coils and other high voltage equipment that make sparks are always entertaining and potentially dangerous. There are some portable tesla coils you can buy online that say, “safe, low current”, and yet they still produce lightning and have a high voltage output.700K Mini Coil Tube Neon Glow Coil With Transparent Plate Power Supply For Tesla is one such device I tested. Here is some story about it.
Let’s start with basics:The Tesla coil is an electrical resonant transformer circuit designed by inventor Nikola Tesla in 1891. It is used to produce high-voltage, low-current, high frequency alternating-current electricity.Ever since Tesla’s 1890s lectures, Tesla coils have been used as attractions in educational exhibits and science fairs. They have become a way to counter the stereotype that science is boring. They are old, but I this they are still cool!
700K Mini Coil Tube Neon Glow Coil With Transparent Plate Power Supply For Tesla page promised following technical specifications:
Color: As the picture shows
Power supply: 220V / 110V AC
About 700k frequency
“arc can be touched by hand”
“Can light of incandescent lamp, energy-saving lamps, integrating scientific demonstration and entertainment, suitable as a magic props used in science and education, science and technology museum and school exhibits, etc.”
1 x Tesla’s Coil
1 x Adaptor
7 x Small accessories
The coil is around 100 mm long. So the device is quite small. The product I recieved looked somewhat different than on the product page picture showed, but the most important details were OK. Here is picture of the coil I received:
The electronics is pretty simple: One power transistor, few passives and the Tesla secondary coil:
The circuit is powered with mains power supply that gives out 9V 1A DC to the electronics:
The Tesla coil driver circuit is based on a version of quite popular Slayer Exciter Circuit. Electroboom article Slayer Exciter Circuit with a Tesla Coil has explanation (circuit diagram, text and video) how the circuit works. Here is circuti diagram from that page:
On my700K Mini Coil Tube Neon Glow Coil With Transparent Plate Power Supply For Tesla it seems that the diode is a LED – and some other slight modifications. The transistor circuit makes the secondary coil to oscillate as long as it gets proper feedback from the secondary coil (through capactance to ground). The circuit keeps oscillating on normal condtions, but in case the secondary gets shorted the or loaded too much., the oscillation stops – a good safety feature: coil turns off if you accidentally touch it (also protects electronics against overload).
Some maybe interesting measured data: The Tesla coil secondary on this unit I have has resistance fo aroun 55 ohms and inductance of around 370 microhenry. I would have wanted to measure the current consumption of he Tesla coil on use, but the cheap multimeter I tried to use for that failed to work properly near the Tesla coil (maybe it did not like the high electric field and/or high frequency pulsating current).
Here is the device prepared to make sparks. I added the yeallow wire to the device. It is connected to the output coil end that is connected to transistor base. I use that wire to make nice sparks.
The original documentation talks about 700 kHz operating frequency (if I undersand that 700k frequency right). The real frequency seems to be something quite different according to my oscilloscope: around 3.5 MHz. This was measured with normal oscilloscope probe aroudn 30 cm away from the coil on the table (I did not want to put it near the high voltage source that can damage my oscilloscope).
Many Tesla coils have some capacitive load on the top. Here is my attempt to add some capacitance on the top: piece of plastic wapped on aluminium foil. It chamges frequency.
The Tesla coil can in this configuration light up the supplied neon bulbs from some distance nicely. It can also make sparks (quite small compared to bigger Tesla coils). Neon indicator lamps are normally orange, but this package also had special green version also included.
700K Mini Coil Tube Neon Glow Coil With Transparent Plate Power Supply For Tesla is cheap ($10) and quite funny high voltage device to play with. It might not be the most useful tool on electronics lab and does not make huge sparks (I woudl have wanted mych biggr sparks!), but it is still fun. Look at the following web pages for ideas what kind of experiments can be done with Tesla coils (some experiments ask for much bigger coil):
NOTE: Besides high voltage electrical field generation Tesla coil can be a big source of radio frequency interference. Keep the Tesla coil away from any sensitive electronics devices!
A very serious security problem has been found in the Linux kernel called “The Stack Clash.”
The Qualys Research Labs discovered various problems in the dynamic linker of the GNU C Library (CVE-2017-1000366) which allow local privilege escalation by clashing the stack including Linux kernel. This bug affects Linux, OpenBSD, NetBSD, FreeBSD and Solaris, on i386 and amd64. It can be exploited by attackers to corrupt memory and execute arbitrary code.
An attacker could leverage this with another vulnerability to execute arbitrary code and gain administrative/root account privileges.
Microsoft is building an online Raspberry Pi simulator that allows Makers to write code to control hardware… even without owning a board.
Codeanywhere, a cross platform cloud IDE for creating web apps and sites has acquired Codebender, another cloud IDE that enables users to develop for Arduino devices.
Codebender and its additional services edu.cobebender.cc and blocks.cobebender.cc will continue to operate and be supported by Codeanywhere.
This is quite interesting -or frightening – WiFi radar application.
A new system by University of California, Santa Barbara researchers Yasamin Mostofi and Chitra R. Karanam uses two drones, a massive Wi-Fi antenna, and a little interpolation to literally see through solid walls.
One drone blasts Wi-Fi through the structure and another picks up the signal. The two drones fly around the solid structure to map the differences in wave strength at different points. Using this information the researchers have been able to create a 3D model of a closed building.
Ever since the Google I/O keynote, developers have been wondering whether they should stick to Java or start focusing on Kotlin, which is now an official programming language for the development of Android applications.
The truth is that as opposed to Java, the resources for learning Kotlin are scarce.
Java vs. Kotlin shouldn’t even be a question to you considering you are already an advanced developer. Seriously, you are in a stage where both Java and Kotlin are BOTH at your disposal.
Similarly to Swift, you can bet on it that Kotlin will become increasingly important over time as well.
Kotlin has a more concise syntax than Java.
Gartner has published a new magic quadrant for infrastructure-as-a-service (IaaS) – the results should not be surprising to anybody. Consider this posting as update to my previous cloud market posting few years back. Here is reporting on newest cloud market trends from two sources:
Gartner puts AWS, Microsoft Azure top of its Magic Quadrant for IaaS | ZDNet
Amazon Web Services (AWS) and Microsoft Azure dominate the infrastructure-as-a-service field, according to Gartner, which released its IaaS Magic Quadrant.
However, Google Cloud is emerging as a key challenger.
Paranormal parallelogram for IaaS has Google on the same lap, IBM and Oracle trailing