How to build a simple laser tachometer

Did you know you can use an LED as a light sensor? In this video I show you how to use this phenomenon to build a laser tachometer capable of measuring the RPM of mechanical devices.

How to build a simple laser tachometer – [Link]

Kristall 511 solder wire won´t dirt your PCB

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Innovative flux and a high qualty alloy provide to Stannol Kristall 511 solder wire excellent processing properties with a minimum of clean transprarent residues.

You, who are at production of electronic devices, know, how important is a choice of a suitable solder. A designer of a given device might not focus on a solder used at soldering of the first protoype, bu tin a production it will manifest itself – sooner or later. Not that some solder would be miraculous and otherone unusable, but each one is suitable for something else.Similarly lie in other segments, even here are some exceptions, when by using the newest materials and know-how from development of solders exist types suitable for multiple applications. One of them is solder Kristall511 Ecoloy with an innovative flux based on synthetic resins. The result is a small spatter and clean, transparent residues, which don´t influence electrical properties of a PCB, i.e. they belong to a “No clean” category – they can stay on a PCB withot cleaning. Kristall 511 is a considerably active solder and it shows its strength even at surfaces with not that optimal solderability and also there, where it´s necessary to solder quickly (for example components that are exceptionally sensitive to temperature). KRISTALL 511 was developed for automated soldering of SMT components, as well as for hand soldering and rework.

This way Stannol, as a producer with rich experience in development of solders (from 1920), produced a combinatio of an alloy+flux with properties meeting majority of requirements of production:

  • small amount of transparent residues
  • excellent spreading even at poorly solderable sorfaces (copper, brass, nickel,…)
  • highly active
  • electrically safe residues
  • low spitting
  • mild odour and small amount of fumes

On stock we have two novelties KRISTALL 511 Sn95,5Ag3,8Cu0,7 (593132) (diameter 1mm, 500g) and KRISTALL 511 Sn96,5Ag3,0Cu0,5 (810050) (diameter 1mm, 500g) solder wires. Technical details can be found in the Kristall_511 datasheet.


Kristall 511 solder wire won’t dirt your PCB – [Link]

DIY Digital Compass

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by DaAwesomeP @ instructables.com:

I’m astounded that some cars don’t have a digital compass always visible. You either have to launch the navigation app each time which may even disappear when you adjust the radio. In this project, you’ll create a digital compass that can be powered by by the cigarette lighter or another source (batteries make it handheld). You could buy one, but where’s the fun in that?

DIY Digital Compass – [Link]

Buck-boost regulator achieves high efficiency

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by Susan Nordyk @ edn.com:

Using adaptive current-limit PFM (pulse frequency modulation) control, the ISL9120 switching regulator from Intersil realizes efficiencies of up to 98%, while automatically transitioning between buck and boost modes without significant output disturbance. The part accommodates a wide input voltage range of 1.8 V to 5.5 V and has an adjustable output voltage range of 1 V to 5.2 V for use with multiple power rails. It is capable of delivering up to 800 mA of output current (VIN = 2.5 V, VOUT = 3.3 V).

Buck-boost regulator achieves high efficiency – [Link]

Running Intel x86 apps on Raspberry Pi 1 and 2

ExaGear Desktop is virtualization solution which opens up a host of new possibilities for running apps across platforms. ExaGear Desktop makes it possible to run Intel x86 application on ARM-based devices, and is targeted to individuals running ARM-based Mini PCs and to businesses deploying ARM-based devices to cut costs. For example you can run Skype on ARM devices (youtube; https://youtu.be/4GUP27TJ5w4). Moreover you can run x86 Windows applications on ARM-based devices by installing Wine.

ExaGear Desktop also boasts outstanding performance specs – in tests it runs 5 times faster than Qemu.

Running Intel x86 apps on Raspberry Pi 1 and 2  – [Link]

Fully reprogrammable optical chip developed

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by Graham Pitcher @ newelectronics.co.uk:

Researchers from the University of Bristol and NTT in Japan have developed an optical chip that can process photons in an infinite number of ways. According to the team, the fully reprogrammable chip marks a ‘new era of research’ for scientists and engineers at the cutting edge of quantum technologies. Dr Anthony Laing, who led the project, said: “A whole field of research has essentially been put onto a single optical chip that is easily controlled. The implications of the work go beyond the huge resource savings. Now anybody can run their own experiments with photons, much like they operate any other piece of software on a computer. They no longer need to convince a physicist to … painstakingly build and conduct a new experiment.”

Fully reprogrammable optical chip developed – [Link]

Arduino playing the melody with the Sd card

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by sezgingul @ instructables.com:

This project is in SD card loaded stolen melody is provided by command sent from the serial monitor.
If you want to add the application var.siz 6-melody melody melody file must be the same as the name of the specified code name.

The components are used:

Arduino UNO, SD card reader, speakerphone

Arduino playing the melody with the Sd card – [Link]

Arduino Radar Tutorial: Fading an LED With My Breath

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by build-electronic-circuits.com:

I built this Arduino radar project, where I control the brightness of an LED with my breath. In this tutorial, I will show you exactly how to do it.

It was an experiment to get the XeThru radar to work with Arduino. I plan to expand on this later, and build more useful applications.

And I will share with you how to connect the hardware, and how to create the Arduino code.

Arduino Radar Tutorial: Fading an LED With My Breath – [Link]

RELATED POSTS

Geiger counter with SBM20 tube

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by weirdlab.fr:

I “rebuild” my Geiger counter, the SBM-20 tube was initially inside the box, i have put this one inside a 32mm diam plastic tube, for more convenience, wired through a XLR3 cable. This counter is from “Electronique-Pratique” n°368, a french electronic magazine. Shem, pcb, and PIC hex & C source code available.

Geiger counter with SBM20 tube – [Link]