An easy way to remove a stuck filter from a lens. All you need is a piece of flexible PVC insulated wire.
A timelapse video of the Geothermal power plant in Yanaizu-Nishiyama, Fukushima . Daylight time in 4 minutes.
A simple way to give to an image an old photo look using actions in Photoshop
Create a proper selection using a pen tool in Photoshop
A CW High voltage supply that produces up to 140000 volts (140KV) . Simple, clean design, without oil, but with high quality multipliers.
Build a disc shaped flyback secondary. A robust new design, that will do a great job in your High Voltage projects.
An article presenting a simple DIY Geiger Muller counter using the Russian tube SI-22G and a single transistor regulated inverter that puts out 400V, as required by the tube. A very basic detector assembled in 5 minutes. See an operation comparison to the Radex RD1706.
The standard functionality on Android devices makes the software keyboard popup every time the Menu is long pressed. This may be annoying or unwanted. Here’s how to disable it.
Design custom shaped corners Edittexts or TextViews, or any other kind of Android interface controls, using 9 patch images that keep their aspect when stretched.
The Android Contacts tutorial part 5, here I show a robust solution for selecting a contact from a list. A filter/search mechanism is also implemented using the SimpleCursorAdapter.
Part 4 of Android Contacts tutorial presents an easy way to programatically search and retrieve a contact and all the fields we are interested in such as Phone, Email, Web, Company, Address, etc.
In Android Contacts tutorial part 3, I present a simple way of opening a contact in the System contact form using the ACTION_EDIT Intent .
Part 2 of the Android Contacts tutorial, showing how to add a custom column to a contact, and how to use that to identify a newly added contact and read its LOOKUPKEY.
Part 1 of a tutorial on working with Android Contacts: add a new contact programatically, including name, email, company, phone but also a thumbnail contact image .
A simple way to fix the wash out photos from airplane using Photoshop.
Create an Android GUI with Header, middle scrollable content, and a footer.
An article on Thyratrons and a film showing three energized tubes : the 714, the 309/FG17 and the ELC1B.
A Royer oscillator with 2 IRF540 N-Channel mosfets, a 0.47uF Capacitor and a 1500uH inductor used for an induction heater. The mosfets remain cool, even with such small heatsinks.
Learn how to Invoke the Android Gallery Intent to pick a photo and get the path in your application. This photo picker returns the image path directly in your application.
Create a dynamic (no XML) listview with header with all the bells and whistles. Learn how to use the item position to change its background and content for a complex result.
Learn to read an unique device ID from your Android phone or tablet. Use the ID to generate software security keys or for cryptography applications.
Get started with Android Java development – a tutorial with detailed steps and lots of pictures to help you make your first android application. Use Eclipse and the Android SDK.
My first attempt in building an inertial electrostatic confinement device . It didn’t work.
Learn how to create a Custom TextView class that can draw vertical text or rotate the text to any given angle. Easy!
An Atmega8 multimeter that can measure Transistors: Bipolar/Mosfet , Diodes and Double Diodes , Resistors, Capacitors: between 0.2nF to 7300μF, Triacs and Thyristors.
Build a Ion Thruster using light materials and power it using a 50KV supply to see another kind of propulsion.
Using a high voltage 1GOhm resistor to built a DIY high voltage probe, to measure voltages up to 55KV with a normal multimeter, by scaling the voltage down by 1/1000.
Get X-ray intensifying/fluorescent screens from X-ray cassettes used for radiography.
A scintillation probe enclosing the regulated high voltage supply, the signal amplifier, the photomultiplier and the scintillation crystal (NaI). Building a DIY counter for a NaI Scintillation probe. AtMega8 and a bluetooth module for wireless data output. A cheap and easy to build homemade dosimeter with applications in spectroscopy.