Homemade Flyback secondary -3-
Build a disc shaped flyback secondary. A robust new design, that will do a great job in your High Voltage projects.
Author: Radu Motisan
DIY/Homemade Geiger Muller Clicker V1
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.
Android overriding Menu key to disable keyboard popup
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.
Android 9 Patch images for custom controls
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.
Android Contacts – a simple Contact Selector
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.
Android Contacts – Searching for contacts
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.
Android Contacts – Invoke the Edit Contact Intent
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 .
Android Contacts – Custom Contact column to get the LOOKUPKEY
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.
Android Contacts – Add a new Contact using ContentProvider
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 .
Android WebBrowser using WebView
A few easy steps for an Internet Web Browser for Android. Learn how to use a Webview, load pages, inject Javascript, read the HTML source code and more.
Android GUI with Header+Scrollable Content+Footer
Create an Android GUI with Header, middle scrollable content, and a footer.
Thyratrons
An article on Thyratrons and a film showing three energized tubes : the 714, the 309/FG17 and the ELC1B.
Simple DIY Induction heater
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.
Android PhotoPicker using Intents and Gallery
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.
Android Custom Complex Listview with Header (no XML)
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.
Android Unique Device ID
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.
Developing for Android – the SDK – update 2011
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.
A Farnsworth–Hirsch Fusor failed attempt
My first attempt in building an inertial electrostatic confinement device . It didn’t work.
Android Vertical TextView / Custom Angle Text
Learn how to create a Custom TextView class that can draw vertical text or rotate the text to any given angle. Easy!
Multitester using ATMega8 and HD44780 LCD
An Atmega8 multimeter that can measure Transistors: Bipolar/Mosfet , Diodes and Double Diodes , Resistors, Capacitors: between 0.2nF to 7300μF, Triacs and Thyristors.
Ion thruster using 50KV Supply
Build a Ion Thruster using light materials and power it using a 50KV supply to see another kind of propulsion.
Homemade/DIY High voltage probe
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.
X-ray intensifying screen
Get X-ray intensifying/fluorescent screens from X-ray cassettes used for radiography.
NaI Scintillation Probe and Gamma Spectroscopy
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.
High Current Inverter using ZVS
Use a ZVS Driver as an invertor for a high current supply.
Marx Generator 200KV discharge – artificial lightning
See a 200.000 Marx generator in action. 20cm discharges!
Android on HD2 (HTC Leo) INSTALL_FAILED_INSUFFICIENT_STORAGE
You can boot an Android image, from the SDCard of an Windows Mobile HTC HD2 Pocket PC, using Haret. Be careful to use a 2GB max SDCard!
High Voltage Power supply – 50KV
My homemade high voltage power supply that can provide aprox. 50KV for 12V in.
Android NDK Cygwin make error 127
Android NDK Cygwin make error 127, but only on some computers. I suspect there’s a conflict with other development tools (based on PATH, etc).