July 2015 ~ Robert Gawron

Measuring nuclear-radiation of potassium from cigarette ashes

in chemistry, radioactivity / with 2 comments /

In the previous post I've presented a simple way of extraction compounds from ashes, today I will measure radioactivity of obtained sample by using my homemade Geiger counter. Below is a quick view of the setup that I used. ...

Extracting potassium (with its radioisotope) from cigarette ashes

in chemistry, radioactivity / with No comments /

Organisms are built mainly of carbon, hydrogen and oxygen, but they use many more chemical elements, one of them is potassium. After burning of organic matter, potassium stays in ashes as oxide that later is transformed to hydroxide. In the environment,...

Breadboard made from scrap electronics

in electronic engineering / with No comments /

A simple but useful breadboard can be made at home, it will be more expensive than those on the markets, but it's possible to add commonly used elements, like LEDs, switches, etc. I hadn't had female sockets, so I cut in half old DIP-18 sockets - it...

USB li-ion battery charger

in electronic engineering / with 8 comments /

Li-ion cells become more and more popular due to their capacity and reasonable prices. In this entry I will show how to build a simple li-ion battery charger based on MCP73831 chip. It's a quite useful device for DYI projects,in addition its cost is...

Yet another way protect pictures against copying

in image processing, programming, Python / with 3 comments /

It's not possible to protect an image against any person, but it can be protected enough for most of the users. There are a couple of ways to do this, most popular are CSS tricks, but today I will present another way. Can you save below image? I bet you can't! ;-) .Image2HTMLTable td, tr{ margin:...