As you all know Ruby is one of the most popular programming language on the web. It is recommended to install ruby 1.9.2 instead of 1.8.x I tried to install ruby from the package manager on Ubuntu, but ruby 1.9.2 is not there in the repo. So, I am going to show you how to install ruby 1.9.2 on Ubuntu Step 1 – Fire up the terminal and execute these few commands – Step 2 [...]

An oscilloscope is an instrument that can be used to analyse waveforms or output from circuits. A cheap oscilloscope can be made using a PC and mic. However it is limited to low frequencies at around 25Khz (the audible range). Things needed : 1. A PC with a sound card 2. A mic wire (TRS plug) 3. A sound application – Audacity Simple plug the mic into the mic socket of the sound card. Remove [...]