Ordered print-circuit board for frequency meter and received it recently. Here is top.
Category: DIY
Frequency meter
Next step in my current electronics project, after idea and schematics, is prototyping. Here is working prototype assembled on breadboard using lab equipment (like power supply etc). In top-left corner is zero-level cross detector, it converts any periodic signal with amplitude from 1 to 5V into square signal with 0 to 5V amplitude, pretty much digital one.
In bottom right corner Atmel’s ATTiny 2313 that measures frequency of this signal and shows it on display.
How I tear apart HD
Hard drive on on of our client’s server went bad so we replaced it. Being curious, I teared it apart just see what’s inside. This is top view before operation. It needed torques not regular screwdriver.
Frequency meter project
Statement of Problem
Occasionally a field engineer will need to quickly measure the frequency of periodic signals. These signals could be in square, sinusoidal, or triangle form. Certainly there are labs with the proper devices that can measure these signals. However it is costly, not portable, and needs an AC power source. We will design and provide a portable, cheap, handheld device to overcome these problems. Our device will work on battery power and contain a built in function that will permit the device to shift into a power save mode when not in use. This will allow for battery life optimization. Continue reading “Frequency meter project”
FM radio on your mp3 player
One day I was tired listening local radio and my music collection. I was missing Russian FM station that I listened before. I knew most of them broadcast in Internet and I could grab audio stream and create mp3 file and listen it later when I am driving to work. What I needed to do it is to find or create appropriate tools. I already had server running Slackware Linux 13.0 and I knew it already has many tools. I choose mplayer as recording tool and lame as mp3 encoder.
Continue reading “FM radio on your mp3 player”