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Author Archives: esalazar
Element 14 XL_Star Review
Last week I received an Element 14 XL_Star board from Farnell/Newark. My condition for receiving this board was that I do a review. I must admit that I have been on a quest for the perfect controller board for a … Continue reading
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Experiments With Audio Vacuum Tubes
Previously I tested a El84 using series of 9 volt batteries to generate the high B+ voltages. While it was very simple by nature, it still fell short of the desired voltages that are required to make a useful audio amplifier. Normally … Continue reading
Posted in Eletronics
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Home made 555 timer from NPN and PNP transistors
Before the 555 contest was announced I was reading the free online book 50 555 Circuits from talking electronics. I was very amazed with how much could be done with the 555 timer. So I decided the best way to understand the 555 would … Continue reading
Posted in Eletronics
3 Comments
Testing an El84 Vacuum Tube with 9v Batteries
I have always been interested in vacuum tube amplifiers, however the high voltages from the mains has always kept me from experimenting with them. About a year ago I played with an low power tube the 1t4 in a regenerative receiver. The B+ was set to 45V powered … Continue reading
Posted in Eletronics
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Laser Modem with an Arduino Microcontroller
This started when I ordered an IR led and phototransistor pair from Spark Fun along with some spare ATMega168 microcontrollers. I first experimented using the IR led to transmit 2400 baud serial to the phototransistor. I programmed my Arduino Diecimila … Continue reading
Posted in Eletronics
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Fractal Mountain Generation with Qt and OpenGL
The purpose of this project is to create 3d mountain terrain using a recursive midpoint displacement formula. For this project I decided a GUI would be useful, that way manipulations could be seen in real time.
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Encoding an image to sound
The purpose of this project is to encode an image to a sound that can be viewed with a spectrogram. For some time I have known that musical artists have encoded pictures into their music. Most notable of these is … Continue reading
Posted in Linux, Programming
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Class Serialization in Perl
Serialization in Perl is the process of saving a class with multiple data types to a scalar (string of bytes). This can be used to save objects to a file or to transmit objects across the Internet. For this article … Continue reading
Posted in Programming
2 Comments
Data encryption in Linux using Truecrypt
Personal data security is often overlooked by many computer users today. As people use their computers more, they never stop to think about how much personal data is accessible on their hard drive. I have been looking for a safe … Continue reading
Posted in Freedom, Linux
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AC Motor / Generator Project
This project started one night while I was lying in bed trying to visualize how an AC motor worked. I knew that it was different from a DC motor as in it did not require brushes and the speed was … Continue reading
Posted in Eletronics
3 Comments