Recently I build a new set of loadspeakers called Bragi. I did not design them they are availabla as a DIY kit from Seas. Or directly from my home page. Bragi. I wanted a set of loadspeakers with litte variations in the impedance curve to use with my transformer coupled amplifier . Bragi fulfileld this criteria quite nice. I did not have 19mm plywood available, but I had 21mm. I therefore made some small changes to the box as can be seen in my modified drawing below.

I recently assembled a Vellman K4040 vacuum tube power amplifier. The amplifier works well. It is nice to have an amplifier with the full schematics and part numbers in order to do repairs. Here are some pictures of the process. It was hard taking a good picture of it fully assembled because it is so shiny. My reflections can clearly be seen. K4040 with the cabinet open. K4040 with the cabinet closed.

In 2005 I wrote a simple program to use to train in the use of the Doomsday method. I recently improved it with logging capabilities and released it as free software under the GNU GPL v3 license. You can get the ragnarok at github. Releases can be foud here. Below are two screen shots. The first is compiled with Visual Studio 2013 on Windows 7 and run under Windows 7. The second is compied and run with Mono on KDE4 on GNU/Linux.

Zet processor is an open implementation of the so widely used IA-32 architecture (generally called x86). It is implemented in Verilog and can be synthesized for FPGAs. One of the supported development boards is the Altera DE1 Board. DE1 only has one PS/2 port so mouse is not supported on that board. But the board has many IO-ports and the mouse PS/2 pins are mapped to some of the IO pins.

I recently tried Bitcoin mining on a Arrow SoCKIT development board and concluded that Bitcoin mining was to hard given my hardware. Therefore I decided to try Litecoin mining on my SoCKIT. The algorithm used for Litecoin is scrypt. It is supposed to be harder to use FPGAs and ASICs to do Litecoin mining compared to Bitcoin mining. As a starting point i used FPGA-Litecoin-Miner from github. I ported the code for the BeMicro development board to the SoCKIT.