This diffraction grating is a standard diffraction grating used to separate white light into its spectrum.
The Unihedron CapSelector provides an inexpensive way to tune a VLF loop over a wide range (120 - 5510 pF) of capacitances.
It replaces expensive and bulky high-value variable capacitors or decade capacitor banks.
It is a passive device and therefore requires no power.
Electromagnetic Radiation Spectrum poster
This poster includes all known ranges of EMR including
brain waves, communication frequencies, microwave background radiation, etc,
as well as the audio spectrum, all organized by octaves.
Grocery Getter Helper
This program will enable you to shop for groceries much faster.
I originally needed something like this many years ago but did not
have the tools to program it for Windows, so I found something close
to it written by someone else and
used that until I found the tools to write my program for Linux. FREE / Open Source.
A Linux shell program that says the date. Simply type saydate and the program speaks the actual date
(e.g. "the date is thursday november the twenty-fifth nineteen-ninety-nine"). saydate home. FREE / Open Source.