Different units are used in different parts of the world. If you need to make units conversion now you can do it automatically by one mouse click. Just click on >>THIS LINK<< to open online conversion of almost all units you can ever need. These units are not only from area of electronics.
When designing active filter for your project you will need software tools to help you get right component values as well as minimize time spent designing. Tool that will hel you automate this process is FilterLab from microchip.
FilterLab® is an innovative software tool that simplifies active filter design. Available at no cost, the FilterLab® active filter software design tool provides full schematic diagrams of the filter circuit with component values and displays the frequency response.
Often you need to read resistor value that is color coded. You can do it by finding color values in table or you can do it easy way by using automated online resistor color code value calculator below. Depending on resistor tolerance and production technique, it can have four or five color code. Carbon film resistors usually have 5% tolerance and 4 colors code, while more precise metal film resistors have 1% tolerance and 5 colors code mark.