Different programs might have different results due to the mathematical model used. So what is left, is a (resistive) voltage divider, consisting of your source, the R from the quartz and the load. This crystal ladder filter calculator is a simple tool for dimensioning crystal bandpass filters composed by 2 to 8 identical quartz crystals and some. The electronics design program that I used is Circuitmaker 2000, which can be downloaded free from a number of sources. We measure exactly at the series resonance frequency, because there, XL and XCs sum up to zero. The purpose of this instructable is to make a comparison between the mathematical model for a 10MHz crystal filter and actually build one using a breadboard and "off the shelf" components including a standard 10MHz computer crystal. Most electronic design today is done with the use of computer software that simulates mathematically the "ideal" device. Since the subject of filters is a complex science in itself and engineering texts have been written on that subject alone, with pages and pages of calculations, I will simply touch on the subject here. A useful crystal filter can be easily made from a standard computer crystal and a couple of resistors and capacitors. Wherever you want to pass a very narrow bandwidth of signal and reject everything else, you will need a crystal filter. It finds itself used in areas as different as smartphones and television transmitters and receivers. The crystal Filter is critical circuit used in most areas of the telecommunications industry.
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