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Download PSpice 9.1 Student Version, including features found in the 9.1 Web Update. Take an opportunity to test drive PSpice A/D, OrCAD Capture, and PSpice Optimizer. Read the release notes for capabilities and limitations.

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A valuable interactive reference tool for hobbyists and engineers, containing more than a thousand electronics, electrical, mechanics, maths, computer science and PIC microcontroller topics

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With FiltersCAD, you can design lowpass, highpass, bandpass and notch filters with a variety of responses, including Butterworth,  Chebychev, Inverse Chebychev and Elliptic in addition to custom responses.

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PSU Designer II is designed to help you with the design of simple linear (unregulated) mains power supplies, as often found in tube amplifiers.