• LTSPICE is a circuit simulation program available at www.linear.com/designtools/software (you can download this simulation program to run on your Windows or Mac operating system). This program is quite useful for analyzing circuits in terms of DC biasing and AC analysis.
• You can convert your computer via its soundcard audio inputs into a spectrum analyzer via the Spectran software program at http://digilander.libero.it/i2phd/spectran.html.
• A program to run on your computer pertaining to software-defined radios (SDRs) is available at http://winrad.org/. You can search the Web for various SDR front-end circuits to build, which will be connected to your left and right audio inputs on your computer. Winrad will process the signals to receive AM, FM, single-sideband, and CW (Morse code) signals.
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