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This java applet is an electronic circuit simulator that displays the frequency response of circuits. When it starts up, it displays a simple high-pass filter. You can adjust the cutoff frequency using the slider on the right. The "Circuits" menu contains a lot of other sample circuits for you to try.

If you don't have Java, get the Java plug-in.

Main circuit applet.

Zip archive of this applet.

The source.

(Version 0.91, posted 4/26/14)