Quote:
Originally Posted by flerchin
*If your pc, or other audio device, already has speakers hooked up, set it to drive some high frequency, eg 28,000 Hz, and simultaneously drive another frequency close to that one, eg 28004 Hz. You should hear an oscillating tone when they are both being produced, if your pc is capable of generating them.
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So I tried this, and it seems only this computer can produce the sound. The system I'd actually hook up can't play any useful frequencies. I was reading a bit on the 555 timer. I may have to go that route.
Quote:
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Originally Posted by kaligula
Steve Gibson did this, and recounts the story in Security Now #248.
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I'm listening now. From the title, I'm very hopeful. Thanks!