As work on a USB ADC continues, somewhere along the lines the problem of calibration came up both with regards to the sound card, and the in-development peripheral. It was quickly suggested that a crystal oscillator based circuit be used to generate square waves to help calibrate the time scale of the measure activity. This might also help calibrate voltages, as well. I bounced this suggestion off the ##electronics guys and the conversation went something like this: (02:10:12 PM) *DyDisMe:* Crystal oscillators generate square wave pulses, right? (02:10:19 PM) SpeedEvil: depends (02:10:29 PM) SpeedEvil: you can get them producing anything from squarewave to sine (02:10:43 PM) SpeedEvil: to some sort of rectangle poorly specified. (02:11:00 PM) *DyDisMe:* I'm attempting to come up with a method of cheap calibration (02:11:10 PM) SpeedEvil: For what? (02:11:16 PM) *DyDisMe:* the soundcard of the hardware I'm developing for is built with 5% parts. (02:11:17 PM) icee: most oscillators you buy put out squarewave though (02:11:20 PM) icee: oscillator modules (02:11:22 PM) *DyDisMe:* ok Anyone have suggestions, questions, comments, etc? -- Ian Daniher [EMAIL PROTECTED] Skype : it.daniher irc.freenode.com: DyDisMe
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