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.<br>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.
<br>This might also help calibrate voltages, as well.<br>I bounced this suggestion off the ##electronics guys and the conversation went something like this:<br><font size="2"><font color="#204a87">(02:10:12 PM) </font></font>
<font color="#204a87"><b><font size="3">DyDisMe:</font></b></font><font size="3"> Crystal oscillators generate square wave pulses, right?</font><br><font size="2"><font color="#b90fe3">(02:10:19 PM) </font></font><font color="#b90fe3">
<font size="3">SpeedEvil:</font></font><font size="3"> depends</font><br><font size="2"><font color="#b90fe3">(02:10:29 PM) </font></font><font color="#b90fe3"><font size="3">SpeedEvil:</font></font><font size="3"> you can get them producing anything from squarewave to sine
</font><br><font size="2"><font color="#b90fe3">(02:10:43 PM) </font></font><font color="#b90fe3"><font size="3">SpeedEvil:</font></font><font size="3"> to some sort of rectangle poorly specified.</font><br><font size="2">
<font color="#204a87">(02:11:00 PM) </font></font><font color="#204a87"><b><font size="3">DyDisMe:</font></b></font><font size="3"> I'm attempting to come up with a method of cheap calibration</font><br><font size="2">
<font color="#b90fe3">(02:11:10 PM) </font></font><font color="#b90fe3"><font size="3">SpeedEvil:</font></font><font size="3"> For what?<br></font><font size="2"><font color="#204a87">(02:11:16 PM) </font></font><font color="#204a87">
<b><font size="3">DyDisMe:</font></b></font><font size="3"> the soundcard of the hardware I'm developing for is built with 5% parts.</font><br><font size="2"><font color="#02680a">(02:11:17 PM) </font></font><font color="#02680a">
<font size="3">icee:</font></font><font size="3"> most oscillators you buy put out squarewave though</font><br><font size="2"><font color="#02680a">(02:11:20 PM) </font></font><font color="#02680a"><font size="3">icee:</font>
</font><font size="3"> oscillator modules</font><br><font size="2"><font color="#204a87">(02:11:22 PM) </font></font><font color="#204a87"><b><font size="3">DyDisMe:</font></b></font><font size="3"> ok</font><br clear="all">
Anyone have suggestions, questions, comments, etc?<br>-- <br>Ian Daniher<br><a href="mailto:it.daniher@gmail.com">it.daniher@gmail.com</a><br>Skype : it.daniher<br><a href="http://irc.freenode.com">irc.freenode.com</a>: DyDisMe