https://fixme.ch/w/index.php?action=history&feed=atom&title=Fixme.ch%3AOldWiki%2FMagnetic_Cards 2026-04-23T21:09:24Z Revision history for this page on the wiki MediaWiki 1.25.1 https://fixme.ch/w/index.php?title=Fixme.ch:OldWiki/Magnetic_Cards&diff=14039&oldid=prev 2019-03-06T20:36:44Z

<p>1 revision imported</p> <table class='diff diff-contentalign-left'> <tr style='vertical-align: top;'> <td colspan='1' style="background-color: white; color:black; text-align: center;">← Older revision</td> <td colspan='1' style="background-color: white; color:black; text-align: center;">Revision as of 20:36, 6 March 2019</td> </tr><tr><td colspan='2' style='text-align: center;'><div class="mw-diff-empty">(No difference)</div> </td></tr></table>

Rorist https://fixme.ch/w/index.php?title=Fixme.ch:OldWiki/Magnetic_Cards&diff=14038&oldid=prev 2015-05-02T00:51:05Z

<p></p> <p><b>New page</b></p><div>=Raspberry pi (CMOS &lt;- TTL level voltage attenuation)=<br /> <br /> The &quot;level converter&quot; in this case is only needed to convert from 5V to 3V3 levels, and can consist of a simple voltage divider. the 3V3 level from a CMOS output needs no conversion for most 5V inputs.<br /> <br /> You can create a simple attenuator to 3V by using a top 2K2 (2.2k) and a bottom 3K3 resistor, it will work even at high speeds, because the GPIO input is high impedance and its capacitance is relatively low, so the signal isn't degraded much.[https://www.raspberrypi.org/forums/viewtopic.php?f=2&amp;t=5219]<br /> <br /> 2K2<br /> 5V in ——/////—+— 3V out<br /> 3K3 |<br /> GND —–/////—-<br /> <br /> <br /> =Liens divers=<br /> <br /> http://bit.ly/lf1XQY<br /> <br /> http://bit.ly/lE5NaZ</div>

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