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                                      <item>
                                        <title>A little challenge...</title>
                                        <link>http://www.linuxformat.com/forums/viewtopic.php?p=101152#101152</link>
                                        <description>&lt;br /&gt;
                                      Author: &lt;a href='http://www.linuxformat.com/forums/profile.php?mode=viewprofile&amp;u=58561'&gt;Bazza&lt;/a&gt;&lt;br /&gt;&lt;br /&gt;
                                      Posted: Mon Aug 15, 2011 8:04 pm&lt;br /&gt;&lt;br /&gt;
                                      &lt;br /&gt;&lt;br /&gt;
                                      Hi all...&lt;br /&gt;
&lt;br /&gt;
For the Linux AND electronics experts amongst us...&lt;br /&gt;
&lt;br /&gt;
Have you ever pondered how to get DC, (Direct Current), into or out&lt;br /&gt;
of your computer?&lt;br /&gt;
&lt;br /&gt;
Here is your challenge:-&lt;br /&gt;
&lt;br /&gt;
I won't bother with getting DC INTO the computer as using the&lt;br /&gt;
restrictions below requires extensive knowledge of electronics and&lt;br /&gt;
computer workings; Software is tricky also...&lt;br /&gt;
&lt;br /&gt;
Righto, given potentially 4 levels of DC OUT, (0 being one of them),&lt;br /&gt;
create a simple Program along with a home built Hardware design,&lt;br /&gt;
a &amp;quot;variable&amp;quot; DC output controller. DC accuracy is NOT important for&lt;br /&gt;
this challenge.&lt;br /&gt;
&lt;br /&gt;
These are the restrictions:-&lt;br /&gt;
&lt;br /&gt;
1) NO Integrated Circuits are allowed at all.&lt;br /&gt;
2) 5 Bipolar Transistors of your choice maximum.&lt;br /&gt;
3) Any amount of passive components as required, LCR.&lt;br /&gt;
4) If diodes are needed, then no more than 2 of them and any type.&lt;br /&gt;
5) The code of your choice, (Python is an easy to use language).&lt;br /&gt;
6) No electronics CAD is allowed at all.&lt;br /&gt;
7) No board design CAD is allowed, you are only allowed stripboard.&lt;br /&gt;
&lt;br /&gt;
Let's see if anyone on here can come up with anything...&lt;br /&gt;
&lt;br /&gt;
It is possible... ;o)&lt;br /&gt;
&lt;br /&gt;
Have fun in doing some REAL hacking...&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
EDIT:-&lt;br /&gt;
&lt;br /&gt;
I forgot, you ARE allowed ONE Zener Diode on top of number 4) and&lt;br /&gt;
ONE PP3 Battery plus connector IF you need one.</description>
                                        <comments>http://www.linuxformat.com/forums/viewtopic.php?p=101152#101152</comments>
                                        <author>Bazza</author>
                                        <pubDate>Mon Aug 15, 2011 8:04 pm</pubDate>
                                        <guid isPermaLink="true">http://www.linuxformat.com/forums/viewtopic.php?p=101152#101152</guid>
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