<story><title>Debugging a Live Saturn V</title><url>http://www.zamiang.com/post/debugging-a-live-saturn-v</url></story><parent_chain></parent_chain><comment><author>nn3</author><text>If you like these kinds of stories, Boris Chertok&amp;#x27;s memoirs have a lot more from the Russian early launches during the space race. He was in charge of electrical systems in many of the Russian rockets.&lt;p&gt;NASA history has an excellent four volume translation of his memoirs. In volume 2 he describes the development and testing of the R7 (Soyuz) rocket:&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.nasa.gov&amp;#x2F;connect&amp;#x2F;ebooks&amp;#x2F;rockets_people_vol2_detail.html&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.nasa.gov&amp;#x2F;connect&amp;#x2F;ebooks&amp;#x2F;rockets_people_vol2_deta...&lt;/a&gt;</text></comment>
<story><title>Debugging a Live Saturn V</title><url>http://www.zamiang.com/post/debugging-a-live-saturn-v</url></story><parent_chain></parent_chain><comment><author>rwmj</author><text>Switching a relay in a flammable atmosphere is ... bold.  Does anyone know what voltages were used?&lt;p&gt;Edit: Seems like 28 volts DC unregulated supply (&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;ntrs.nasa.gov&amp;#x2F;archive&amp;#x2F;nasa&amp;#x2F;casi.ntrs.nasa.gov&amp;#x2F;19740021163.pdf&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;ntrs.nasa.gov&amp;#x2F;archive&amp;#x2F;nasa&amp;#x2F;casi.ntrs.nasa.gov&amp;#x2F;197400...&lt;/a&gt;), which was regulated to 5V and 56V depending on where it was used (&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Saturn_V_instrument_unit#Power&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Saturn_V_instrument_unit#Power&lt;/a&gt;)</text></comment>