How to Read a Schematic
That&#x27;s a breakout board - mostly connectors, little functionality.  Not too interesting to study.  A simple blinky board with a 555 timer would be a better place to start.<p>Here&#x27;s one of my schematics[1] with a detailed explanation of how it works [2] This is a small board which is used to power old Teletype machines.  It&#x27;s a mixed analog&#x2F;digital board, with a custom switching power supply onboard to provide the high output voltage needed using only power from the USB port.<p>This gives some insight into why modern power supplies have so many parts. They work by creating big spikes, and they&#x27;re always a few microseconds from a short circuit. So they need bypass capacitors and ferrite beads in the right places, and protection circuitry in case something fails.  (MOSFETs tend to fail into the ON state.)<p>If you really want to learn this stuff, get &quot;The Art of Electronics&quot;, by Horowitz and Hill.<p>[1] <a href="https:&#x2F;&#x2F;raw.githubusercontent.com&#x2F;John-Nagle&#x2F;ttyloopdriver&#x2F;master&#x2F;board&#x2F;ttydriver01.png" rel="nofollow">https:&#x2F;&#x2F;raw.githubusercontent.com&#x2F;John-Nagle&#x2F;ttyloopdriver&#x2F;m...</a><p>[2] <a href="https:&#x2F;&#x2F;github.com&#x2F;John-Nagle&#x2F;ttyloopdriver&#x2F;blob&#x2F;master&#x2F;README.md" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;John-Nagle&#x2F;ttyloopdriver&#x2F;blob&#x2F;master&#x2F;READ...</a>