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diff --git a/praktikum-1/Praktikum1_PSD.circ b/praktikum-1/Praktikum1_PSD.circ
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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<project source="4.0.0" version="1.0">
+  This file is intended to be loaded by Logisim-evolution v4.0.0(https://github.com/logisim-evolution/).
+
+  <lib desc="#Wiring" name="0">
+    <tool name="Pin">
+      <a name="appearance" val="classic"/>
+    </tool>
+  </lib>
+  <lib desc="#Gates" name="1"/>
+  <lib desc="#Plexers" name="2"/>
+  <lib desc="#Arithmetic" name="3"/>
+  <lib desc="#Memory" name="4"/>
+  <lib desc="#I/O" name="5"/>
+  <lib desc="#TTL" name="6"/>
+  <lib desc="#TCL" name="7"/>
+  <lib desc="#Base" name="8"/>
+  <lib desc="#BFH-Praktika" name="9"/>
+  <lib desc="#Input/Output-Extra" name="10"/>
+  <lib desc="#Soc" name="11"/>
+  <main name="main"/>
+  <options>
+    <a name="gateUndefined" val="ignore"/>
+    <a name="simlimit" val="1000"/>
+    <a name="simrand" val="0"/>
+  </options>
+  <mappings>
+    <tool lib="8" map="Button2" name="Poke Tool"/>
+    <tool lib="8" map="Button3" name="Menu Tool"/>
+    <tool lib="8" map="Ctrl Button1" name="Menu Tool"/>
+  </mappings>
+  <toolbar>
+    <tool lib="8" name="Poke Tool"/>
+    <tool lib="8" name="Edit Tool"/>
+    <tool lib="8" name="Wiring Tool"/>
+    <tool lib="8" name="Text Tool"/>
+    <sep/>
+    <tool lib="0" name="Pin"/>
+    <tool lib="0" name="Pin">
+      <a name="facing" val="west"/>
+      <a name="type" val="output"/>
+    </tool>
+    <sep/>
+    <tool lib="1" name="NOT Gate"/>
+    <tool lib="1" name="AND Gate"/>
+    <tool lib="1" name="OR Gate"/>
+    <tool lib="1" name="XOR Gate"/>
+    <tool lib="1" name="NAND Gate"/>
+    <tool lib="1" name="NOR Gate"/>
+    <sep/>
+    <tool lib="4" name="D Flip-Flop"/>
+    <tool lib="4" name="Register"/>
+  </toolbar>
+  <circuit name="main">
+    <a name="appearance" val="logisim_evolution"/>
+    <a name="circuit" val="main"/>
+    <a name="circuitnamedboxfixedsize" val="true"/>
+    <a name="simulationFrequency" val="1.0"/>
+    <comp lib="0" loc="(120,190)" name="Constant">
+      <a name="value" val="0x0"/>
+    </comp>
+    <comp lib="0" loc="(120,230)" name="Constant">
+      <a name="value" val="0x0"/>
+    </comp>
+    <comp lib="0" loc="(120,250)" name="Constant"/>
+    <comp lib="1" loc="(260,210)" name="NOR Gate"/>
+    <comp lib="1" loc="(370,230)" name="AND Gate"/>
+    <comp lib="5" loc="(440,230)" name="LED"/>
+    <comp lib="8" loc="(94,196)" name="Text">
+      <a name="text" val="A"/>
+    </comp>
+    <comp lib="8" loc="(94,236)" name="Text">
+      <a name="text" val="B"/>
+    </comp>
+    <comp lib="8" loc="(94,256)" name="Text">
+      <a name="text" val="C"/>
+    </comp>
+    <wire from="(120,190)" to="(200,190)"/>
+    <wire from="(120,230)" to="(200,230)"/>
+    <wire from="(120,250)" to="(320,250)"/>
+    <wire from="(260,210)" to="(320,210)"/>
+    <wire from="(370,230)" to="(440,230)"/>
+  </circuit>
+</project>