Added a bit schematic explaination

invoff/README.md

@@ -4,3 +4,17 @@ Dual Invert and Offset
 
 <img src="images/Invoff_Panel_1080.png" height="400px" width="auto" />
 
+## Schematic
+
+Attenuverter with Offset Bias and external Offset CV Input.  
+
+![](images/schematic_invoff1.png)  
+
+
+
+## Powersection
+
+Plug in any way because the bridge rectifiert will always channel the positive part to the positive rail.  
+
+![](images/schematic_powersection.png)
+