diff --git a/sphinx/source/Ohmpi_V2_00/V2_00_step_03.rst b/sphinx/source/Ohmpi_V2_00/V2_00_step_03.rst
index 8dc79f557f5f2ec63d3f33577490371ab7733d27..c41aea525b11cd6fdcf3ccb9d412aeefae79ffd1 100644
--- a/sphinx/source/Ohmpi_V2_00/V2_00_step_03.rst
+++ b/sphinx/source/Ohmpi_V2_00/V2_00_step_03.rst
@@ -36,7 +36,7 @@ In the following presentation for an Ohmpi 64 electrodes, we will use the addres
    +--------+------------------------------------------------------------+
    |        |   .. image:: step_n_3/a/MUX_00.jpg                         |
    |      1 +------------------------------------------------------------+
-   |        |                                                            | 
+   |        |Mux board pcb                                               | 
    |        |                                                            |                                                                       
    +--------+------------------------------------------------------------+
 
@@ -46,7 +46,7 @@ In the following presentation for an Ohmpi 64 electrodes, we will use the addres
    +--------+------------------------------------------------------------+
    |        |   .. image:: step_n_3/a/MUX_01.jpg                         |
    |      2 +------------------------------------------------------------+
-   |        |                                                            | 
+   |        |Installation of the 150 Kohm resistors                                                              | 
    |        |                                                            |                                                                       
    +--------+------------------------------------------------------------+   
    
@@ -56,7 +56,7 @@ In the following presentation for an Ohmpi 64 electrodes, we will use the addres
    +--------+------------------------------------------------------------+
    |        |   .. image:: step_n_3/a/MUX_02.jpg                         |
    |      3 +------------------------------------------------------------+
-   |        |                                                            | 
+   |        |Installation of the mosfet ZVN4206A                         | 
    |        |                                                            |                                                                       
    +--------+------------------------------------------------------------+      
    
@@ -67,7 +67,7 @@ In the following presentation for an Ohmpi 64 electrodes, we will use the addres
    +--------+------------------------------------------------------------+
    |        |   .. image:: step_n_3/a/MUX_03.jpg                         |
    |      4 +------------------------------------------------------------+
-   |        |                                                            | 
+   |        |Installation of the diode-1n4007                             | 
    |        |                                                            |                                                                       
    +--------+------------------------------------------------------------+    
    
@@ -77,7 +77,7 @@ In the following presentation for an Ohmpi 64 electrodes, we will use the addres
    +--------+------------------------------------------------------------+
    |        |   .. image:: step_n_3/a/MUX_04.jpg                         |
    |      5 +------------------------------------------------------------+
-   |        |                                                            | 
+   |        |Installation of the relay                                   | 
    |        |                                                            |                                                                       
    +--------+------------------------------------------------------------+  
 
@@ -87,7 +87,7 @@ In the following presentation for an Ohmpi 64 electrodes, we will use the addres
    +--------+------------------------------------------------------------+
    |        |   .. image:: step_n_3/a/MUX_05.jpg                         |
    |      6 +------------------------------------------------------------+
-   |        |                                                            | 
+   |        |Instalation of the terminal screw                           | 
    |        |                                                            |                                                                       
    +--------+------------------------------------------------------------+
 
@@ -97,7 +97,7 @@ In the following presentation for an Ohmpi 64 electrodes, we will use the addres
    +--------+------------------------------------------------------------+
    |        |   .. image:: step_n_3/a/MUX_06.jpg                         |
    |      7 +------------------------------------------------------------+
-   |        |                                                            | 
+   |        |Installation of generic male header                       | 
    |        |                                                            |                                                                       
    +--------+------------------------------------------------------------+ 
 
@@ -107,7 +107,7 @@ In the following presentation for an Ohmpi 64 electrodes, we will use the addres
    +--------+------------------------------------------------------------+
    |        |   .. image:: step_n_3/a/MUX_07.jpg                         |
    |      8 +------------------------------------------------------------+
-   |        |                                                            | 
+   |        |Installation of Pin strip (6 pins)  and pin strip (16 pins) | 
    |        |                                                            |                                                                       
    +--------+------------------------------------------------------------+  
 
@@ -117,7 +117,7 @@ In the following presentation for an Ohmpi 64 electrodes, we will use the addres
    +--------+------------------------------------------------------------+
    |        |   .. image:: step_n_3/a/MUX_08.jpg                         |
    |      9 +------------------------------------------------------------+
-   |        |                                                            | 
+   |        |Installation of DIP Dual In Line Socket 2*14                | 
    |        |                                                            |                                                                       
    +--------+------------------------------------------------------------+  
 
@@ -127,6 +127,20 @@ In the following presentation for an Ohmpi 64 electrodes, we will use the addres
    +--------+------------------------------------------------------------+
    |        |   .. image:: step_n_3/a/MUX_09.jpg                         |
    |     10 +------------------------------------------------------------+
-   |        |                                                            | 
+   |        |Installation of Adafruit TCA9548A                           | 
    |        |                                                            |                                                                       
-   +--------+------------------------------------------------------------+     
\ No newline at end of file
+   +--------+------------------------------------------------------------+
+
+.. table::
+   :align: center
+   
+   +--------+------------------------------------------------------------+
+   |        |   .. image:: step_n_3/a/MUX_10.jpg                         |
+   |     10 +------------------------------------------------------------+
+   |        |Installation of MCP23017                                    | 
+   |        |                                                            |                                                                       
+   +--------+------------------------------------------------------------+  
+
+
+**PART B** Test of MUX board
+======================================================   
diff --git a/sphinx/source/Ohmpi_V2_00/step_n_3/a/MUX_10.jpg b/sphinx/source/Ohmpi_V2_00/step_n_3/a/MUX_10.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..22bdca2ac5b44182e19801e4b00cdedfbec43864
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