**3.2 Design circuit**

The circuit of the microscope was modulated because:


**Figure 5.** *Modulated circuit of microscope.*

Fuse 1.6 A, Switch (on\off), Zener 12 voltage, DC haloseen lamp 12 v Potentiometer 1MΩ. A new microscope circuit was designed on experimental board and expert in university lab using a power supply unit, it was adjusted on DC current 3A and 12 V, the board connected to the supply and turned on the lamp was illuminated.
