big day.. FYP 2 presentation .. WISH ME LUCK... !

This is some of my poster design.. ;)

Finalizing The circuit

Finalizing The circuit

As for the final circuit, I had to reconstructed as a back up for presentation day.
It takes about 5 days to make this circuit on the breadboard functioning.
The picture below shows the waveform that resulted from the output electrode.

Then, the electrode will be measured by using clamp meter to check whether the electrode is giving the correct value or not. The maximum value that can be accepted by human body is 10mA.

The picture above show how the clamp meter works. The value that been displayed by clamp meter is 0.01A and it is equal to the required value which is 10mA.




The output consists of two electrodes that will attach on the skin and the picture below shows how the attachment of electrode on the skin.

Prototype of Electronic Muscle Stimulation is as below which the circuit will covered by a black casing. On the side of the casing consist of two switches (on/off), knob for minimizing or maximize the resistance to get a different frequency and pulse duration and also the wire of electrode.

As for this circuit, I managed to find the suitable current transformer that suit for this circuit. It is small transformer with 230V to 12V, 100mA.

Troubleshooting

Processing PCB

Progress in making,

1) The most important thing is Printed Circuit Board. Next, put the OHP paper on the PCB.

                           

                               

                               

2) PCB added to the liquid solution ferric Chloride (FeCl3) for etching process. FeCl3 powder mixed with warm water and mix depending on how fast the circuit to be completed. Silica layer PCB soaked up entirely detached and removed and washed with clean water.

                               

                               

3) After the PCB will be included in a special liquid developer. Developers will remove the silicon oxide (carbon) and the circuit design will be seen clearly. Then PCB rinsed with clean water.

                               


4) Below the circuit was completed etching and foot hole drilled;

                               


5) Lastly, the PCB is ready to be used but before placing the component, the hole must be punch first.