Checking

The date of the checking of our power supply is late for 2 days because of our fault. It is supposed to be Tuesday but it was rescheduled and turned to Friday. It’s not the power supply who caused delay but our attitude. We asked forgiveness to our instructor and thank God we are forgiven and given a chance to show our power supply and be checked.

Final Stage of The Puzzle

 Now the final stage, we put the positive and the negative terminals.Then we put on the plug and it must be knotted so that it will not be pulled easily (advice from a friend). We connect the plug to the fuse and the switch.

Then we put a pair of screw on the most heavy and expensive part of the power supply. Then we secure the casing of the power supply to give some protection to its internal parts. Then we tested it if it really works by using the multimeter.

Day 5

 This day, we connect wires, for us, this is the hardest part of our project because one mistake can cause failure to our project. We begin in connecting wires in the selector switch because it's a little bit easy.

We connect all volts of the selector to the diodes except zero due to it's more complicated process. After that, we connect wires for the switch and last to the transformer and for the terminals. It's a little bit easier because less wire is used that is needed to be soldered.

Day 4

 On this day, we start putting the anodes, cathodes, Capacitors, and the Resistor by the use of our soldering equipment. "The soldering iron must not be too hot before using it onto the components"

that's what the instruction manual of the soldering iron that we used so before trying it directly to our power supply, we keep on testing it to other old equipment until it is ready to use.

Day 3

On the 3rd day, after soaking and drying, we start the process of polishing our PCB by taking off the left masking tape we used to protect our design from ferric chloride.Then after that we start drilling some holes in it and again use sand paper to clean it.                       

Day 2

In the 2nd day, we start cutting out the excess masking tape that doesn't fit our design....

Then after cutting we've prepared our ferric chloride together with our stop watch to monitor how long are we going to soak our PCB.

Day 1

We've started to give a shot to our project by smoothing our 'PCB' using eraser and started covering our PCB with masking tape, then trace the design our instructor (Arrianne Michelle Florendo) gave us. It is quite difficult but it's fine for us.After tracing, we've successfully transferred our design to our PCB. ^_^ 

INTRODUCTION ABOUT POWER SUPPLIES

A regulated power supply is an embedded circuit, or stand alone unit, the function of which is to supply a stable voltage (or less often current), to a circuit or device that must be operated within certain power supply limits. The output from the regulated power supply may be alternating or unidirectional, but is nearly always DC (Direct Current).

The type of stabilization used may be restricted to ensuring that the output remains within certain limits under various load conditions, or it may also include compensation for variations in its own supply source. The latter is much more common today.

 Applications

• D.C. variable bench supply (a bench power supply usually refers to a power supply capable of supplying a variety of output voltages useful for bench testing electronic circuits, possibly with continuous variation of the output voltage, or just some preset voltages; a laboratory (lab) power supply normally implies an accurate bench power supply, while a balanced or tracking power supply refers to twin supplies for use when a circuit requires both positive and negative supply rails).
• Mobile Phone power adaptors
• Regulated power supplies in appliances