This structure covers how to make amazing magic chasing effect LED lights for your lover, father, mother, classmates and good friends. This is quite easy to build as long as you have patience. I recommend having some soldering experience if you build this.For the accessories you can get on here
35 x 1k(or 510) ohm resistors
34 x 5mm LED bulbs
2 x 33pF ceramic capacitors
1 x 11.0592mHz crystal oscillator
1 x 10uf/25v electrolytic capacitor
1 x self-lock switch
1 x Mini USB port
1 x 4 pins of header pin
1 x 40 pins of socket
1 x stc89c52 microchip
1 x love heart PCB
1 x acrylic shell
Inserting the axial-lead resistor is pretty straightforward. As we all know, axial-lead resistor does not have polarity, you no need to identify the anode and cathode while inserting.
Step 2: Soldering the Resistors One by One
I found it was easier to solder the resistor side by side.
After all resistors are soldered, then cut off the legs of all resistors at the back side of PCB. You’d better be careful with the remnants of the cutting legs on the PCB that they may stinging your hands.
Step 3: Solder Crystal Oscillator and Ceramic Capacitors Into the PCB.
The crystal oscillator and ceramic capacitor do not have polarity. You
just insert them into the PCB and then implement soldering. When finish soldering, cut off the remaining legs of them. You must ensure the oscillator is adhered to the PCB or it may cause problems in assembling the microchip to the 40-pin socket in the last step.
Step 4: Solder the Electrolytic Capacitor Into the PCB.
Please NOTE that the electrolytic capacitor has polarity. You need to identify the anode and cathode before soldering. The longer leg is anode. You need to insert the long leg into the ‘+’ side and reserve enough lengths of legs for making some possibilities to sleep the capacitor. If you keep the capacitor standing, you may fail to assemble the microchip in the last step.
Step 5: Solder the 40-pin Socket Into the PCB.
You need to insert this socket into PCB in the right direction. Please beware of the semicircle symbol on both of the socket and PCB. They should be in the same direction.
Step 6: Solder the LED Into the PCB
The LED bulb has polarity, you need to identify the anode and cathode and then insert them into the PCB one by one before soldering. The longer led is anode pin while the shorter leg is cathode. If someone has trimmed the legs, try finding the flat edge on the LED’s outer casing. The pin nearest the flat edge will be the negative, cathode pin.
The longer pin of the LED should be inserted into the hole near the + symbol.
After you insert all of LED bulbs into the PCB, you must ensure the LEDs are adhered to the PCB.
The remaining LED legs in the above picture looks askew. You need to pull the LED leg and make it perpendicular to the PCB and then solder one leg only. For adjustment purpose, please leave another leg to the second round of soldering.
When you ensure every LED is adhered to the PCB then you can solder another leg and cut off remaining legs.
Step 7: Solder the Mini USB Port and Switch Into the PCB
Step 8: Insert the Microchip Into the Socket
YOU MUST TAKE CARE OF THIS STEP!!!
When you first receive just about any DIP IC, the legs will not be parallel to the main chip body. The legs will bend out slightly. In my experience, it is best to adjust them before trying to insert into the IC socket. It is very important that this step be done with care, to avoid damaging the expensive chips. Go slow, use light pressure, and take your time. Grasp the IC with 2 hands and make the pins adhere to the desktop. You want to bend the pins at the same time so they bend right where the pins change from wide to thin, use a slow, steady, and even pressure to bend them all at once until they go straight down from the chip.
(I used one hand to grasp the IC just for a better shooting angle, you should use 2 hands).
Now, it time to install the IC into the socket. Before installing, we need to find the right direction. The semicircle on both of IC and socket should be in the same direction.
Once you have the chip orientation, we can begin installing it. You want to be able to look under the chip at the row you are placing. The goal here is NOT to insert them into the socket! For now, we want to make sure we have them in the holes properly. Adjust the chip as needed to get each side of the 20 pins on the far row seated, ready to press down. If there are any pins bent out of line and not seating in the socket, you need to take it down and make that row of pins adhere to the desktop, repeat the bending process again until each side of 20 pins fit into the hole of IC socket. Now that all 40 pins are in the proper holes, apply a slight steady pressure in the middle of both ends of the chip. Take it slow, and watch to see if any pins catch and refuse to go in the holes. Adjust them as needed. As soon as you're certain they're all going in as planned, increase pressure until it won't go down any further.
Congratulations!!! The part of the PCB has been assembled successfully.