DONGKER LED Flashing Tree DIY Kits Electronics Soldering DIY Module Soldering Practice Learning PCB Board Electronics Soldering Tree Module Kits with 28pcs 5mm LED Greeen Dream Light Circle

Parameter:     1>.Work Voltage:DC 4.5V~5.5V     2>.Work Current:500mA     3>.Work Module:Switch Control     4>.Work Temperature:-40?~85?     5>.Work Humidity:0%~95%RH     6>.Size(Installed):44*44*108mm Installation Steps(Please be patient install!!!):     1>.Step 1: Install 3pcs Copper pillars and M3 Screw on Acrylic Welding Template.     2>.Step 2: Process 24pcs LED(Not all LED!!!).Curved LED’s shorter pin(negative pole) and form a right angle.Please be careful not to damage the LED.     3>.Step 3: Install the LED ring.Put the already processed LED on acrylic template.Longer pin(Positive pole) outward. Shorter pin(Negative pole) interconnection.     4>.Step 4: Use a soldering iron to fix LED the negative pole(Shorter pin).The soldering iron cannot touch the LED pins for a long time, otherwise it will damage the LED.     5>.Step 5: Cut off excess pins.Just cut shorter pin!!!     6>.Step 6: Install others 2pcs LED rings as the same method.     7>.Step 7: Install 1pcs MINI USB Female Socket at J1.     8>.Step 8: Install 1pcs Toggle Switch at S1.     9>.Step 9: Install 1pcs DIP-8 STC15F104W at U1.There is a dot on one corner of the IC and there is a mark on PCB where the IC can place on.These two marks are corresponding to each other and are used to specify the installation direction of the IC.     10>.Step 10: Install and fix the first layer LED ring.Note that the pins of these LED are not bent.     11>.Step 11: Put some tin on the root of positive pole in order to fix next layer LED.