300 SMD Component Soldering Test Kits High-Strength Practice Board Skill Contest PCB Soldering

Description This kit contains 0805 packages of resistors capacitors chip capacitors chip resistors chip crystals chip LED lights chip diodes and chip packages such as sop4 sop20 TQFP4 etc with 12 chip group tests Area the welding difficulty is arranged from low to high each group can be tested independently with short circuit and virtual welding test functions can judge whether the welding is successful or not according to the display of LED lights there are 12 groups of patch test areas containing a total of 300 Chip welding components can improve the welding ability speed and circuit maintenance ability of various chip components through welding to meet the difficulty of the competition and with self check function you can see the welding results and welding errors after power on Principle description 1 J1 J2 are the power supply input terminals of the whole SMD board connect AC6VCan work normally all LED lights of this kit when working normallyAll can work normally starting with each group of LEDs flashing Every time it blinks all LEDs are lit at the end and then blink again This cycle is used to check whether the LED works and whether it is soldered If it is found that the corresponding LED is not flashing it indicates that there is an error in welding Or soldering 2 AC9V power is rectified by D1 D4 diodes and then passes through eachFilter capacitor to pin 1 of the regulator chip 78M05 LED97 is always on the wholeThe current circuit works