DC 9V SMT Soldering Test Kit Electronic Practice Set

Description 1 J1 and J2 are the power supply input terminals of the entire SMT board It can work normally when connected to AC6V or DC9V When working normally all LED lights in this kit can work normally At first each group of LEDs flashes with water and then flashes at intervals and finally all Light up all the LEDs then flash again and cycle like this to check whether the LEDs are working and whether they are soldered well If it is found that the corresponding LED does not flicker it means that there is a welding error or a false welding 2 The AC6V power supply is rectified by D1 D4 diodes and then through each filter capacitor to pin 1 of the voltage regulator chip 78M05 LED97 is always on the rectifier circuit is working normally and the output of DC5V is supplied to the whole test circuit through pin 3 3 This test circuit is controlled by a single chip microcomputer to work with 12 groups of 8 bit LED lights Each group is composed of 1 74HC573 and 74HC164 One group can control 8 LEDs 12 groups in total Figure 1 is the control schematic diagram of one group When working normally all LED lights are on and can flash Specifications Product Name SMD Soldering Test KitPCB material FR 4PCB boardPCB size 145 100MMpatch tape connection testPower supply mode DC DC9VApplicable objects junior welding patch personnelComponent Description Common patch components are usedS N NameMarkNum Location1103 capacitor 080530C1 C24 C26 C29 C32 C35220P 0805 2C27