DC 9V SMT Soldering Test Kit Electronic Practice Set COD

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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.



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 used

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S.N.	Name	Mark	Num.	Location
	※0805		30	C1-C24
2	20P 0805
	※		1	C25
4	100uf/16V
	※		1	C33
6	The resistance value of the resistor is between 1K-3K ohms※	102	101	R1-R97, R123
7	The resistance value of the resistor is between 0-100 ohms※	101	35	R98-R106,R108-R122
8	The resistance value of the resistor is between 8.5K-20K ohms※	203	1	R107
9	10K exclusion	103	9	RP1-RP9
10	IN4007 diode
	※		97	LED1-LED97
12	78M05
			1	S1
14	8M crystal oscillator
	※		12	U7-U12,U19-R24
16	74HC164
	※		1	U25
18	Single row of needles			,J2
			1

Package Include:
1× SMT Soldering Test Kit