300-Smd-Komponenten-Lötprüfkits Hochfestes Übungsbrett Zum Löten Von Leiterplatten Im Geschicklichkeitswettbewerb
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Description:
Note: It comes with DIY KIT,not a finished products.
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 AC6V
Can work normally, all LED lights of this kit when working normally
All 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 each
Filter capacitor to pin 1 of the regulator chip 78M05 (LED97 is always on, the whole
The current circuit works normally), and the entire test is provided by the 3-pin output DC5V.
Test circuit works.
3. This test circuit is controlled by a single chip microcomputer with 8 groups of 8-bit LED lamps.
Make. Each group is composed of one 74HC573 and 74HC164.
In order to control 8 LEDs, a total of 12 groups, Figure 1 is a group of control principles
Flashing water All light up
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