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

$25.99
  Availability: In Stock
  Shipping: Free Airmail 
  Estimated Delivery: 
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  •   Shipping Methods

    Handling Time

    Before we can ship your order, we prepare your products, do strict quality-control tests and carefully package the items. The time it takes to prepare your items for shipping is separate from the delivery time. It usually takes 1-3 business days to ship out .

    Shipping Methods

    You can choose the preferred shipping method on the cart page during the checkout process. We offers 3 international shipping methods:

    1. Airmail – Free untracked economy shipping via national postal services (HK Post, Singapore Post, China Post, PostNL, Swiss Post, Sweden Post, USPS, Royal Mail e.t.c.)
    2. Airmail Registered – Tracked shipping via national postal services (HK Post, Singapore Post, China Post, PostNL, Swiss Post, Sweden Post, USPS, Royal Mail e.t.c.)
    3. Expedited Shipping – Express shipping with courier delivery (DHL, UPS, FedEx, TNT)

    Delivery Time

    Airmail and Airmail Registered Area Estimated Delivery Time
    United States, Canada 7-25 business days
    Australia, New Zealand, Singapore, United Arab Emirates 10-25 business days
    United Kingdom, France, Spain, Germany, Netherlands, Japan, Belgium, Denmark, Finland, Ireland, Norway, Portugal, Sweden, Switzerland 10-25 business days
    Italy, Brazil, Russia, South Africa 10-45 business days
    Other countries 10-35 business days
    Expedited Shipping 3-10 business days to Worldwide

    Note: If you choose an expedited shipping, please remember to leave a valid contact number, this is required for expedited shipping’s courier delivery.

  •  Returns & Refund

    Last updated October 05, 2022

    Returns

    If you are not completely satisfied with your purchase for any reason, you may return it to us for a full refund within 15 days from delivery date. All returned items must be in new and unused condition, with all original tags and labels attached.

    Return Process

    To return an item, please email our customer service at sales@alexnld.com to obtain a Return Merchandise Authorization (RMA) number. After receiving a RMA number, place the item securely in its original packaging, and mail your return to the following address:

    Alex NLD
    Attn: Returns
    RMA #
    HaGiborim St 8
    Tiberias, 14388
    Israel

    Please note, you will be responsible for the return shipping charges. We strongly recommend that you use a trackable method to mail your return.

    All customers should contact us and obtain Return Merchandise Authorization (RMA) number before sending anything to us. We will not be responsible for returned item(s) without notifying us in advance.

    Refunds

    After receiving your return and inspecting the condition of your item, we will process your refund to the credit / debit card or PayPal account which was used to place the original order.

    Please allow at least seven (7) days from the receipt of your item to process your refund. Refunds may take 1-2 billing cycles to appear on your credit card statement, depending on your credit card company. We will notify you by email when your refund has been processed.

    Exceptions

    If an item is found damaged or defective on receipt, we kindly ask you to contact us within 15 days from the delivery date to arrange a refund or exchange without physical return of the item.

    Please provide us with following:

    1. Photos of the front and back sides of the packaging box;
    2. A photo, video or screenshot of the defective item or the defective part of the parcel.

    Our customer service team will communicate with you to arrange a refund or reshipment without physical return of the item.

    Warranty & Repair service

    If any of the items you have purchased from us is found defective within 1 year from receipt, you are entitled to a repair under warranty. Please kindly provide us with evidence photos or videos of the defective item. After providing such information to our Customer Service team  and the problem is acknowledged, you can send the items back to us for a repair.

    Note:  Please be aware, we do not cover the cost of the returns fees in  warranty & repair service.

    Order Cancellation

    If you want to cancel an order within 24 hours from confirmation of the payment, you will be entitled to a full refund. It is still possible to cancel an order after 24 hours, provided that it has not yet been shipped. If an order has been shipped, it’s impossible for us to cancel or modify it anymore. If you still want a refund, you required to return the item on it’s arrival.

    Questions

    If you have any questions concerning our return policy, please contact us at:

    +972 054-536-2888
    sales@alexnld.com

     


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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 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


Package included:


1 x High-strength Practice Board

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