$11.0 Buy It Now or Best Offer
free,30-Day Returns
Seller Store cool_thing_to_buy
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Location: shenzhen
Ships to: US,
Item: 156284107471
Restocking Fee:No
Return shipping will be paid by:Buyer
All returns accepted:Returns Accepted
Item must be returned within:60 Days
Refund will be given as:Money back or replacement (buyer’s choice)
Unbranded:Unbranded
Type:Circuit Board
SMD/SMT:SMD/SMT
Dimensions:4.75 x 2.75 x 1 inches
MPN:SMD/SMT
Country/Region of Manufacture:China
DIY Kits SMD/SMT Components Soldering Practice Skill Board Electronic Project ABOUT US: we has been selling Business & Industrial Consumer Electronics,and Computers, Tablets & Network Hardware online since 2010. We are authorized dealer for many of the brands we carry. We also have other models of products, if you need, you can also send a message to us for consultation items at significant savings. Shop confidently with us. Customer satisfaction is a top priority for us. Description: 【SMD/SMT Components Soldering Practice Board】: Input voltage: DC5V. The positive pole is connected to +, and the negative pole is connected to -. After the SMD components are soldered, power on to form a running water lamp to detect the effect of the soldering. 【Before Soldering】: Some SMD components are relatively small, be careful not to lose them. The side of the diode with the green dot is the negative electrode. This electronic soldering kit is not a finished product, it need to be soldered by yourself. Please refer to the English instructions include in the package. If you have any questions, please contact us first for professional help. 【Great Soldering Science Project】: This soldering DIY kit help you understand the basics of working with printed circuit boards and become familiar with a variety of electronic components, and practice soldering skills enjoyably for you and your kids, or students, or DIYers. 【Easy to Assemble】: The connection that was clearly mapped and labeled on the board makes it easy to assemble. And you can refer the marks on PCB board to soldering each component. If it can’t work after soldering, please contact us for support. 【Perfect After-Sale Service】: Please read the User Manual before installing. Our policy is to make our customers happy. If you are not 100% satisfied, just contact our customer service. Working principle: Since the voltage across capacitors C1-C9 cannot change abruptly when powered on, the 2nd pin of NE555 is at a low level, and the 3rd pin of the output terminal is at a high level. The current is charged to C1-C9 through R61-R70 and RP1-PR5. When the voltage to 2/3 of power voltage, the level of pin 3 of the output terminal changes from high to low, the internal discharge of NE555 is turned on, and the capacitors C1-C9 are discharged through pin 7 of NE555, until the voltage across C1-C9 is lower than 1/3 of the power voltage, the level of pin 3 of NE555 changes from low level to high level, and C1-C9 is charged again, thus forming a circular oscillation. Changing the size of RP1-RP5 can change the output frequency of the oscillator. The NE555 clock oscillation signal is continuously added to the 14 pin of the 4017. There are 10 transistors connected to the output terminals of the 4017, which to drive the 10 LEDs. Under the action of the clock signal, a high level is generated in turn, then L1-L10 are lit in sequence, forming the effect of a running water lamp. After the SMD components are soldered, power on to form a running water lamp to detect the effect of the soldering . Package includes: 1 set SMD/SMT Shipping Policy: Your order will be shipped within 1-2 business days ( Excluding Weekends and Public Holidays)after your payment clear.. Economy shipping: Ship via air mail service to US 1 to 3 Weeks.,UK EU,2 to 4 Weeks. other country 3 to 6 Weeks,You may sometimes experience longer delivery time due to customs-related delays. Please let us know. ( No service on Sundays and public holidays) – Expedited shipping:If you want to get it fast(4-7 days ship),Please choose expedited shipping,It must add 20usd-32usd shipping fee (according to your country) – Extra costs（duties taxes）These charges are the buyer’s responsibility. Please check with your Country’s customs office to determine what these additional costs will be prior to bidding/buying. Return Policy: Applicable only for items purchased within 60 days. IMPORTANTLY, DEFECTIVE OR NON DEFECTIVE All Items should be returned in a good/ well-packed condition. Failure to comply with our Terms and Conditions may lead to UNAPPROVED RETURNS. All returned merchandise must be in original factory carton, including all packaging materials, inserts and manuals, warranty cards (not filled-out) and all other accessories (i.e. screws, bass knobs, plastic coverings, protective films, etc.) Failure to meet any of these requirements will result in a higher restocking fee or denial of return request. All returned merchandise are to be tested and inspected according to reasons/ claims why it is being returned before any decisions will be made. Shipping charges are non-refundable. Only the purchase price of the product is refundable. REASONS FOR UNAPPROVED RETURNS Physical damage: Item is scratched, torn, wet, burned, blown, signs of misuse, and faulty installation DEFECTIVE or non DEFECTIVE Factory sealed items: If it’s opened and tampered except for certain items Notes:Installation and removal costs are not the responsibility of the seller. Feedback: All DOA (Dead on Arrival)/ Defective items must be reported within 48 hours after receiving the item ebay message. Once your item arrives in satisfactory condition, Please leave positive feedback for us and 5 stars DSR score. Our automatic system will do the same for you. Please contact us if you have any question on the items, we will handle these within 1 business day. Allowed 48 hours for our delayed response during long weekends or holidays. We are in endeavor to provide you best service and keep you a happy buying experience from us. Contact US: We only reply to emails received within the ebay email platform(ebay messages). We answer emails Mon-Fri. Please allow up to 48 hours for us to respond. All emails are answered! If you do not receive a response, please resend your email. Sometimes Spam filters prevent emails from being properly delivered. If you do not receive a response after a second request, please provide an alternative email address for us to respond to. No one is EVER ignored!
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