Shenzhen CXCW made in china good quality ODM blue 0.5 inch 2 digit 7 segment led display
Basics
CC means Common cathode CA means common anode
Dot matrix module, digital tube, and bars are regularly arranged LED (LED light-emitting diode) products, Generally, colors are red, yellow- green, green, yellow, blue and white.
LED's normal operating current is generally 1-20mA, the larger the current the higher the brightness. Brightness required, the current in this range.
Different colors of the forward voltage drop (Vf commonly represented) are different, red, yellow - green, yellow is about 1.8V, green, blue, white, about 3.1V, LED parallel drive voltage constant. For large-size digital tube, LED is connected in series, the number must be multiplied by the total pressure drop led series, namely Vf * N, the driving voltage must be greater than the total pressure drop led to light.
Led drive current limiting resistor should be added protection, current limiting resistor R values determined by the following formula:
R = (Vcc-Vf * N) / I, where Vcc is the supply voltage, Vf for the voltage drop, N is the number of LED in series, I bit operating current (unit A, 1A = 1000mA), such as: Vcc = 5V, Vf = 1.8, N = 1, I = 10mA, then R = 320Ohm, available resistor 330Ohm. If the product is blue, Vf = 3.1V, then R = 190ohm. The actual parameter calculation based on operating voltage and current needs.
LED power Pled = Vf * N * I, the current limiting resistor dissipates Pr = I * I * R, for example, the above example: Pled = 1.8 * 1 * 10mA = 18mW, Pr = 10mA * 10mA * 330ohm = 33mW .
The above are single LED computing, such as the simultaneous need lights N pieces of LED, please * N.
The following is a common LED drive circuit (not prohibited limiting resistor test !! avoid burn LED.
2 bit digital led display
Trade Terms | FOB,CIF,EXW |
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Shipping Termes | DHL,UPS,EMS,TNT,Aramex,China Post,HK Post |
Packing | Original Packing Reel/Tube/Tray/Customers Request |
the questions which our partner ask most
Q1. How about the quality?
A: We tested 100% before we ship out.We offer 90- 180days quality assurance.
Q2. What is your terms of payment?
A: Order below 10000USD is T/T 100% in advance .
B:Order over 10000USD T/T 50% as deposit to arrange goods.and rest 50% before delivery.
C:Sample order we can support
PAYPAL , WERTERN UNION,UnionPay and Alipay.
Q3. What is your terms of delivery?
A: EXW, FOB, CFR, CIF.(defaults EXW for all quotation)
Q4. How about your lead time?
A: There are no lead time for in-stock products.We can ship out within 1-3days after you confirmed the payment.
B:Customized product,we will ship out within our professional invoice show.
Q5. What is your sample policy?
A: Most of products,we can offer free samples;you just need pay the shipping cost.
Q6:Can we ask support if get trouble?
Sure, if there is any quality problems or questions;we could offer technical support or return service .
Q7. Can we return back the goods?
A: Sure, if you are not satisfied with the quality;you can send the original box back to exchange or refund.You pay the return ship cost.We pay the back cost.
B:If you get wrong item and the mistake made by yourself;we can offer return too.But you should pay the ship cost both.And you can ask us to exchange or refund.