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eBay Digital Circuit Clock DIY Electronic Kit Electronic Clock Teaching Kit + Case Overview This product is a 24-hour digital circuit clock, using CD4518, CD4511, CD4081, CD4013, CD4060 and other chips, the circuit does not contain a microcontroller, so there is no program, hours, minutes and seconds can be calibrated, without alarm function. This kit mainly consists of a second signal generator, counter, decoding display and time calibration circuit. The second pulse is a 1HZ square wave signal obtained by precise frequency division of a high frequency signal generator, which is more accurate in timekeeping. The second signal generator consists of CD4060 and CD4013, which generates a square wave signal with a frequency of 1HZ. CD4060 is a 14-level binary frequency divider/oscillator. It consists of a 32768HZ oscillator with external resistors R44, R43, C1, C2 and Y1. After 14 levels of binary frequency divider, the frequency of 2HZ square wave signal is obtained at pin 3. CD4013 contains two independent D flip-flops, take one of the flip-flops through the line configured as a binary counter, binary counting of the input 2HZ square wave signal can be obtained from the second signal. CD4518 is a double-decimal addition counter. With 3 CD4518 for hours, minutes, seconds, hours configured for the 24-binary, minutes and seconds configured for 60-binary. CD4518 counting results in the form of BCD code from pin Q0-Q3 output to the BCD decoder CD4511, CD4511 will be converted to the BCD code corresponding to the display of the corresponding digital tube light segment code, the digital tube to form a digital can be recognized to visually display the current results. Timing results. Minutes and seconds are counted in 60 decimal, the seconds signal is introduced to the EN terminal of CD4518 through switch S1, and 1 is added to the falling edge of each seconds signal (if the seconds signal is connected to the CLK terminal of CD4518, 1 is added to the rising edge of each seconds signal), and when the counter counts up to 9, Q0-Q3 outputs 1001, i.e., Q3 is 1. As it is a decimal counter, when the next seconds signal arrives, the counter changes from 9 to 0, Q0-Q3 outputs 0000, thus forming a falling edge signal on Q3, this signal is introduced to the ten-digit counter of the second counter, and the ten-digit counter adds 1 to the ten-digit counter after each full count of 10 in the individual counter.When the ten-digit counter value reaches 6, Q0-Q3 outputs 0110, i.e., Q1 and Q2 are both 1 at the same time, and Q1 and Q2 are connected to the counter through an and gate after outputting 1 to the Q1 and Q2 are connected to the reset terminal of the counter through an and gate and output 1, so that the counter counts from 6 to 0 in advance, completing the cycle of 1 hexadecimal counting. The reset signal is also used as the counting signal of the sub-counter, and the sub-counter will be increased by 1 for every full 60 seconds. The sub-counter is also 60-bit, when the sub-counter is full 60, the ten bits of the sub-counter will be reset by a gate, so that the value of the time counter will be increased by 1. When the counter is full 24, the Q0-Q3 of the ten bits will be 0010 and that of the individual bits will be 0100, which will be connected to the counter after Q2 is done with the algorithm, so that the counter can be reset from 6 to 0 in advance. By connecting the Q1 of the tenth bit and the Q2 of the first bit to the reset terminals of the two counters, the hourly counter will return to 0 when the counter reaches the full 24, thus realizing the 24-bit counting. Features 1. This is a 24-hour digital circuit clock kit, using CD4518, CD4511, CD4081, CD4013, CD4060 and other chips. 2. The product is made of high quality material, quality is guaranteed. 3. Can be used for teaching practical training welding, very suitable for DIY enthusiasts 4. Stable product performance, long service life 5. The use of red digital tube, digital clear at a glance Note This product is a kit. It is not soldered and requires some hands-on skills. DIY Kit List: PCB board X1 0.56 digital tube 1 bit common negative X6 470 ohm resistor X2 1K resistor X50 2.2K resistor X3 100K Resistor X1 10M resistor X1 1N4148 Diode X4 103 Monolithic Capacitor X3 32.768KHZ crystal X1 30P Porcelain Chip Capacitor X2 25V 100UF Capacitor X1 KF301-2PX1 6*6*5 Keypad X1 12D07 Toggle Switch X1 16P IC Block X10 14P IC Block X 2 CD4511X6 CD4518X3 CD4081X1 CD4060X1 CD4013X1 case kitX1(optional) Shipping Feedback Contact us Return Policy Shipping Domestic We believe you need to get your purchases as quick as possible. As a general rule your item will be shipped within 24 hours of you purchasing it. We pack and post from Tuesday to Sunday (Mondays we are closed) but definitely get all our mail off to the post office first thing Monday morning for you. Mail gets picked up at 12pm so chances are if you buy before lunchtime your item will leave the same day. International Same as above but understand that depending on what part of the world you are from it does take a little longer to send, delivery can be from 7-15 working days. Also other factors to take into consideration are quarantine and customs regulations in your country. It is also a consideration that customs duties and GST/VAT may be payable at the buyers expense. Combined Postage (for items with shipping charges): We are more than happy to combine postage, just use the Buy it Now function in eBay (but DO NOT PAY after purchasing each item) to buy all the products you need, when you have finished request a combined invoice, we will base the shipping cost on the size, weight and your location. Feedback * When you satisfied with our product and services please leave us positive feedback. * If you have got the package, please confirm “Delivery on time” For us. * If a problem occurs, contact us immediately with any email request. * Just contact us using the ” Ask the seller a question” link on eBay. Your Satisfaction is our Priority. Our goal is to make all our customers as happy as possible while shopping with us. Contact us For anything problem about product, price, shipping or order status, pleasecontact us via eBay message.Just contact us using the ” Ask the seller a question” link on eBay. We expect positive feedback and 5 scores DSR from you. Return Policy We believe our items are so outstanding. We are convinced you will be happy with your Purchase. If you do not satisfy with our items. Please simply return to us within 30 Days in original condition. Just pay for the returned postage. Then we can issue full refund to you after the returned item arrived at our warehouse. 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