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• Parameters: 1 is a 24-hour electronic circuit clock kit, utilizing CD4518, CD4511, CD4081, CD4013, CD4060 and other chips 2 product is manufactured from tremendous materials, quality assurance 3 Can be used for teaching and coaching welding, very compatible for DIY enthusiasts 4 product performance, long provider life five The use of red digital tube, digital clean at a glance 6 Two specifications are available: with shell and with out shell Product Description: This product is a 24-hour electronic circuit clock, using CD4518, CD4511, CD4081, CD4013, CD4060 and other chips, the circuit doesn't involve a microcontroller, so there isn't any programme, the hours and minutes and seconds can be calibrated, with out alarm function This package mainly contains a second sign generator, counter, deciphering demonstrate and time calibration circuit The moment pulse is a 1HZ sq. wave sign acquired by precise frequency division of a high frequency signal generator, which is extra accurate in timekeeping The second sign generator contains CD4060 and CD4013, which generates a square wave sign with a frequency of 1HZ CD4060 is a 14-level binary frequency divider/oscillator It includes a 32768HZ oscillator with external resistors R44, R43, C1, C2 and Y1 After 14 stages of binary frequency divider, the frequency of 2HZ square wave sign is acquired at pin 3 CD4013 contains two self reliant D flip-flops, take one of the flip-flops in the course of the line configured as a binary counter, binary counting of the enter 2HZ sq. wave sign would be obtained from the second signal CD4518 is a double-decimal addition counter The CD4518 is a double-decimal addition counter three CD4518s are used to time the hours, mins and seconds, the hours are configured as 24, the mins and seconds are configured as 60 The counting results of the CD4518 is in the kind of a BCD code outputted to the BCD decoder CD4511 from the pins Q0-Q3, and the CD4511 converts the BCD code right into a demonstrate phase code that lighting up the corresponding electronic tube, and then types a recognisable Arabic numerals on the digital tube to demonstrate the current timing end result intuitively The minutes and seconds are in 60-bit format Minutes and seconds are counted in 60 decimal, the seconds signal is announced to the EN terminal of CD4518 by way of switch S1, and 1 is added to the falling fringe of every single seconds sign (if the seconds signal is attached to the CLK terminal of CD4518, 1 is added to the increasing fringe of every single seconds signal), and when the counter counts as much as 9, Q0-Q3 outputs 1001, i, Q3 is 1 Since it is a decimal counter, when a better seconds sign arrives, the counter changes from nine to zero counter modifications 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 one counter, after each complete 10 count of the individual counter, the ten-digit counter adds 1 When the ten-digit counter value reaches 6, Q0-Q3 outputs 0110, i, Q1 and Q2 are both 1 on the similar time, and Q1 and Q2 are linked to the counter through a summing gate after which outputs 1 to the Q1 and Q2 are connected to the reset terminal of the counter via an and gate and output 1, in order that the counter counts from 6 to zero in advance, finishing up the cycle of 1 hexadecimal counting The reset signal is also used because the counting signal of the sub-counter, and the sub-counter could be increased through 1 for each full 60 seconds The sub-counter also is 60-bit, when the sub-counter is full 60, the 10 bits of the sub-counter can be reset through a gate, so that the value of the time counter may be elevated by way of 1 When the counter is full 24, the ten bits of the counter will be 0010 and the individual bits of the counter will be 0100, and the 10 bits of the counter could be connected to the counter through a gate with an algorithm and Q2 By connecting the Q1 of the 10th bit and the Q2 of the first bit with the algorithm to the reset terminals of the two counters, the hourly bit might be returned to zero when the counter reaches the complete 24, in order to realise the counting of the 24 hexadecimal DIY free parts transport list: PCB board X1 0 digital tube 1 bit traditional detrimental X6 470 ohm resistor X2 1K resistor X50 2 resistor X3 100K Resistor X1 10M resistor X1 1N4148 Diode X4 103 Monolithic Capacitor X3 32 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 Enclosure shipping list: Acrylic shell X1 set M3*8 screws X5 M3*10 screws X5 M3 Nut X5 M3*10 double move nylon publish X4 Package include: Loose parts X1

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