1set DIY Alarm Clock Soldering Practice Kit 4.5V-5.5V DC 6 Digits DIY Clock Kit Auto Display Time For Students And Diyers

Product Introduction:

Product power supply voltage: 4.5V-5.5V DC

Product size: 129.2CM * 7.86CM;

DIY piece weight: 85 grams

Packing: 1Set

This product is a 24-hour digital circuit clock, using chips such as CD4518, CD4511CD4081, CD4013CD4060, etc. The circuit does not contain a microcontroller, so there is no program. The time can be calibrated in minutes and seconds, and it does not have an alarm function. This kit mainly consists of a second signal generator, a counter, a decoding display, and a timing circuit. The second pulse is precisely divided by a high-frequency signal generator to obtain a 1HZ square wave signal, and the timing is relatively accurate

The second signal generator consists of CD4060 and CD4013, generating a square wave signal with a frequency of 1HZ. CD4060 is a 14 stage binary frequency divider/oscillator. It forms a 32768Hz oscillator with external resistors R44, R43, C1, C2, Y1. After 14 levels of binary division, a square wave signal with a frequency of 2HZ is obtained at pin 3. CD4013 contains two independent D flip flops, and one of them is connected to form a binary counter. By counting the input 2HZ square wave signal in binary, the second signal CD4518 can be obtained as a double decimal addition counter. Use 3 CD4518 to time hours, minutes, and seconds, with hours configured in 24 base and minutes and seconds configured in 60 base. The counting result of CD4518 is output in BCD code form from pin 00-Q3 to BCD decoder CD4511. CD4511 converts the BCD code into a display segment code that lights up the corresponding digital tube, forming recognizable Arabic numerals on the digital tube to visually display the current timing result.