AED 2

Description

【Great School Science Project】: The DIY Clock Kits are used to installed to a 4-Digit Digital Electronic Clock. It is widely used in schools to help students learn basic mechanical and electronic skills..
【Easy Assembly】: In addition to teaching basic mechanical and electronic principles, the clock kit is easy to build and is so simple..
【Wide Time Functions】: Wide functions with clock, time set, alarm set, countdown timer, stopwatch, counter, hourly chime, precise time display, and 24 hours format. Accurate Travel Time--the error range ±1 sec every 24 hours..
【Specification】: This Electronic Clock Kit is equipped with AT89C2051 master chip. -Grade FR-4 PCB board (Size: 7"x2"(92x49mm)). Comes with a 150mm power supply wire for DC 7~12V voltage input, typical applications is 9V..
【User Manual】You could learn how to install and set the clock from the website: https://www.youtube.com/watch?v=3VZpj4x8xc8.

Description: YCL-6 makes the full use of the single-chip resources which is featured with the function of alarm clock, countdown clock, stopwatch and counter. Operation Principle: The circuit is mainly composed by the single-chip circuit, display circuit, keyboard input, signal ringing circuit and power circuit. 1. Single-chip circuit: It's based on AT89C2051 which including the Power-on Reset and clock circuit. 2. Display Circuit: The main component is 2-bit digital tube in red. The driver uses the PNP transistor and it's equipped with current-limiting resistance at every port. It's with scanning-driven way and uses P1.0~P1.6. The colon part use four pieces of diode in Φ3 red with scanning-driven way. And it uses P1.7. 3. keyboard input: The key S1~S3 are with reused function which reused with the display part of P3.5,P3.4 and P3.2. And here is the operating principle. Output high level at the related PIN to read out the status of keys and debounce via single-chip system to give the keys with corresponding value. 4. Signal Ringing circuit: It's composed by buzzer and PNP transistor. And the operating principle is that the buzzer will send sound in fixed frequency after the PNP transistor turns on. It's with independent port-driven way and uses P3.7. J1 is used for connecting the extrocontrol equipments which will output the low level when there is no ringing signal, or high level with ringing signal. 5. Power Circuit: It's composed by three terminal integrated circuit which will supply the whole system with the stable voltage. Package included: 1 x C51 6 Bits Digital Electronic Clock Electronic Production Suite DIY Kits 1 x 9V Battery Holder 1 x 9V Battery Wire

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Youmile Digital Clock DIY Kit 6Bits C51 AT89C2051 Chip Electronic Alarm Clock Kit PCB Board Soldering Practice FR-4 for Arduino with Battery Holder

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