ABE Digital Clock DIY Kit 6Bits C51 AT89C2051 Chip Electronic Alarm Clock Kit for PCB Board Soldering Practice with Battery Holder for Learning Electronic Craft!

Description

DIY clock kit. Great for students to learn basic mechanical and electronic skills. Widely adopted for school education applications. 【Easy Assembly】 Through the assembly of the watch, you can learn the mechanical and electronic principles. Designed to be easily assembled by beginners, perfect for learning. (Various Time Functions) Equipped with a wide range of functions as below: High precision time display (24-hour format), time setting, alarm setting, countdown timer, stopwatch, counter, hourly chime. Specifications: Master Chip: AT89C2051 Substrate: Military Grade FR-4 PCB (Size: 4.1 x 2.2 inches (105 x 55 mm), Thickness: 0.06 inches (1.6 mm), Power Supply: DC 7 - 12 V (recommended: 9 V), 5.9 inches (150 mm) power cable included. Review: ハンダ付けの良い練習になりました。約2時間ではんだが終わり電源接続したところ7セグメントled 一部表示がおかしい、、回路図で見当つけ、はんだ不良箇所を見つけました。修正したところ正常に動作しました。