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Description: AT89C2051-based of four electronic clock kit Supply voltage: 3V ~ 6V PCB Size: 52 x 42..
US$2.74
0.56 Inch 4 Bit Red Digital Tube Electronic Clock DIY Electronic Production Suite Main chip: AT89C20..
US$4.39
Amano TCX21 Punch Clock..
US$144.43
Resistor 510?: R1-R44Â Resistor 4.7K?: R45, R46, R47Â Resistor 100K?: R49Â Resistor 100M?: R48Â ..
US$8.49
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