User manual

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Digital tube display number

Experiment component

 4-bit digital tube x1

 220 Ω resistance x4

 Breadboard & jumper wire

Connection

Driven digital tube current limiting resistor is certainly indispensable, there are 2 ways of limiting

resistor connection. The first one is connected with D1-d4 anode, totally connect four. This

connection method’s benefit is needs of relatively less resistance, but generates different the

digital brightness. The brightest is 1, 8 is the darkest. Another connection is use the other eight

pins. The digital brightness of this method will be more like, but need more resistance. The

experiments use eight 220Ω resistances.

Refer to figure below wiring for the 5643A