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Phys 3610/6610 Lab 10 Student: TA: A Simple Clock Task: Using only parts from your lab kit: Design, build, and debug a circuit that will count and display seconds from 0 to 9 endlessly. Preliminaries: If the 60 Hz square wave does not look very good on the scope, use a LM 311 voltage comparator to clean it up with the circuit given in fig.1. This is optional, but you should be able to explain how it works even if you do not use it. 60Hz dirty in +12V +5V +5V 22k 2 10k 10k 8 − 10k 3 LM311 + 1 7 60Hz clean out 4 -12V Figure 1: Cleaning up a clock signal Now that you have a clean 60 Hz square wave (or 60 Hz of logic pulses), you design your circuit from a couple of divide-by-N counters, a decade scaler, a BCD seven-segment driver, and the 7-segment display. As usual: Document all your work as you design your circuit. As you build up your circuit through its various stages, make sure that along the way each stage functions as anticipated. Log the tests you design for each stage along with the test results. It may take a bit of planning to make it fit onto your breadboard. -1-