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Here is an example circuit designed with Circuitlab. It contains two input wires and two output wires. For simulation purposes the sine wave generator is added to the design. The outputs should be connected to oscilloscope.

Figure 3. An example circuit containing two resistors and two capacitors.

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When you are ready you turn around your box and seal it with skrews.

Figure 5. The (almost) sealed gray box.

Figure 6. The gray box ready or analysis.

Analysis

When you have tested your boxcircuit, the teacher labels all the boxes and gives you another box. Your aim is now to analyse the other gray boxteam's design.

• Make careful measurements
• Observe the amplitude and the phase shift on different frequencies
• Repeat your measurements, if necessary
• Based on your measurements, try to figure out how it is designed, e.g. what's inside the box.

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