Copy of ECE 205 Lab 4

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University of Illinois, Urbana Champaign *

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Electrical Engineering

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Feb 20, 2024

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ECE 205 Lab 4: NE 555 Statement of Purpose: One of the oldest integrated circuits which remains popular today (40+ years after it was introduced) is the “555” timer. The specific part number of 555 chip in our Kit is the LM555, and we have both Texas Instruments (LM555) and STMicroelectronics (NE555) datasheets on our Resources page on the course website. The NE555 integrates the following components: an internal transistor that allows external capacitors to charge and discharge, a trigger input to charge the capacitor and a threshold to discharge the capacitor. When the voltage on the trigger is below .33*Vcc, the transistor is put into charge mode. When the voltage on the threshold surpasses .67*Vcc (where Vcc is the battery voltage, around 9 V), the transistor goes to discharge mode. Plan Materials: ● Wires ● DC Power Supply ● Oscilloscope ● Cable Connectors ● Benchvue Software ● 100 Ohm Resistor ● 1000 Ohm Resistors ● 1 μF Capacitor ● 0.1 μF Capacitor ● 555 Timer Assembly: ● Assemble the circuit as shown in Figure 1 ● Connect the Multimeter and the DC Power Supply into the circuit as shown. ● Make sure you use 2 cable connectors from the oscilloscope to the circuit to observe the voltage changes Figure 1: Circuit Setup Figure 2: Experimental Setup Execution Procedure:

To begin the experiment, create a circuit using the schematic based on figure 3. For the values of R2, utilize a fixed value of 1K Ω and the C a 1 μF capacitor. Make sure to supply a proper voltage of 9v using the VCC and GND. As a final note make sure to connect the output of the timer to the oscilloscope to create the proper graphs. The value of R1 will vary between 1k Ω, 10k Ω, and a photoresistor. These three different values generate the waveform of the Vc(t) and Vout of the circuit. For each different resistor value, record the results on the oscilloscope. Figure 3: Circuit Schematic Results and Conclusions Results: Component Period (ms) 1000 Ω Resistor 2.08 10000 Ω Resistor 8.22 Photoresistor 3.78

1K Ohm Resistor 10K Ohm Resistor Light Sensor Ohm Resistor Figure 4: A collection of snapshots of the results in the oscilloscope for all the test cases Conclusion: Using a 555 timer, we were able to create a wave based off the charging and discharging of a circuit. We figured out that the period is dependent on the resistance and that larger resistances create larger periods. This makes sense because this wave was constructed using charging and discharging an RC circuit and the time constant for RC circuits is directly proportional to the resistance.

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