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Experiment #7: Introduction to SolderingPrinciples and Biomedical EngineeringLiz MatsiyevskiyECE 2110_31GTA: Zhehan YiOctober 29th, 2015 Liz MatsiyevskiyExperiment #51
Introduction:The purpose of the experiment was to learn about how EKGs work and how to use EKG amplifiers to measure heartbeat. Another purpose of the experiment was to learn how to construct a simple LED circuit to monitor heartbeat and learn how to solder components to a PCB. Background Information:Vmax= VpkEquation 1 – Vpk for HeartbeatV=IREquation 2 – Ohm’s LawFigure 1 – BioAmplifier Circuit SchematicLiz MatsiyevskiyExperiment #52
Figure 2 – LED Circuit SchematicFigure 3- Possible 3-Lead EKG Configuration (Earth is Ground)Methods and Materials:Equipment ComponentsAgilent DSO1024A Digital Oscilloscope(1) Resistor – 50 UFI Model 2122 BioAmplifier(1) Red LED Prototype BreadboardBNC to Mini-Grabber Lead SetBNC to BNC CableWeller WD1002 95W Soldering StationPCB Printed in Room 304BIOPAC Disposable Monitoring ElectrodesBIOPAC Signa Gel Electrode GelStranded Wire for SolderingLiz MatsiyevskiyExperiment #53
Experimental Procedures:A) PrelabThe prelab involves getting accustomed to the circuit for the BioAmplifier and the LED. The prelab involves building Figure 2in Multisim. Use an AC Voltage component as your voltage source with the values listed in Figure 2. Use the LED red component under diodes/LED as the red LED. Calculate RLIMITallowing only 20 mA to pass through the circuit. Assume that the voltage drop across the LED is 1.75 V. Run the simulation and write down what happens to the LED. Run a Transient Analysis that shows both the voltage source and the voltage of the resistors for 5 cycles. Answer the following questions: What happened to the LED when you ran the simulation in Step 3?What do you notice about the output voltage in your Transient Analysis?Describe the behavior of the LED in terms of open-circuit