Lab 2 - Introduction to Biasing

Introduction to Biasing

Objectives:

1. Demonstrate biasing ability by establishing the correct voltage across and current through two LED's so they operate correctly.
2.  Design circuit with use of resistors for biasing and apply KVL and KCL to complete design.

Process:

1. Problem
          Find appropriate values of R_1 and R_2 in given sample circuit schematic for the
LED's to function properly and light up. Measure voltage, current, and resistance to analyze circuit for efficiency and battery discharge.

2. Given Assumptions
          LED_1:  5 volts and 22.75mA
          LED_2:  2 volts and 20mA
          Voltage Source: 9 volts

3. Circuit Calculations

 4. Built Circuit

The LEDS work!

Testing after LED2 was removed from circuit

5. Data Collected

6.Data Analyzed

Conclusion:

Objective one and two were simultaneously met during circuit calculations. The goal was to find an appropriate resister value that would drop the voltage from burning out the LEDS. Those values were 175.82ohms and 350ohms. A crucial lesson learned during this process was that resisters are pre-made at more frequently used values for the market and therefore we could not acquire the necessary ohmage. Instead new resisters of similar value were implemented into the the circuit and caused some discrepancy between our between actual measurement and theoretical calculations yielding a 54.71% error.