INTRODUCTION TO BIASING

 

we will develop a circuit with 2 led lights where different voltages and currents are required. In order to obtain the  voltages and currents are required we will add resistors to our circuit.

 

 

 

 

 

this is the calculation of the resistors  R1 and R2  that will be needed. also we will use physical resistors that are closest to our calculated resistors R1 and R2 

 

 

 

 

After the calculations we then proceeded to building our circuit. This circuit was built with two different led lights and two different resistors

 

 

 

 

 

Once our circuit was build we than proceed to adding a voltmeter and an amp meter to each branch where the current is divided. Here is a picture of the diagram drawn in the lab manual and the physical circuit. Note we only had two DMM, therefore we measured each branch once at a time.

 

 

 

 

 

 

 

 

After we had the measurements of the current and voltage drop, we than did the same measurements of one of the branches by removing an led. we also measured the other branch by removing the other led.

 

 

 

 

 

 

here is a table of the measurements

 

 

conf	Iled1	Vled1	Iled2	Vled2	Isupply
1	11.85 mA	4.7	7.71mA	1.99	19.37
2	14.93mA	5.72	X	X	14.93
3	X	X	12.06mA	2.06	12.06

 

 

Here are the questions and the solution of the questions asked in the lab

 

 

 

 

In conclusion the measurement were close to our theoretical values. the reason of why the discrepancy was due to the fact that we used different Resistors. The power out was only 40 percent of that of the power supply, this is possible because the other 60 percent was used in the resistors itself. We also concluded that the measurements obtained when the led's were removed were consistent with what we were suppose to obtain.