Day 5 - Datasheet and circuit diagram

Theory

How to find a datasheet?

1. Check a part number
2. Googing on the net and find the datasheet according to the part number

Draw a circuit diagram by using the following components.
Components:
12V power supply
12V bulb
relay
switch
transistor
resistor

hint:
transistor -> relay control
relay switch -> bulb






<solution>




Write avaiable voltages in each label:

	ON(V)	OFF(V)
A	12	12
B	12	0
C	12	12
D	0.3	12
E	12	12

Practical

Experiment No.8

Set up the following circuit on a bread board. Use a 470R for Rc and a BC547 NPN transistor.

Pick five resistors between 2K2 and 1M for Rb. You want a range of resistors that allow you to see Vce when the transistor is the saturated switch region and when it is in the active amplifier region. I used 47K, 220K, 270K, 330K and 1M, but this can vary depending on your transistor. Some may need to use 2K2. Put one resistor in place, and measure and record voltage drop across Vce and Vbe. Also measure and record the current for Ic and Ib. Then change the Rb resistor and do all the measurements and record the new readings. Do this for each of the resistor values above.

Record here:

Rb: 2k2  Vbe: 0.792V  Vce: 0.027V  Ib: 0.001A  Ic:0.004A
Rb: 10k  Vbe: 0.701V  Vce: 0.046V  Ib: 0.001A  Ic:0.004A
Rb: 220k  Vbe: 0.702V  Vce: 0.570V  Ib: 0.001A  Ic:0.003A
Rb: 680k  Vbe: 0.665V  Vce: 2.302V  Ib: 0A  Ic:0.001A
Rb: 1M  Vbe: 0.698V  Vce: 2.560V  Ib: 0A  Ic:0A