A components list
The things i needed to build my injector circuit was 2 transistor 4 resistor, 2 LED lights and board. and some wires .i took some pictures and a video clip to show how its working .
2 NPN BC547 transistors, and two LED's. Then we had to wire up the components on a bread board to make sure that the circuit works and that we get to practice and get better at it before we build the real circuit and to show up how to wire up the components on the PCB board. we used the resistor calculation to make sure that the all the components were getting the right amperage to make the LED and transistor work correctly
we used to data sheet to find out the correct resistor that we could use .
Thats the video clip i took once i built the circuit board it shows how its working at low frequency and high frequency.
I also built my board on lochmaster its a software that lets you built any sort of circuit board that you want and the one i built i took some pictures of it which is below.
Ohms law
Ohm's lawThe current flow through a Resistance there must be a voltage across that resistance. Ohm's law shows the relationship between the voltage current and resistance.
Kirchhoff's Law:
Kirchhoff's Law says that the voltage supplied to a circuit is used within the circuit before it goes back to the power source. Voltage supplied = Voltage used by the circuit.
12-1.8-0.2= 10 v
R= V/ I
R 10 / 0.2(20ma)
R= 500 ohms
specs transistor
Ic = 100 ma (max)
vce = 45v (max)
vcb = 50 v (max)
vbe = 6v (max)
R = V/ I
R = 4.4 / 0.004
R = 1K100
Blew is a video clip of my PCB board i recored it when i finshed building it to check it and make sure that its working the way it should be anyways here it is.
heres pics of my injector board
LchMaster:
We had to use lochmaster to build our board on there first to make sure it working the way it should be and to to make sure the right amount voltage is supplied etc.. once we done that we get to show it to our teacher to make sure its working fine after that we were allowed to build it on PCB board.
LochMaster is a developers tool for strip board projects. It has useful functions for designing, documenting and testing a board. Therefore you will find features like auto-generation of components lists, a connection test, an editable library with a large number of symbols and components, and many more.The newer the version software the more features it will have because the they always come with newer version so its good to get it updated.
here a link to Lochmaster where you can download a demo.
http://www.abacom-online.de/uk/html/lochmaster.html
Transistors:
How do transistors work?
Transistors stop and start the flow of an electrical current, and they also control the amount of current. The first transistors were made of germanium, which is a good insulator. Scientists "doped" (added impurities to) the germanium, making it into a weak conductor, or a semiconductor. Depending on what was used to dope the germanium, the semiconductor was either N-type (negative) or P-type (positive). An N-type semiconductor lets electrons flow out of the germanium, and a P-type lets electrons flow into the germanium. When an N-type semiconductor is put near a P-type semiconductor, you have a P-N diode, which lets electricity to flow in one direction. If two semiconductors are placed either in an N-P-N pattern or a P-N-P pattern, you have a junction transistor. The junction transistor's center layer is the base. If electricity is applied to the base, electrons start moving slowly from the N side to the P side. As more electrons change sides, their speed picks up. Thus the transistors function as both the switch and the amplifier, allowing control of the amount of electricity flowing through the circuit board.
What is a resistor and how does it work?
The more resistance a thing has, the more it limits current (at a given voltage). In a circuit, resistance and current are inversely proportional. The more the resistance, the more current will be limited and the less current will actually flow. Resistors pay a price for limiting current - they create heat.
A resistor partially conducts current flow, but it heats up as a consequence to having current forced through it by some applied voltage.
Reference
http://www.ehow.com/video_4977215_transistors-work.html
http://curiosity.discovery.com/question/how-do-transistors-work
http://talkingelectronics.com/projects/OP-AMP/OP-AMP-1.html
Moodle
http://www.wisc-online.com/objects/ViewObject.aspx?ID=SSE3603
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