Injector Circuit

Our task for the week was to make a injector circuit , we had to calculate and choose our resistors and what transisitor to use. Then we also had to put it onto a bread board and test it to see if it will work. We also had to design our board on a program called loch master and place our components and see if it will work before we start making it.
Components :

 Power Supply
2x 500Ω Resistors , 2x 440Ω Resistors i had to change them to a  470Ω Resistor because that was the closet we had.
2x BC547 Transistors
2x Led's , I chose one Green LED and one Yellow LED but values were the same of 1.8v
Wires

Calculations:

It was really simple after you had all your figures and formulas.
LED = 1.7 V
Transistor BC 547 
,Vce = 0.6 V/45mA , Vbe = 0.6 V/6mA ,  : Ic = 100 mA
Beta = 100
To find out what resistor i was going to use for R14 & R15 i calculated 10v/0.02 which was 500 , so now i round it of and used a 470 resistor which was close to my calculation
So we have a 12v power supply which will go to the 2 470Ω resistors in parallel , now we are left with 10volts going to the leds.

Suppy Voltage - LED - Transistor = Available voltage
12v-1.8-0.2=10v

Now we have voltage going through to the transistor from the collector, and 5 volts from the base.

NPN BC547 Datasheet

SYMBOL	PARAMETER	CONDITION	MIN.	TYP.	MAX.	UNIT
VBEsat	base-emitter saturation voltage	IC = 10 mA; IB = 0.5 mA; note 1 IC = 100 mA; IB = 5 mA; note 1		700 900		mV mV

A Technical Explanation :
We have voltage going to the  LEDs, 5v supply from PWM0-1 & 5v coming from PWM1-1 to switch the LED's on and off 
The LEDs show that the circuit is working , and as we increase the frequecny/ RPM the lights start to flash faster. The LED's show the injectors opening and closing .
Problems:
Luckly i never had any problems and finished my circuit on time but if there was a fault i could pick it up easily using a multimeter by test each component. If it has no reading then we will need to see if there is a bad connection or that the component will need to be replaced

Reflection:
If i had a opportunity to do this circuit again , id try get the LED's different colour like red and blue so it will grab attention and will look cool. I would also try and improve it by making it more simply and neater.Buildaing this circuit should me how a transistor works and the different things it can do

Here is my Circuit on the bread Board



Tested the Circuit and it worked :) so now i can start designing my board on loch master



This Video show the Injector circuit working on the bread board. As i turn up the Frequency/ Rpm the LED's flash faster 

My Circuit design on loch master

This is a video showing the injector circuit working as we turn up the Frequency/ RPM the LED's will flash faster.This shows when you Rev higher the injectors will open faster and at idle the LED's will blink slower

Here Is my Circuit Finished 

My Soldering Skills , Nice and shinny