Circuit board 1

Component list
NPN Transistors x2 C547
LED x2 yellow, white/red.
470 ohm resistor x2
820 ohm resistor x2
Red and white wires.

12-1.8=10.2
10.2/0.02=510 There are no 510 ohm resistors so I used 470 ohm resistors for R3 and R4.

5-0.7=4.3
Using the data sheet to find the current needed to saturate the transistor.
4.3/0.005=840 There are no 840 ohm resistors so I used 820 ohm resistors for R1 and R2.

The LEDs have a constant 12v power supply, but are not earthed. When the 5V power supply is pulsed to the base of the transistors which earths the LEDs power supply causing them to flash which acts like an injector turning off and on.

VD Readings.
VCE T1 0.05 Using this reading on the load graph I can find the Ic and B.
VCE T2 0.05 Using this reading on the load graph I can find the Ic and B.
Vbe T1 0.82 This is the knee voltage drop.
Vbe T2 0.83 This is the knee voltage drop.
R1=9.75 This resistor reduces Voltage input at the collector by 9.75.
R2=10.02 This resistor reduces Voltage input at the collector by 10.02.
R3=4.14 This shows how much the voltage is being reduced before the base.
R4=4.14 This shows how much the voltage is being reduced before the base.
All the readings were correct this time.
This board worked first time, if i was to redo this board again i would compact the components into a smaller portion of the board.