circuit board 1...

..COMPONENTS USED..

1x circuit board

2x 1k ohms resistors

2x 560 ohms resistors

1x 5v  (LED) yellow

1x 5v (LED) green

2x c547 B.J.T

plus jumper and power + earth wires

This circuit board i made is based on an injector circuit, using bi polar juntion transistors to amplify signal from ECU.

This particular circuit uses both a 5v and 12v input,.The resistors i used are a simple current flow control device.

A 12v current supply is sent to the collector of (bjt) and 5v to the base which in return lets current flow from the collector to emitter then to ground.

VD (voltage drop) was measured across all components with the following results..

R13 = 6.60v

R14 = 10.4v

R15 = 10.1v

R16 = 6.72v

LED (green) = 2.50v

LED (yellow) = 2.55v

V-CE = 0.05v

V-CE = 0.05v

V-BE = 0.88v

V-BE = 0.88v

These results were what was expected and this circuit board worked exactly how it was intended to.