Week 11
As I have not yet obtained the 0.2 ohm resistor, I have temporarily replaced it with a 2.7 ohm resistor until I get the proper one. Hopefully it will be good enough to test the circuit.

The circuit has been powered up and is able to adjust voltage levels but I cannot determine if the current adjuster is working. This is because I cannot get a reading from the multimeter which is strange as I know there is current there as there is an led next to where I am testing for current. When the circuit is powered up the led lights but when I break the circuit and close it with the multimeter the led does not light. The multimeter is not allowing current to pass through it.

On the multimeter ther are options for testing DC an AC, I pressed the AC button and the led lit up. this is intersting as I am not supplying the circuit with AC. this will have to be investigated further.

Week 10

The components required have been ordered and the circuit build started. The ITB ordering sysyem is having some problems so I sourced some of the components myself from ebay. I have everything but am awaiting two 0.2 ohm resistors which are on order.

This is the circuit so far, it is not completed. The most interesting thing abut this circuit so far is the high power transistor which is the silver device on the top left. It is transistor which uses its own case rather then an ouput pin as it's collector. 

Week 9

This is week nine overall but week one in semester two. As the prvious charging circuit was not suitable another solution must be found. There is a circuit diagram on the LM317 datasheeet that can take an input voltage and produce an output which can have it's voltage and current levels adjusted independantly of each other.

There are some components on it which will have to be ordered through from ITB. The 0.2 ohm resistor on the top right, signal diode 1n457, high power transistor and an lm301a op amp.

Week 8

A report has to be submitted on for this part of the project module so this week has been devoted entirely to the report.

Week 7

The current regulator circuit has been built. It is a simple circut and did not take long to build. Unfortunatly when testing it I discovered that while the circuit is well able to regulate current the voltage levels are uncontrollabe and unpredictable. The batteries need a specified current and voltage level to charge them so this circuit will not be feasible.

Week 6

From week 5 I have a bare circuit diagram. This week I am working on the regulator part of the circuit. I will be using an LM 317 voltage regulator. It should be adjustable as the three batteries need different currents. There is an adjustable regulator circuit on the LM 317 data sheet and I am researching this to see if it will work.

Week 5

At the end of week 4 I started to design the the charging circuit using Cadstar on the lab pc's. When the circuit is complete I will write the VB code and build the circuit on a breadboard for testing. If this goes well the circuit will transferred to a printed circuit board.