Design stage 2

During the building we discovered we needed 2 input sources, one to deliver a positive voltage and the other to deliver a negative voltage. This was one set back in designing to use two voltage sources to power a single component, as no customer will accept to buy such a component. Our project only deals with the regulating of  the voltage. The regulator needs two input. If our project was to be considered in a large scale we will consider using a transformer. The transformer that will be suitable to use is a transformer with two secondary windings as shown below,

Figure 8: Transformer with two secondary windings

From  figure 8 above, we have 3 output which are; the unregulated VDC, the positive and negative for the op-amp. We can see that instead of using two input voltages, we can just use this transformer to replace them. 

  Another issue discovered was the heating of the pass transistor. The heat dissipated was reduced by adding a large resistor at the load. However, if a smaller load is to be used it is necessary to mount them on a suitable heat sink.