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Week 4- Set back In lab hours This week we combined each part of our circuit that was responsible to us separately and tested its function. We rebuilt the circuit we obtained on a breadboard to another two strip boards in order to make the whole system easier to carry. The circuit is shown below in figure 1. Two solar panels and the little port on Tp4056 that could be connected to the main electricity are used to charge the battery pack. When switched on, the battery pack would then generate the power into the amplifier circuit. Figure 1 As we expected to charge the phone we only need to plug it into the circuit, but it did not work. When we plugged it into an old iPhone 5 that is damaged but still could tell if it is being charged for testing, the phone reacted as its screen lit up, however, the battery kept dropping. %%%The video of the Phone reacted to the charger is presented in the next blog%%% Possible reasons After doing some research, we found it seems th...
Week 2- Group meeting after the lab hours We organized another meeting after lab hours in the morning. · SC confirmed that he had finished testing and everything for the solar panels and charging circuit was working as expected. · JX confirmed battery output for 3.6V/3.7V and he and SC confirmed that the charger circuit could withstand no more than a 5V output therefore we agreed to use a 3.7 V input and model the output as 8V with a load current of 800 mA. · GC will now redesign the LM2577 chip to work with these values and put another order form for additional components, with the expectation to test his circuit on Friday 17 th February. · Project documentation was allocated for each member and is as follows: GC = project management forms SC = poster – GC and JX will communicate across designs as and when needed. JX =...
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