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The next mistake is simply "over-complexity" from a kit by Future Kit, a Thailand firm.  Look at the first two transistors on the solar charger circuit. They are intended to turn on when the voltage from the solar cell is greater than the voltage of the battery. But a simple diode can be used to do this. That's why you need more than one person to design and test anything you are making. A simple mistake like this can easily slip through and cost you a lot of embarrassment and expense. We have already shown on previous pages, that components can quire often be omitted at great saving to the manufacturer.