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Simplest way is to add another regulator, but it has to be an LDO regulator, not a 7805. For example, the AP2210N-5.0TRG1 has only a few hundred mV drop at 100-200mA and can handle up to +15V in. It's advertised as being able to withstand negative inputs as well, but I don't see a specifically stated voltage limit on that. Be sure to use the recommended ...


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