how do i use a 7805 voltage regulator with a 6 volts power supply?
A 7805 needs to many volts to drop across it to work well at only 1 V differential. Try and find a "Low Drop Out" (LDO) regulator instead, like an LM2940-5 Steve
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By accepting that it will not regulate very well and that it will produce less than 5 V out