I've recently bought an Arduino Pro Mini, the 3.3V and 8MHz version. The first time I powered it, using the VCC pin, all worked. But, as soon as I attempt using the RAW pin instead, nothing lights up... Is my regulator broken ? Or is this a typical issue ?
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What is the power source you are attempting to connect to the RAW pin? – Majenko♦ May 22 '15 at 20:32
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@Majenko It's an unregulated 5V source – Spirine May 22 '15 at 20:34
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1Check there is solder on the solder jumper SJ1 – Majenko♦ May 22 '15 at 20:36
I am not completely familiar with that specific board, but according to the schematic there is a solder jumper which is used to isolate the RAW voltage regulator from the rest of the system "for low power applications".
I don't know off hand if that comes pre-soldered or not, but check it to make sure it is connected, otherwise the RAW input will do nothing.
