CAN'T get enough current!!!

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Guru

Yes, probably going to need an effective 5V supply

Perhaps review the specifications for the "thermal printer" and figure out what the requirements/expectations actually are.

Measure the voltages when functioning.

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AlaAuthor

Senior

Dear clive1

I provided an external 5v supply to my STM32F407 discovery board, and turned the board on, but still, low speed...

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