Simplest way to turn 3V into 5V : r/electronics
To be fair, the boost converter chip that does basically all the work in the MintyBoost is only a couple of bucks. The rest is basically just a PCB, connector, and analouge components which, as you said, are cheaper in bulk. Also, compare the cost of the MintyBoost kit at $19.95 to the more basic 5V converter at $10.95 (or just $5.95 for the board).
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