Voltage regulator with low voltage alarm (v2)
So after the previous attempt, I did a little refinement.
This one is almost perfect: it has 2A voltage regulator from 2s to 5v and a voltage alarm circuit adopted for 7.2v alarm voltage (3.6v/cell). The buzzer is attached on leads and not on the board - more convenient I think.
If you compare it to the previous version, the difference is noticeable...
I'm almost happy with this one, will try to make it more compact...
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