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I am sorry bro but your knowledge is in complete......I knew mobile gives 4.2 volt but in rare care it usually gives only 3.7v which makes my circuit safe...
yes this is use and threw power bank.....but in my next project it is clearly mentionhow to charge it...
I m still working in a model which get charged so that we can re use it many tyms.
from where I can buy piezoelectric disc at 20rs per piece...
how many disc are needed for this shoe, 4 disc are enough?
can I make shoe charger by using 4 piezo disc only..
REUSE YOUR OLD MOBILE BATTERY TO MAKE KEY SIZE POWER BANK
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