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    Problem with robot made using arduino

    i used four 12v dc 60rpm gear motor, for movement and arduino as microcontroller and controlled by hc-05, body of the robot weights around 4kg. Problem is, "when i power motor and press right in my Bluetooth app it dosn't turn right, when i removed weight it turned properly, HOW TO OVERCOME THIS...
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    How To Interface 12v 10w Solar Panel To 12v 1.3ah Battery

    I need to connect 12v 1.3Ah battery to 12v 10W solar panel do i need any circuit for it or i can directly connect them? also i want to power arduino from that battery. Please help
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    Increase In Output Pulse As Supply Increases In 555 Timer, Why?

    This circuit is constructed using 555 timer for 1sec on and off delay, output of 555 timer was connected to coin vibrating motor through transistor. But as power supply increases from 5v on and off delay increases. Any solution for this issue???
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