I made a project in the simulator proteus. In this project, I use Arduino Uno R3, an LCD monitor, a buzzer, a LED. I saw there is a need minimum volt and I use 5 bolt port but then the circuit is not working. So how can I get 8 or 10 volts from Arduino?
How were you connecting the 5V to UNO.
I made a project in the simulator proteus.
Why are you asking here? Proteus is a commercial product - go ask their help desk.
Dry using a Dickson Charge Pump (https://en.wikipedia.org/wiki/Voltage_multiplier#Dickson_charge_pump) on a couple of PWM pins.
The vin pin is made to handle 12v.that's the max the Arduino can handle before it fries but it can handle a little more voltage like mane 14v.