I am doing project using GSM and GPS module. But I dont know the input DC power supply voltage. Can anyone pls tell me how much DC Voltage should i apply to these components to power up the device.??
Check in the datasheet of the products. You should find somewhere online.
Or trace the voltage supply pins of the chip to the outer pins (in case of the shield) and voila you know from which pin it gets the voltage, and so you know what the input voltage is.
