I am building a Mearm robot using an Arduino to control it. The kit came with 4 servos which are rated at 5v. The Arduino doesn't output enough power to power all 4 servos so it suggests buying an external power supply.
I did this, my power supply outputs 5v and when I measure on my ohmmeter it says it's outputting 3.3 amps. The problem is I connect the live and ground servo wires to the positive and negative pins on the power supply and the control wire to the Arduino and nothing happens apart from a very small sound from the servo. I think I also blew one up trying this as now it doesn't even work from the Arduino.
They all worked perfectly when powered from the Arduino which output5 5v also, but only 0.3 amps when I measured it. I thought the current didn't matter if the voltage was correct? Am I blowing them up because of too much current?