6 volts is too much for the 5 volt pin and not enough for the 9 volt pin (this needs at least seven volts). You either need a higher voltage DC power source or a 5v dc regulated supply.
6 volts is too much for the 5 volt pin and not enough for the 9 volt pin (this needs at least seven volts). You either need a higher voltage DC power source or a 5v dc regulated supply.