Put a 4k7 resistor one end to the base, the other end has a other 4K7 to the +ve and is also connected to the output of the ULN2803.
Values are not critical.
Put a 4k7 resistor one end to the base, the other end has a other 4K7 to the +ve and is also connected to the output of the ULN2803.
Values are not critical.