Hi! i could use successfully a motor using a positive supply with a diode and a TIP120 transistor and arduino. But now i have a new challenge, to run the motor using negative supply GND and -9v, because my knowledge of electronics is limited a dont know what transistor will do the trick. Im sure its something easy but i cant find anything searching.
thanks in advance.
Use the P.S. GND terminal as the positive voltage and the "negative" output as "Gnd" (Arduino Gnd.)
[ My assumption is you have some supply that has its output terminals labelled "GND" and "?V". ]
thanks a lot, i will try that configuration using the same transistor , i hope not to do anything wrong.
First check if the supply has isolated outputs - if its ground really is ground you cannot
do this.
my circuit have +9 , gnd and -9, so the power supply is just one. i cant use the +9 supply for design specs, so...any way to do this?
Derok:
i cant use the +9 supply for design specs,
Does that mean that you cannot use the =9V section of the supply at all?
"Powering (a) motor." Does that mean simply ON and OFF?
Derok:
so...any way to do this?
You could place the motor between -9V and GND easily using a relay.
A simple relay circuit shouldn't be any great burden on the +9 section.
The relay contacts would switch the "-9V" to the motor.
You are right in all...yes on and off. Great idea!! i should think about it before. Tons of thanks!