drive higer load with the usb 6008

[lav21]

Hi all,

I need to drive a small motor with the analog output of the usb6008 device ... connecting it directly doesn't seem to work.

Any suggestions how get it working??? what does the 6008 output?

My motor works on a AAA battery dricetly.

Thanks a lot

[hrh1818]

On Apr 23, 12:40 am, lav21 <x...@no.email> wrote:
> Hi all,
> &nbsp;
> I need to drive a small motor with the analog output of the usb6008 device ... connecting it directly doesn't seem to work.
> &nbsp;
> Any suggestions how get it working??? what does the 6008 output?
> &nbsp;
> My motor works on a AAA battery dricetly.
> &nbsp;
> Thanks a lot

The analog outputs of the USB-6008 are only rated at 5 Milliamps per
channel. One suggestion for getting it to work is to use an emitter
follower to get more current to drive your motor.

Howard

[Matthew_Kelton]

If you're not trying to vary the voltage to the motor, then use one of the DO's and a transistor or relay to switch on and off an independent power source.  You may need to add a darlington driver if the relay draws too much current.

[lav21]

I do need to varry the voltage continiously.

Thanks a lot. Ill give it a try.

[hrh1818]

On Apr 24, 11:40 am, lav21 <x...@no.email> wrote:
> I do need to varry the voltage continiously.
> Thanks a lot. Ill give it a try.

Update Add a resistor in parallel with your DC motor. The size of the
resistor should be 10 to 20 times larger the resistance of your DC
motor. The resistor provides a path for the current generated by the
back emf of your motor when the input signal to the emitter follower
goes to zero.

Howard