What type of controller to use to drive these motors?

[Josie05]

Hello,
I found some second-hand stepper motors on the roadside at my local electronics market.
Here is what I know about these motors:
1. NEMA 17
2. Bipolar 2-phase (4-wire)
3. Coil resistance 2.1 ohms.

Now, from Ohm's law, if I assume it's rated for ~1.5A (which I think is standard for this type of motor), then the rated voltage is ~3.15v (2.1*1.5).
I know I have to use a constant current chopper controller, which reduces the voltage in steady state and increases it when running.
The question is what controller can I safely use to drive these motors. Is the DRV8825 available as an option? If yes, what power supply should I use to control it? Can I use a benchtop SMPS?
Also, I have a L293d shield. Can I at least use this shield to power the motor and get it to work? Can I do this by putting a small high power resistor in series with the motor coil?

 

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