FWIW
If you take a cheap digital analog clock, remove the battery,
connect to the two coil connections, you can drive the clock with a 
0.5 Hz square wave through the series combination of a capacitor and resistor.
Typical values are 100mfd and 200 ohms.
You need to select these values to get certain stepping without pole-ing.
The clock originally used 1.2 volt pulses, alternate polarity about 20 mS long.
You can trade off these values and still get smooth certain operation.
Cheers,
Neville Michie
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