Luciano...I've been spoiled! The disk shaped motor I used drew 30 mA at 3 volts DC. The unit it is going in is 1" x 2" and has very little battery capacity. Now some of the motors on Jameco draw 80 mA @ 1.3 volts. I figure I could PWM them with a 40% duty cycle, and effectively cut the average current by the same amount, but I'd like to skin that cat with a sharper knife. I looked on the Digikey webpage, and saw a 20 mm piezo "speaker". I wonder if it can't be driven in such a way as to provide quiet vibrational signalling without the EMF associated with the motors?