>> 50% duty cycle is way overkill, perhaps even harmful. In the >> 'scope traces below you can see the IC generates just 50 ms >> biphase pulses every second. That's 1/20, or 5% duty cycle. > > No Tom, you misunderstand. The 50% duty cycle pulse provides the > rising and falling edges. The small capacitor differentiates > that to produce a positive going, or a negative going pulse to > make the motor move. > > -Chuck Harris
Ah, I see now. It's a 0.5 Hz square wave. Cool. Yes, that looks like it might work. Has someone tried this on a quartz clock stepper motor to make sure you reliably get sufficient impulse? I wonder why no commercial clocks use this trick. /tvb _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
