[time-nuts] Local Solar Time Clock

[Jim Lux]

On 1/19/14 9:17 AM, Chuck Harris wrote:
> The usual quartz clock that runs off of a AA cell is a little
> trickier to drive than you might think.  You need to feed
> its stepper motor coil with an alternating +1.5V and -1.5V pulse.
> The pulse follows the rising or trailing edge of a 1/2 Hz square
> wave.  I have driven them using a series capacitor and resistor
> to ground...arranged as a differentiator, but I don't recall the
> part values anymore.
>
> You arduino could certainly be made to generate such a pulse using
> a couple of resistors and a couple of digital outputs in a simple
> DAC sort of circuit.
>

Yeah.. that *is* the challenge.
  Use two outputs and make a sort of "H bridge"