[plug] Binary Clock

[Denis Brown]

At 17:03 30/01/2004 +0800, Mark J Gaynor wrote:

<snip>

>The problem now is the clock runs slow. They use the 60Hz AC as a cheap but
>
>accurate reference. At 50Hz it runs about 17% slow. For a talking point it
>is ok,
>but as a time piece, that sucks.

Well, all might not be lost, if you can gain access to the clock's innards 
:-)   Years ago I recall a divider chip that took the standard NTSC colour 
TV subcarrier crystal frequency and spat out a 60 or 50 Hz signal, jumper 
selectable.   Had inbuilt crystal oscillator circuit, you just added xtal, 
some caps and some volts.   Mike out at WorldWide Electronics might have 
the chips or know of them.  Or roll your own using a 32 KHz RTC or watch 
xtal and some cmos divider chips.

Errr... there's not a jumper in there somewhere to convert the divider 
chain to 50Hz operation?
Just a thought ;-)

Denis