I am planning on making a master clock to run one of those old school clocks that ran off a 24VDC signal that was sent 1x a minute by a master clock. The clock mechanism draws about 200mA of current. I know that the chip is picky with its supply voltage so I'm wondering how much I need to "segregate" their power supplies or how best to do so. I was going to use a variation on the Arduino LED "hello world" program. I can use either a transistor to drive the clock or a relay. Opinions. The clock will be plugged in to AC line voltage in the USA. Thanks!
Here's some info on the clocks.
http://setclocks.zayre-electronics.com/
You could use a dual opamp. I copied the design from a professional slave clock driver. I just drive one slave clock so I used a low-power LM358 that I happened to have lying around. Two Arduino outputs go to the LM358, one for even and one for odd minutes. For power, use a 24V wall wart.
The manual, including the schematic, of the said professional slave clock driver can be found at: http://www.meinberg.de/download/docs/manuals/german/huc80e.pdf