Hey there, I just got my arduino and I'm all excited about it
As my first project I plan to power an old Siemens slave clock, it just requires the polarity to be reversed every 60 seconds.
I already prototyped a h-bridge which is currently just blinking 2 leds which are connected vice-verca (to check if the h-bridge works)
the slave clock requires a current of 12 v, but I don't know how to supply 12v (reversed every 60 seconds) as the arduino has no sufficient power-source ...
Well you could use the h-bridge and an external 12v supply and tie the grounds together. I'd only do this if the Siemens inputs are isolated from any AC.
If they are not then I'd suggest either an optoisolator driving the H-bridge or just get a relay and use one pair of contacts for +12 and one pair for -12.
It's very easy to drive a relay with the arduino and it will work whether the Siemens is isolated or not as it provides the isolation. A program to run it would be trivial to write.
