You could also
use a transformer with 2 separate 17V windings (they're
more common than tapped ones in the UK). You'd link that up like this :
Mains
In 17V PC-jr power input
---------)||(--------------------( 1
)||(
)||(---+
110V )|| 0V +----------------( 2
)|| 17V|
)||(---+
)||(
---------)||(--------------------( 3
Mains 0V
In
Notice the secondary connections put the 2 windings in (additive) series.
That
works. BUT, you need to watch the direction of phase on those
paralleled transformers in secondaries and tied together
primaries. Watch the wattage rating. :)
That's why I put the 0V and 17V markings on the schematic. In the UK, it's
conventional to mark the 'start' of a winding with 0V and the 'end' with
the appropriate voltage.
Jason D.
--
-tony
ard12(a)eng.cam.ac.uk
The gates in my computer are AND,OR and NOT, not Bill