22 Sep
2005
22 Sep
'05
7:57 a.m.
On 9/21/2005, der Mouse wrote:
Indeed, you can do something autotransformerish with
only two
transformers:
---------------------.
IN |
--------+------------|-------------------------------
| +----+ OUT
| | | +-------------
| | | |
|_()()()()()_| |_()()()()()_|
========================
...or just one, if you can find a "universal" 120/240 volt transformer of
sufficient VA rating (the secondary is NC, so the secondary voltage doesn't matter).
I'm not as artistic, so I'll borrow the artwork and just add a couple of lines.
The "split bobbin" types are fairly common, even in 220 vac countries, as it
lets a manufacturer change the nameplate voltage of a linear power supply with just a
change of jumper and fuse.