Hi,
If you have a mains transformer with two primaries and you connect them in parallel but in anti-phase, do you get a big bang or do the EMF's simply cancel and you get nothing? I've been wondering this for years but never experimented.
Thanks.
connecting primaries
May 27, 2005
6 Replies
Just to clarify, I'm talking about converting equipment from 240v to 110v and wiring the TX wrong.
In response to what Gareth Magennis posted in news:d76ol7$2p0$ snipped-for-privacy@nwrdmz02.dmz.ncs.ea.ibs-infra.bt.com:
Lots of noise, and lots of smoke.
Joe Soap.
JUNK is stuff that you keep for 20 years,
then throw away a week before you need it.
Hi Joe, care to put me out of my misery and explain why?!
Thanks, Gareth.
In response to what Gareth Magennis posted in news:d76ucq$3dn$ snipped-for-privacy@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com:
Think of them as one primary, one secondary as a bifilar winding - no problem with them in parallel because there is a back EMF to oppose the driving voltage so only a little current. It's effectively a single winding. Reverse the connections, and there is no back EMF from the transformer core so lots of current.
Life is easier if you reply at the bottom not the top.
Joe Soap.
JUNK is stuff that you keep for 20 years,
then throw away a week before you need it.
Aha, that's what I was missing. Thanks.
Oh, and I disagree that bottom posting is preferable in al cases. Haven't you and every other reader of this post had to scroll down to the bottom to read my reply? ;)
Gareth.
Yes, that's something that happens when people fail to trim their replies.
Noah
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