I'm building PS to be used with 240V AC. However, the only transformers I have at my disposal are the ones specified for 120V. Can I use 2 transformers with their primaries in series and effectively used with 240V supply? Is it the same as using ea. transformer with 120V supply or am I missing something here?
Linguistic battles aside...
Yes
I missed it too...
http://www.diyaudio.com/forums/showthread.php?s=&threadid=9398
Great little idea about the auto (tranny, trafo, whatever)...
Yes
I missed it too...
http://www.diyaudio.com/forums/showthread.php?s=&threadid=9398
Great little idea about the auto (tranny, trafo, whatever)...
AudioFreak said:That'll be fine Peter.
Yeah but if you have varying loads on the two transformers you will have problems.
I am currently running the PM 665 with the two transformers in series. I will put in the auto transformer anyway as I don't want to blow anything to bits, ever...
sangram said:Yeah but if you have varying loads on the two transformers you will have problems.
True. I should have said.. As long as the total VA being drawn off the secondary side of each transformer is equal, it'll be fine.
To achieve that, assuming that both transformers are near to identical, you could run the secondaries of each transformer in parallel. ie. secondary winding #1 on transformer #1 in parallel with secondary winding #1 on transformer #2 and secondary winding #2 on transformer #1 in parallel with secondary winding #2 on transformer #2.
240v trannies
Peter,
It should work, but if the trannies are not completely identical (and half a winding secondary may be enough) you will connect in parallel two unequal voltage sources which will cause a relatively high circulating current heating up the tranny for no reason and robbing you of available power.
I would advice to check the loaded output of each secondary and if there is more than a few hundred mV difference, if that is an option, to use each secondary for one polarity of the supply.
Jan Didden
PS I forgot, but I had a similar case where I added one turn to one tranny to get them equal. May also be possible.
Peter,
It should work, but if the trannies are not completely identical (and half a winding secondary may be enough) you will connect in parallel two unequal voltage sources which will cause a relatively high circulating current heating up the tranny for no reason and robbing you of available power.
I would advice to check the loaded output of each secondary and if there is more than a few hundred mV difference, if that is an option, to use each secondary for one polarity of the supply.
Jan Didden
PS I forgot, but I had a similar case where I added one turn to one tranny to get them equal. May also be possible.
Blumlein
I see Blumlein is also your hero. What a loss!
blmn said:You have to be aware of the secondaries phases, of course.
I see Blumlein is also your hero. What a loss!
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