ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hi:Does anyone know how to convert a 220V beolink 7000 charger to 110?Thanks,
Derek
New charger or new transformer, I'm afraid. I seem to recall the transformer has only a single primary winding.
(I deleted the duplicate thread)
--mika
It has dual primaries.
Can I just put them in parallel?
Hmm... If they are now in series, I guess so (after giving a good thought over which way they should connect!).
Funny that the service manual doesn't show that all. Wouldn't be the first discrepancy between those and the real life, though. I might open mine to take a look, but can't do it tonight.
Hi Mika:Would you be so kind as to do so when you have some free time?Thanks!
Here is it... take it with a grain of salt especially if your part numbers don't match, I don't take any responsibility, etc.
There are indeed two primary (110V) and two secondary (7-8V?) windings and both are connected in series in this 220V model. I've marked the polarities of the primary windings with the yellow dot. To convert this model to 110V, I'd rewire the primaries so that the dotted ends are connected together to incoming mains neutral, and the non-dotted ends together to the mains fuse.
To be sure, I think I'd disconnect the secondaries, feed some lower voltage into the mains input (say, 12 V~) and see if the secondaries still output a proportionally correct voltage (700 to 800 mV~ in this case). At least verify the output voltage of the entire charger (9-10 VDC) before placing your Beolink on it
Thank you for going to the trouble. Much appreciated.
How did you figure out the polartiy on the transformer?Derek
auric:How did you figure out the polartiy on the transformer?
Just by how the windings are connected - if one of the windings went the other way from how I marked it, the magnetic fields would cancel each other and there'd be no output on the secondary. When they are connected in series, the second winding needs to carry on in the same direction the first one did.
Also, they are often brought out like that in other transformers as well. I guess it is some manufacturing issue.