I bought a kit that had pre-wound primaries. I wound the secondary. This document describes this process:
http://quadesl.com/pdf/trans_inst.pdf
I did mine by hand but I understand there are winding machines.
http://quadesl.com/pdf/trans_inst.pdf
I did mine by hand but I understand there are winding machines.
A piccy here shows how I re-wound one. I took off the original secondary and wound on to suit.
Cheers
http://www.diyaudio.com/forums/showthread.php?s=&threadid=43331&perpage=10&pagenumber=8
Cheers
http://www.diyaudio.com/forums/showthread.php?s=&threadid=43331&perpage=10&pagenumber=8
Essentially a toroid winding machine works like this:
A split bobbin is passed through the toroid and closed.
The right amount of wire is then wound onto the bobbin, by spinning the bobbin through the toroid.
The wire is attached to the toroid.
The bobbin is spun again, winding wire onto the toroid, while unwinding from the bobbin.
The empty bobbin is opened and removed.
The whole process is pretty cunning.
A pic of the bobbin/toroid arrangement (thanks to POVRAY!)->
A split bobbin is passed through the toroid and closed.
The right amount of wire is then wound onto the bobbin, by spinning the bobbin through the toroid.
The wire is attached to the toroid.
The bobbin is spun again, winding wire onto the toroid, while unwinding from the bobbin.
The empty bobbin is opened and removed.
The whole process is pretty cunning.
A pic of the bobbin/toroid arrangement (thanks to POVRAY!)->
Attachments
For a hand wound toroid a wire shuttle might be easier than the bobbin. A shuttle is a flat piece of stock that you wind the wire onto. Kite string is sometimes wound onto something like a shuttle. The idea is that it will easily pass through the toroid center hole allowing you to wind easily. Just make sure the shuttle can't damage the enamel on the wire.
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