I have found that old variacs are good for easily winding my own filament
transformers.
Larger ones are about 2 turns per volt and if you have a damaged one, just
remove the
hardware, if there are a few burnt turns just cut and unwind them and reconnect
the
good parts. I usually then wound some high temp insulating tape around the core
and
wind my secondary over that.
If you space the secondary some distance off the primary you will have a low
capacitance transformer to provide some isolation for grounded grid operation
in some
cases if you need really high voltage isolation.
73
Bill wa4lav
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|