Power supply transformer advice
Tim Wescott wrote:
.... 1100 watt defunct microwaves can be had for the asking.
They have a particular transformer core design that makes it easy
to saw off the 1 KV secondary, and with the
generous core window, you
could wind 18 to 20 turns of wire good for 10 amps. The turns per volt
is not much over 1 tpv.... And you have a decent rectifier diode for
the spares box too....
Admitted - a bandsaw in the workshop makes a 15 minute job out of this
transformer hack.(if you don't nick the primary)
Brian W
KA5WOG
Brian, I have done this with old uwave transformers, the ones I could
knock out the magnetic shunt with a hammer and punch, but on the newer
ovens the shunt is a weld. Will these still work?
Jimmie
I left the magnetic bypass leg in the core on the one I used for a spot
weld source. Its a security blanket against core saturation due to the
magnetron,I reckon.
Brian W
I _think_ that shunt serves to limit the secondary current and therefore
protect the magnetron.
I agree....
Brian W
|