RE: [TCML] Advice on MMC-Choke

["andrew" <andrew@xxxxxxxxxxxxxxxxxxxxx>]

Thanks Deano

An interesting project. 
I might give it a try.
Cheers

Andrew


> I don't have a variac but am keeping my eye out for one of suitable rating
> but there are not many for sale around here.
> 
> I like the idea of building a variable reator with iron wire in a tube but
> not quite sure how to do that.
That is a great solution, I have not built one myself. If you have an extra
MOT, 
I have built a rough and ready ballast, adjustable and reasonably linear.
Not 
adjustable "on the fly", but easy to make. It would be easier for you as
your 
MOTs are already 240V.

I cut the welds holding the I to the E and removed the secondary and shunts.

Added another primary from another MOT with same size core. Rigged clamp to
hold 
I on E, put plastic shims between I and E and clamped tightly. Works like a 
charm. 

You only need one MOT and do not have to add a second primary.

I really wanted better linearity, so ended up splicing the two cores
together 
side by side "double wide core" and winding my own coil to get a straight
line 
from 0 to 240 V input. Saturation starts at 240 instead of 180 and is just a
bit 
off the line at 260. 

No pictures, no text, only graphs at:
http://deanostoybox.com/projects/ballast/

later
deano

 

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