Muller Dynamo

[xenomorphlabs]

Hi Staffman

I have ordered the stuff Romero quoted

7 X 0.125MM SOLDERABLE STRAND EN.Cu = 0.875mm
Ref: ST01250007-500

So he does seem to state it is 0.875mm overall.

Thanks mate

Cheers

Sean.

Romero has made a calculation mistake as has been pointed out several times in this thread. But if you got thicker wire it will yield more current.
You might wanna re-calculate your coil dimensions though with 0.375mm instead of 0.875mm  though before you start to wind if you got 7 strands of 0.125mm wire.

[toranarod]

what was the over all size of the wound coil?
if his wire is thicker you cannot get 300 turns in that space. this is the size? can this be confirmed?

 

[toranarod]

what was the over all size of the wound coil?
if his wire is thicker you cannot get 300 turns in that space. this is the size? can this be confirmed?

the thing is all the coils are in parallel.

[k4zep]

the thing is all the coils are in parallel.

No, not in parallel, all the output pairs are in series, then full wave rectified then paralleled into the 47,000 Cap.
So you have two coils/pair in series in boost configuration, rectified,  output of all rectifiers into one Cap.  A very important difference.
Look at the schematics posted earlier on the list.

Respectfully
Ben K4ZEP

[e2matrix]

Hi Staffman

I have ordered the stuff Romero quoted

7 X 0.125MM SOLDERABLE STRAND EN.Cu = 0.875mm
Ref: ST01250007-500

So he does seem to state it is 0.875mm overall.

Thanks mate

Cheers

Sean.

Sean, great to see you on this rep also.  The 0.875 mm mentioned is I'm sure a type that should be 0.375 mm the 3 and 8 looking a lot alike if in a hurry.  I'm not sure if this type originated from the site Romero got his wire from originally or if it was something he copied by mistake but quite a way back in this thread you can find enough refernces on the guage of the individual Litz wires and total wire guage size to be fairly certain that it was intended to be 0.375 mm overall which is close to 26 guage wire.  Otherwise it would be closer to 20 guage which is quite thick and I seriously doubt you'd get 300 turns of that on those bobbin size spools.  I've pointed this error out a number of times and someone even posted a diagram verifying that it would be 0.375 mm but the error continues to slip in since it was never edited in the initial posts and I think it even was in the PDF Stefan did.  Any doubts just think for a minute of seven 0.125 mm wires arranged in a circle (viewed from end) and you'll see there is no way the diameter would be anywhere close to 0.875 mm as you basically have 3 x 0.125 mm maximum across the diameter at any point. 

          OO
         OOO
          OO

  Ah Geezzzz if I had read to the end of this thread I'd have seen xenomorphlabs beat me to it ...   LOL