Quote from: OilBarren on April 11, 2008, 11:37:14 AM
ALSO WHAT IS IMPORTANT TO US IS THE VOLTAGE IS SELF-REGULATED AND DOES NOT COLAPSE ACROSS THE LOAD (2.9 VOLTS) WHEN THE LOAD IS CHANGED (AND NOT AIDED ) BY THE PRIMARY.

I have tried to make out all the meter reading from the photos.  What I see is that between 100 ohms and 10 ohms load the input power stays fairly constant at around 1 Watt whereas the output power varies from about 0.1 Watts to 0.4 Watts.

What you have is a transformer that maintains a constant input power over a wide range of output power.  You have successfully isolated the primary from the secondaries, and this may have some practical use, but so far it comes at a high cost: the output power is considerably less than the input power.

I modified Post #1610 to include the chart data for the bi-toroid. I did it at home with slightly different software, so they're not perfectly aligned, but still suitable for comparison. I didn't bother with the efficiencies because the volts out were not completely readable in most cases, but it has been noted that the efficiencies are not high at this time.

Here is a close up of the new bi-toroid:

Quote from: aether22 on April 11, 2008, 07:23:57 AM

Again if you could drop a line or 2 on how you wound your coils, by hand? or with some motorized setup? (winding by hand tends to twist and break wire)

Hi aether22,

I wind my cores by drilling the core size in a small piece of wood, not completely thru, then drilling a smaller hole size in the wood to insert a shorten nail. The nail is inserted into my variable speed drill chuck. The predrilled wood is attached to the core with tape. The other side is the same setup, but the nail is just inserted into whatever long hole is available. Start off slow and just hand move the wire slowly back and forth. A lot of wire can be loaded in a short time. I use 28 guage wire and don't have any twist or breaks just pulling off the top edge of a large spool sitting on the floor. LIke putting line on a spinning reel.

Good Luck,
Larry

Quote from: JustMe on April 11, 2008, 11:35:04 PM
I modified Post #1610 to include the chart data for the bi-toroid. I did it at home with slightly different software, so they're not perfectly aligned, but still suitable for comparison. I didn't bother with the efficiencies because the volts out were not completely readable in most cases, but it has been noted that the efficiencies are not high at this time.

Here is a close up of the new bi-toroid:

@Thane,

Is your new secondary core coiled soft steel? Does the clamp make a difference in performance? I noticed a large vibration in my bi-rectangular version, does the clamp improve the output?

Thanks,
Larry

Quote from: PerpetualLurker on April 11, 2008, 04:20:11 PM

Quote from: OilBarren on April 11, 2008, 01:05:35 PM
VERY NICE JM - IT IT POSSIBLE TO GET THE SAME TABLE FOR THE BI-TOROID?

I agree, the table is very good.

I noticed in the photo that you appear to be using an Ohmite Ohm Ranger resistance box to select different loads.  If that's the case and it's a model 3420, you should be aware that its power rating is only 1/2 watt.  You will overheat and likely damage one or more resistors in the box if you exceed that rating for a sufficient length of time.

Wow, how fortunate, this thread has recently loss a Electronic equipment tester expert somewhere in the world, maybe Germany! Now you appear to help up in our blackest hour. Thanks, as Thane doesn't know anything about watt's or snot's or maybe Shots (doubt that), can't remember got bad CRS.