Thane Heins Perepiteia.

[Groundloop]

Thane,

Threading coils on toroids is not so bad. It is the removing of coils from toroid cores that is slow. 
I use a round wood stick and just wind up a lot of magnet wire onto the stick. Then I just thread the
wood stick through the core while counting turns.

Stefan,

Yes, I have a 2 channel O-scope. But I do not have a signal generator. That's way I made the oscillator.
The egg shaped coil has two bi-filar windings because the oscillator needs a trigger winding to run the
power winding. I use thinner wire for the trigger winding and when the oscillator runs I know that I have
the correct wires connected. So the oscillator with the bi_filar coil is my input power to the iron powder core.
Most easy way to connect the two output coils in parallel is just to run the oscillator and then measure
the voltage on one of the output coils. Then you connect the other in parallel. If the voltage drops then reverse
the wires.

Cutting Iron wires now.....................

Groundloop.


[EDIT]
Testing Thane coil with soft Iron input core.

Test 1, Low input wattage.

Input: 12,00 V 0,06 A = 0,72 Watt.

Out: 470R 0,694VAC = 0,0010 Watt


Test 2, High Input Wattage.

Input: 30,00 V 0,13A = 3,9 Watt.

Out: 470R 1,47VAC = 0,0046 Watt.

----------------------------------------------
All resistors below this line is 1% metallfilm.

Test 3, High Input Wattage.

Input: 30,00 V 0,13A = 3,9 Watt.

Out: 820R 3,80VAC = 0,017 Watt.


Test 4, High Input Wattage.

Input: 30,00 V 0,13A = 3,9 Watt.

Out: 2K2 11,84VAC = 0,064 Watt.


Added more soft iron to input core.
(Input core now full.)

Test 5, Low Input Wattage.

Input: 30,00 V 0,01A = 0,3 Watt.

Out: 2K2 1,40VAC = 0,00089 Watt.

Test 6, High Input Wattage.

Input: 30,00 V 0,12A = 3,6 Watt.

Out: 2K2 12,20VAC = 0,068 Watt.

Groundloop.

[aether22]

This time current me is in Green old me is in red and Thane in classic stylish Black

Edit; colours now as advertised ;)

Dear aether22,

I never measured current only voltage across the load.
All I wanted to focus on was an increase in voltage across the load with an increase in secondary turns ââ,¬â€œ with NO increase in primary power.

Groundloops results are not complete from my perspective yet?

I find some of your questions to be ambiguous ââ,¬â€œ so I need you to be a little more specific please?

ââ,¬Å"did you at least notice the signs of significant current when the coils were shorted?ââ,¬Â

If I am assuming PRIMARY CURRENT here with this question ââ,¬â€œ the answer is NO.
A good way to test the ââ,¬Å"isolatedââ,¬Â primary is to short out both secondaries.

I know the primary showed no load when the secondaries were shorted, that wasn't my question.

No, the question was in regard to the current in the secondaries when being similtaniously shorted.
I don't know how you measured the 170 (or whatever it was) volts, open circuit or over a ?ohm load, but if it was measured say over 1Kohm for example did you see if you got the same voltage over a 500ohm load? (which would imply the current has just doubled)

And if you shorted the secondaries at 170v there ought to be a decent level of current induced in them, heat and humming/vibration should be expected along with possibly destroying the transformer.
While obviously the latter didn't occur were there any signs that when shorted they were pulling significant amps?

[hartiberlin]

Thane,

Threading coils on toroids is not so bad. It is the removing of coils from toroid cores that is slow. 
I use a round wood stick and just wind up a lot of magnet wire onto the stick. Then I just thread the
wood stick through the core while counting turns.

Stefan,

Yes, I have a 2 channel O-scope. But I do not have a signal generator. That's way I made the oscillator.
The egg shaped coil has two bi-filar windings because the oscillator needs a trigger winding to run the
power winding. I use thinner wire for the trigger winding and when the oscillator runs I know that I have
the correct wires connected. So the oscillator with the bi_filar coil is my input power to the iron powder core.
Most easy way to connect the two output coils in parallel is just to run the oscillator and then measure
the voltage on one of the output coils. Then you connect the other in parallel. If the voltage drops then reverse
the wires.

Cutting Iron wires now.....................

Groundloop.


[EDIT]
Testing Thane coil with soft Iron input core.

Test 1, Low input wattage.

Input: 12,00 V 0,06 A = 0,72 Watt.

Out: 470R 0,694VAC = 0,0010 Watt


Test 2, High Input Wattage.

Input: 30,00 V 0,13A = 3,9 Watt.

Out: 470R 1,47VAC = 0,0046 Watt.

----------------------------------------------
All resistors below this line is 1% metallfilm.

Test 3, High Input Wattage.

Input: 30,00 V 0,13A = 3,9 Watt.

Out: 820R 3,80VAC = 0,017 Watt.


Test 4, High Input Wattage.

Input: 30,00 V 0,13A = 3,9 Watt.

Out: 2K2 11,84VAC = 0,064 Watt.


Added more soft iron to input core.
(Input core now full.)

Test 5, Low Input Wattage.

Input: 30,00 V 0,01A = 0,3 Watt.

Out: 2K2 1,40VAC = 0,00089 Watt.

Test 6, High Input Wattage.

Input: 30,00 V 0,12A = 3,6 Watt.

Out: 2K2 12,20VAC = 0,068 Watt.

Groundloop.

Hi Groundloop,
ah I see, you use your oscillator...

Maybe this is not a good idea.

Better for now use a Transformer powered from the grid,
so you run it first only on 60/ 50 Hz for which the core is more optimized...

So use a 110 / 240 Volts  to 12 Volts transformer for instance and use the
12 Volts AC output to drive your input coil.

This way it is much easier to setup and you can be sure,
that your oscillator circuit is not jammed by any output coil
setup.

At which frequencies did you do the above tests ?
Maybe it were in the Khz range, where the
core does not respond anymore ?

Many thanks.

[Groundloop]

Stefan,

The powder Iron core I'm using is good for DC to 1MHz. See the attached pdf document.
My oscillator is running at 14,3 KHz. This is within the cores ability to handle the frequency.

Groundloop.

[EDIT]  I did solder a 2,2uF capacitor across the oscillator coil. The frequency dropped to 2,2KHz.

Input: 30V @ 0,22A = 6,6 Watt.

Output into 2K2 Ohm: 14,28VAC = 0,093 Watt.

Groundloop.

[aethernut]

Has anybody thought about using bifilar winding? 
See "A Special Case of Voltage Gain" at http://home.comcast.net/%7Eonichelson/VOLTGN.pdf
I realize that this would be a big do-over so how about some comments on the theory?