I have some measurements to give you for the coils.
Using the above pictures as a referance the dementions are as followed.
The length of the large coils(left to right) 1.312 inches.
The width of the coils (top to bottom) 1.5 inches
The height of the coils(table up) 1.16 inches.
Coil base size measures .360 x .675 inches.
Length of small feedback coil (green) is.380 inches.
Wire size was 29 gauge .0115 inches.
My calculations for the primary wire is between 600-650 turns, wire resistance measured 10.5 ohms
Secondary 3000-3200 turns, wire resistance measured between 70-75 ohms between the three coils (2 chokes and secondary)
Now get busy
Don
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Quote from: Dynodon on 05 March 2011, 16:00:00
Kali'
Your way off with your turns.
Here's the resistance values that I took from the coils with a Fluke meter.
Primary-10.5 ohms
Secondary and chokes-70-75 ohms
Feedback-11.5 ohms
Now 29 gauge wire measures 81.83 ohms per 1000 feet,so I come up with the following
Primary- 128 feet
Secondary and chokes- 884 feet
As for number of turns I come up with
Primary - 600-650 turns
Secondary and chokes - 3000-3500 turns
Because they are hand wound and not precision,these should be very close.
As for the 220 ohm resister,they were wired across the primary to restrict the current feeding it.10.5 ohms will make the coil heat up with 12 volts feeding it.Some of the coil pacts had three resistors across the primary,all of them were 220 ohm.The largest one was a 5 watt.
Don
Quote from: Dynodon on 06 March 2011, 16:22:44
The 220 ohm resistors were like I said wired across the primary coil(parallel).A friend had talked with a coil manufacture,and they told him that 10.5 ohms coil would get hot,then he asked them what would happen if you were to wire a 220 ohm resistor across it,and he stated that it would run cooler.Not my words.
As for the NVR1550 diode,there is actually a MUR1550 and a MUR1560.The first is a 500 volt,and the second was a 600 volt.
Kali,as for your explaination of the voltage step up up 1:5 with 12 volts in and 60 volts out was a little confusing.But I believe I understand what you were getting at.
You are stating that if you apply 12 volts to the primary coil,with a step up ratio of 1:5 you will then get 60 volts out to the blocking diode.Now in my testing of my coils,I have a step up ratio of 1:10 or as I would put it 10:1.So if I apply 12 volts to my primary I should get 120 volts out of the secondary.Right?
Well when I test the output of my secondary without any load on it,I get a much greater step up than 10:1.I've seen several hundred volts.No just maybe that is what Stan is hoping for with his set up.Maybe because we are restricting amps with the choke coils that this high voltage from our secondary is able to stay high,because of the very low load.
Under normal step up coils we are appling loads to the secondary output which pulls the voltage down to the actual ratio of the steup.So just maybe with the chokes restricting the amps,we are able to keep this higher voltage than the stepup ratio produces.Maybe it has something to do with the coils all being on the same core that allows this greater voltage to be produce.
Now again with my coil set up,of 100 turns primary,1000 turns secondary,and 2000 turns chokes,I have seen between 1kv-2kv at the cell.It it hasn't had any ill effect on the blocking diode.And my diode is the same rating as a MUR1560.
Thats some of my thoughts on this matter as I have seen it with my own testing.
Don
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Quote from: TonyWoodside on 01 April 2011, 08:17:24
Primary : 450 turns, 10?, Air Inductance 1.43mH, Core Inductance 8.01mH
Feedback : 450 turns, 10?, Air Inductance 2.98mH, Core Inductance 10.4mH
Secondary : 3000 turns, 78.2?, Air Inductance 87.2mH, Core Inductance 358mH
L1 : 3000 turns, 75.9?, Air Inductance 83.1mH, Core Inductance 359mH
L2 : 3000 turns, 76.9?, Air Inductance 85.5mH, Core Inductance 359mH
So the secondary side total inductance is 1076mH
My testing coils are as follows:
Prim. 850uH 1ohm 200wnd AWG23 (100ohm series resistor) coil former 35mm length max.30mm height
Sec. 150mH 46ohm 2000wnd AWG30 coil former 35mm length max.30mm height
Pickup center tapped 2x 15mH 2x11ohm 2x500wnd AWG30 coil former 20mm length max.30mm height
Choke1 150mH 46ohm 2000wnd AWG30 coil former 35mm length max.30mm height
Choke2 150mH 46ohm 2000wnd AWG30 coil former 35mm length max.30mm height
core hole 10x8mm
Copper wire insulation should sustain 2k5Volt.
Inductance depends on core material used (measured values are without core)
Going to try ferrite core ( UU core )
My wfc cell is insulated in delrin. Wires are fully insulated.
It is 2Mega Ohms 1.8nF.
br,
Webmug
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The core is a Ferroxcube U core,the largest one they make.The legs are @ 3/4 inch in diameter.
The chokes are in the 10-11 Henries ech,very high.
So......as Don once said, go testing!
Steve
