Hi,
I built a 5 filar along Tom C.'s guidelines and it's running now, but I don't know what the specs should be on it, i.e., is it running well or not.
The coil is 5 files all 150' long, 4 are 18 gauge and 1 is 19 gauge. It's a 3" spool with 3/4" hole and r60 rods. The coil is not litzed.
Diodes, transistors and resistors are all matched. It's a 20.5" wheel with 18 magnets, free spin time is 17.5 minutes. I'm charging a lawn and garden battery, with another as the primary.
I started with a g of w bulb and 100 ohm resistors, but even with 0 ohms on the pot the rpms maxed out at 120 and I would get about 6 triggers per pass. So I replaced the resistors with 10 ohm ones and the rpms came up to 125. Then I jumped the g of w with a screwdriver and the rpms shot up to 295.
So I took out the g of w bulb and left in the 10 ohm resistors and tuned it using the pot. I found to get a decent h wave with no extra triggering I needed a maximum of 125 ohms on the pot, plus the 10 ohm resistors, and it would draw around .670a from the primary and charge maybe .330.
I tried John K.'s method to tune it where you slowly decrease the resistance as the rpms increase, until the rpms then start to drop, and then go back and increase the resistance a little again.
So I came out with 80 ohms on the pot with a draw from the primary of 1.3 amps and .665a charging. Rpms are 308. It seems to be charging ok, the charging battery is at 14.23v at the moment. Here's a couple of pics of what I've got.
![Click image for larger version
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ID: 50849](filedata/fetch?id=50849&d=1348681545)
![Click image for larger version
Name: Board.jpg
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![Click image for larger version
Name: Trace.jpg
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My question is does this sound reasonable for this build? I haven't seen specs on what a 5 filar should be doing so would appreciate some feedback.
Also, on the trace shot, the 4th h from the right has a spike of around 500 volts, when normally they are around 300 volts. I see on the scope it gets extra high spikes here and there and am wondering what causes this and if this is undesireable or not??
thanks,
Robert
I built a 5 filar along Tom C.'s guidelines and it's running now, but I don't know what the specs should be on it, i.e., is it running well or not.
The coil is 5 files all 150' long, 4 are 18 gauge and 1 is 19 gauge. It's a 3" spool with 3/4" hole and r60 rods. The coil is not litzed.
Diodes, transistors and resistors are all matched. It's a 20.5" wheel with 18 magnets, free spin time is 17.5 minutes. I'm charging a lawn and garden battery, with another as the primary.
I started with a g of w bulb and 100 ohm resistors, but even with 0 ohms on the pot the rpms maxed out at 120 and I would get about 6 triggers per pass. So I replaced the resistors with 10 ohm ones and the rpms came up to 125. Then I jumped the g of w with a screwdriver and the rpms shot up to 295.
So I took out the g of w bulb and left in the 10 ohm resistors and tuned it using the pot. I found to get a decent h wave with no extra triggering I needed a maximum of 125 ohms on the pot, plus the 10 ohm resistors, and it would draw around .670a from the primary and charge maybe .330.
I tried John K.'s method to tune it where you slowly decrease the resistance as the rpms increase, until the rpms then start to drop, and then go back and increase the resistance a little again.
So I came out with 80 ohms on the pot with a draw from the primary of 1.3 amps and .665a charging. Rpms are 308. It seems to be charging ok, the charging battery is at 14.23v at the moment. Here's a couple of pics of what I've got.
My question is does this sound reasonable for this build? I haven't seen specs on what a 5 filar should be doing so would appreciate some feedback.
Also, on the trace shot, the 4th h from the right has a spike of around 500 volts, when normally they are around 300 volts. I see on the scope it gets extra high spikes here and there and am wondering what causes this and if this is undesireable or not??
thanks,
Robert
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