5 filar specs

[Forrest]

Hi Robert, Looks like you are doing quite well there. Construction looks good and you will like the output from this setup for sure. You should have absolutely no problem charging those batteries. The next step is doing the 20 runs and carefully looking at the data on the charging time vs the discharge time. I know this work is tedious and long but what else do you have to while things are running along. Build a bigger and better one!

Nice Job! Keep up the good work!

Bud

[Tom C]

faster charging, more power windings more transistors, bigger circuit, charges bigger batteries.

Tom C

[Mike Swanson]

Just wondering what is the advantage of the 5 filar coil? (Pentifilar? )

Thanks,

Mike

[Robert Darrah]

Hi John,

Ok, great, thanks John. I'll start on the testing. So while I'm watching it spin another million miles, what do you suggest would be a good next project to work on?

Howard,

Succumb? Who me? I think that was the other guy... Actually, I just give it a gentle spin by hand with the charging battery disconnected, just enough to see them blink a couple of times. But yes, you're right, with the 5 filar I need to be more careful than with the vanilla girl.

thanks,

Robert

[Howard Wetsman]

Robert,
The same thing happens with my digital scope. I think it's just as John K says. If you do the runs and get good results you'll know you're getting the spikes. Don't succumb to the temptation of disconnecting the charge battery just to see "if the neons light up."
h

[John_Koorn]

Robert, that looks perfect and what I'd expect to see for that type of build. The random height spikes are because the scope can't catch them all quick enough, nothing to worry about.

All you need to do now to test your setup is do charge/discharge cycles and record your data.

Good build, great work!

John K.

[Robert Darrah]

Hi Howard,

They call it a 7" scope, but that's the diagonal measurement. The screen is 3.5" high and 6" wide. I don't know if that's considered small or not, as it's the only scope I've ever used.

It shows the spikes all around 300, but then one spikes high over here on the screen, and then another over there and so on, so it happens randomly around the screen. When I put both probes on different transistors so I have 2 waves displayed, one above the other, I'll get spikes in the same places at the same time on both waves.

I dunno, just curious as to what's going on, if it's because it's a digital scope, or if the spikes are really there, then why are they random and what this may do to the machine's efficiency...

Cheers,

Robert

[Howard Wetsman]

By the way, nice build
h

[Howard Wetsman]

Robert,
Is that a small digital scope? I used one that gave me spurious readings on the v-v difference with the spikes (much higher than reality) and also just didn't show all the spikes of all the waves so it looked like spikes only happened once in a while. On a bigger scope it looked very different. Just a thought.
Howard

[Robert Darrah]

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.



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