Re: High Tank Circuit Q
On the balanced tank circuit,
> ......You remarked on the notable improvement in your
> test setup when you used the balanced Tesla tank circuit....
> ....This circuit is the highest performance Tesla tank circuit
> I have encountered.....
I didn't mean that I noticed a marked improvement on my balanced set-up vs my unbalanced set-up.
What I was talking about was the total capacitance in the system. (I'll get back to this in a
moment) As far as my balanced circuit goes, it is the better circuit to run. I agree,
wholeheartedly. The differences I noticed on the balanced circuit is that the sparks are more
aggressive (forky). As far as the spark length goes, I noticed about a 10% gain in spark length
in the balanced circuit. The tuning is much sharper in my balanced circuit too. I do expect
these differences to become more marked when I get the pole transformer set-up complete.
What I had mentioned on the phone was the difference between using .025 uf and .0125 uF in the
tank circuit, both in an unbalanced configuration. I noticed the tone of the sound of the spark
gaps was half the pitch with the .025 uF. There was also a much lower output in spark. When I
talked to you, I attributed this to the charging time constant of the greater capacitance. In
short, the tank circuit was being pulsed half as often. So, the output was much less. Then I
later realized what I believe to be the truth. I had forgotten one very important factor,
It would still be true that the pulsing would be half as many with twice the capacitance. But,
with twice the capacitance I should get twice as many Joules per pulse. The problem is that I
didn't have enough current available for the greater capacitance. The 15,000 VAC -at- 90 mA is fine
for .0125 Uf, but it is about half of the current needed for .025 uF, at 15,000 VAC. I had
made an oversight on the basics of matching the tranformer to the capacitor. Don't I feel like
the fool! :-/
> I am not surprised that Scott was able to hit four foot sparks at
> 1300 watts (neons are remarkably close to their plate ratings in
> output, if the system sucks more RMS juice out of the wall it is
> because it is not power factor corrected) using this circuit with
> two of the Condenser Products capacitors. It just goes to show
> that Scott watched me setting up the 10" coil on the video and
> tried the same experiment scaled down a bit.
> BTW Scott, I didn't know you were getting two of those caps. You
> dog! Having 23 caps to choose from I am all but sure that you
> measured every one and picked yourself out a perfectly matched
> pair! (I would have done the same thing |-)
You're right. I did start to measure the capacitance of each one to pick a matched pair. But,
after measuring 4 units, I found that they were all very close. It seemed that I could use any 2
for a matched pair. Since I didn't really want to unpack each one, I called Condenser Products.
They checked their test data, and found all of them are close, within a couple hundred
picofarads or so of each other. So I took the first 2 I had unpacked, since my meter said they
were identical. They work great in a balanced configuration (obviously).
By the way, I have three of them. It is a strange story. Condenser Products called me after I
received them and wanted me to ship one to another of their customers. So I did. After it was
all said and done, I ended up with a third free one. Lucky me. :-) I may sell it. I haven't
decided yet. Please guys, don't bomabard me with requests for it. I already have a few people
that have asked.