Eldarion and Bruce's build of Bob's Energy Converter

[Bruce_TPU]

Hello All,

Another 2 hrs. and the bottom winding is wound.  This was wound CW, *NOT* CCW, because when flipped, the CW will become CCW.  It was wound from the inside core to the outside perimeter CW at 29 turns.   More wax on the core, before starting, made the task a bit easier.  Next is the difficult part... the inner core winding!   

I think I will use Wer's idea of the spray adhesive, along with bee's wax to make it work.  My bees wax is in small little chips, making smearing it on, rather easy.

After each winding, that individual winding is taped.  When all windings are completed, I will tape the entire core.  And then it will be time for the secondary.

I also included a picture of the sunset over the Gulf of Mexico, taken Thursday evening, aboard a ship, simply because it was so beautiful and I thought some would enjoy it!

Cheers,
Bruce

[weri812]

hello Bruce

your coil looks good 

i did not use any wax  spray only   

got one primary  done will wind another one to night after work 

be talking later

wer

[Earl]

@Rob,
by high quality I mean low series resistance and usable into the VHF / UHF / range and beyond.
XR7 allows high C values in small space and are good for general low-frequency by-passing, but are not desirable for coupling in low-noise amplifiers.  I have seen noise figures jump from 1.5 to 9 dB because of noisy, lossy dielectric.  A 330 pF SMD cap with low-loss dielectric is always nice to have in the parts box.  XR7 is inherently lossy and noisy, which for many applications is acceptable.  If you want to deliver Amps in nsec, I recommend
330 pF NPO or COG
1 to 10 nF
10 to 100 nF
all in parallel, all SMD, for FET driver by-pass.

@Eldarion
An oscilloscope with AC coupling and good HF scope probe (compensated while watching square wave) will show voltage sag on by-pass capacitors during gate charging.

What does the gate voltage look like when using a good probe?

Regards, Earl

Hi Earl,
I thought XR7 were high quality caps.
[snip]
Regards, Rob

[eldarion]

Hi Earl,

I would post a pic of the gate waveform with a good probe--if I had a good probe!

The best probe that I have is a 1x cheapie.  I am looking into getting some better x10 probes--something that I've put off for far too long!

I assume the gate waveforms are OK because I can scope across the FET output, and when the FET turns on the voltage drops straight down to zero--very little slope from what I can see.  Also, the FETs are stone cold, even at high frequencies.

I know the above observations will not replace good scope measurements, but that's all I can do at the moment...

Eldarion

[Bruce_TPU]

Hello All,

Well, I have just finished the dreaded inner core!     It took about 4 hours, with a lunch break about halfway through.  48 turns CCW, winding from the top to the bottom.

Taped everything up real tight, afterwards, and tomorrow I will start on the secondary.

Ended up using only wax for the center.  Perhaps my next core, I will try a different adhesive. 

Cheers,
Bruce