Successful TPU-ECD replication !

[c0mster]

I?m am not sure what Otto might be referring to. He may mean his resistors on the mosfet may not work on the 730?s. It?s the capacitance of the fet that holds the mosfet on and that needs to be bled to ground with a resistor also it is a good idea to put a resistor to ground on the input to the driver from the 555?s or function gennies, otherwise the mossfet may not switch proper. Perhaps this is what he is referring too.

I am going to build another bottom ring and wrap right over the pipe as Otto describes. Just to make sure. Also I picked up another proto board today so I can have the mosfets inside the TPU.

This reminds me of the Gunderson experiment I did, It did show a change in the output of the horz wire?s sine wave when I tilted it upside down.

I would like to find a faster switching mosfet if I get the chance, as you said the 730?s are a wee bit slower but when I compared the two types I found the 840?s blew easer and drew more amps and I seem to get the same effects from the 730?s.

Anyone do the math to insure their gauge of wires were weight equivalent? 

Heres a pic of Tesla's coil he used to write a name. 

Cam   

[c0mster]

OL

[c0mster]

OL

[gn0stik]

As per the document
Secondary 10.5m of .35mm wire
Primary 4.2m of .5mm ? 1mm wire
Control coils must be mass equivalent:

.5mm= 24gauge = .00122lbs per ft
1mm= 18gauge = .00492lbs per ft

4.2 meters = 13.777 feet
10.5 meters = 34.44 feet

13.777 ft * .00122Lbs per ft <24 gauge>= .01586lbs

.35mm = 28gauge = .00048Lbs per ft

.01586/.00048 = 33.04167ft of 28gauge

The doc math closely matches using 24 gauge as primary and 28 gauge as secondary.

Cam

Thanks Cam, Had to recheck my wire gauges after that, because my weight is a lot higher. 12 grams per coil segment(primary and secondary), yours are equivalent to 7 grams per.

so, I have mine wrong, using the rat shack stuff. Shoulda checked ahead of time, as my coil lengths probably are not ideal with these gauges.

Turns out my gauges are 22 and 26, respectively.

Much heavier gauge on the primary, and slightly heavier on the secondary. So my coils are bigger. We'll see the effect.

got my drivers, Still haven't gotten my fets yet.

bad shipping luck.

However, got lotsa extras so I can burn as many as I want, when they come. As now roberto is testing a new fet which seems even better.

Better make my board with sockets for the fets.

Rich

[wattsup]

@cOmster

In the ECD-TPU document that comes from the "Read this first" thread by Stefan on page 25, these are the specs given.

Wire Primary: 0.65mm., 4.20 mt
Wire Secondary: 0.35mm, 16mt

Could you please avise on where your specs come from since I may be looking at the wrong doc.

I am just about to wind my CC so I really need to make sure. There is a major difference between the 18 gauge you have indicated and what was in the doc.

Last question... does anyone know how to connect a primary and secondary center tap when winding the CC so I can test sending the frequency into the primary center and maybe try to feed the ring from the secondary center back to the secondary end. Does the tap need isolation from its connection point to where it is comming out of the coil?