Donald Smith Devices too good to be true

[Wistiti]

Finally I found a 8" pipe!!!
I may start wind the coil soon

[Wistiti]

Thank you tswift for your reply.
I already have this lc meter: NEW UNI T Modern Inductance Capacitance Meter UT 603 | eBay

And this cheap scope:Hantek 6022BE PC Based USB Digital Storag Oscilloscope 48MSA S 20MHz 2 Channels | eBay

I will try as you say...

Hope to not fry the scope...

[tswift]

Tuning frequency of the resonant circuit can be done approximately by measuring the capacitance of the capacitor and the inductance of the coil separately with an LC or LCR meter. This won't take into account factors like the parasitic capacitance of the coil so the computed frequency will generally be high compared to an actual measurement. You can measure the actual resonant frequency at low voltage by using a function generator to drive the cap and coil in parallel (through a resistor of 1K-10K), while watching the voltage across the LC tank circuit combo on an oscilloscope. There will be a very noticeable voltage peak at the parallel resonant frequency, but to do this you have to have a scope and a function generator. Even then, I have found that the actual resonant frequency in-circuit while being driven with the spark gap is not always quite identical but it's quite close.

So if you want the $20 solution, you can get a cheap LC meter from ebay. They work OK and will get you in the ballpark. The better answer involves better test equipment and more money. I have been impressed with this Hantek DSO I have, they are reasonably priced and so far it's been quite resilient to damage even working around HV/HF. For regular multimeters I have now gone analog, frying digital meters gets old.

[Wistiti]

Ideally you need a frequency meter.

Yes i have some but in the past i have fried meters (digital) when i play with hv/hf... The reading goes like crazy and they just became useless caure they are no longer acurate.

Maybe by having long wire on the low voltage side to get away from the device wile taking mesurement...
I just wonder if you guys have better way to do it cause im not familliar with it.

[soundiceuk]

Ideally you need a frequency meter.

[Wistiti]

My question of the day!

How do you guys achieve and measure the 500khz?
I suppose it is by varying the gap on the PPV'X' but, in the past, I fried MANY meters on project with spark gap and I need help on the correct way to achieve it...

Any help will be appreciate!

[med.3012]

this is a quote from smith.pdf

[med.3012]

another technical request


How much level can the earth ground quality effect an over energy device ? i am doing some experiment where the earth play a critical role , standing waves can be seeing very easily either with a small light bulb or using a scope probes ..

all the test are based on the ETBC but with a ferrite rod inside, the capacitors banks can be charged only when there's an earth ground, now the question arise to how much level will affect the system ?


thanks in advance !

[soundiceuk]

They were used to prevent the primary and secondary arcing out.

The ions flow in surges and sometimes the surges are huge. Like waves of the ocean!

Overkill if you are not using a high voltage multiplier.

You could get away with using 50V rating for a proof of concept.

[Wistiti]

Hi Soundiceuk and thank you for your quick reply! It is appreciate.

My last question ... ...for today!

Do the variable air cap really need to be 1,5kv rating?? In the new version (V.7.0.0) they both are on the low voltage side... I don't understand why a 250v will not do the job?
If so it will be another great news cause these are much less expensive and easily found than the 1500v ones.

Thank you again for your great support!

[soundiceuk]

A question about the ant. Can the 468ft be put over an existing building (like in the schematic) or it is not recomand??

As long as it is well insulated that will be fine.

It is only for experimentation purposes and not for use in thunder and lighting storms or you will need a lightning arrestor.

Consider Mwtj's grid design also.

[soundiceuk]

The coil is put there just for the photo.

The real coil should be HV wire.

The only third party working replication I have seen is Mwtj and his uses HV wire.

Mwtj did say in a post that there was loads of static and corona with magnet wire so he switched to 1KV magnet wire.

That was really on its limits using 15kv-20kv.

Magnet wire isn't ideal.

Maybe if you space it out you will get away with it for a proof of concept.

[Wistiti]

A question about the ant. Can the 468ft be put over an existing building (like in the schematic) or it is not recomand??

[Wistiti]

Thank you guys for the info on the cap. It is good news!

Sorry for that but I have another question... (as I have said before I may have many!! )

It is the second time I see a replication using magnet wire on the hv side. (L1-L2) Do these wire are really enough insulate for that??? If so it is another good news cause I have a bunch of them. For how much volt are they be made for? Maybe using these magnet wire with some spacer between the turn to avoid arcing, I think of something like plastic wire from a grass trimmer...

[soundiceuk]

Yes, these will work.


These look huge in comparison!