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Author Topic: Magnetic Resonance Devices based on Don Smith Concepts  (Read 453345 times)

Peterae

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #300 on: September 22, 2009, 11:03:10 PM »
Thanks xee

Number 3 is what i am after, so i take that as a no the tails are not included in the quarter length of wire, this is telling me i need less turns on my secondary, so i now wonder how Don managed this relationship, i could do it if it included the tails.

Peter




Yucca

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #301 on: September 22, 2009, 11:05:38 PM »
Hi Yucca

Do i include the tails length as well as the 5 turns wire length to equal 1/4 of my secondary wire length.

I don't know, haven't tried that in experiment yet. But my main secondary has 9inch leads powering it and my sniffers are best when the same length as only the coiled wire.

nice GUI is that a dot matrix display, i ask because how did you get the menu at the bottom, what is the processor.
Hi Peter,

It's a 128x128 16bit colour LCD, a nokia part from phones a few years back. I programmed the main numbers to look like 7seg oldstyle displays, so you can see the off segments still as very light grey.

The green bars can be moved to any digit in any channel (or to menu), the user then presses select and that number can be adjusted, its adjusted by its multiplier so if you keep winding then the higher decade digits to the left will change on 10 rollover.

I'm trying to make best use of display area for the main freq readout, when you enter the menus then the font is small (like menu is written with).

Yucca.

Peterae

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #302 on: September 22, 2009, 11:27:52 PM »
Yucca
Nice work, it was the grey segments that threw me, so it must have a driver chip embeded i guess for easy interface.

I wanted to make the primary coil tomorrow, but now i need to think some more, as the primary is 5 turns and the secondary 19- 20 and the primary is smaller diameter it is impossible for me to make it a quarter of the wire length by quiet a bit the only thing i can think of is to chop down the secondary length to match 4 x the primary, i will crunch the numbers tomorrow and see how much i need to lose.
I think xee is right about the tails not being an active part because in the pictures one of the tails is longer than the other with regard to where they goto on the connector block.


Peterae

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #303 on: September 22, 2009, 11:36:35 PM »
Ah maybe if i make the primary and fire up the spark gap with no caps and use a neon to find the node on the secondary that will tell me where the point is, i think Don said that somewhere as well, do you think that is possible.

Yucca

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #304 on: September 22, 2009, 11:38:51 PM »
Yucca
Nice work, it was the grey segments that threw me, so it must have a driver chip embeded i guess for easy interface.

I wanted to make the primary coil tomorrow, but now i need to think some more, as the primary is 5 turns and the secondary 19- 20 and the primary is smaller diameter it is impossible for me to make it a quarter of the wire length by quiet a bit the only thing i can think of is to chop down the secondary length to match 4 x the primary, i will crunch the numbers tomorrow and see how much i need to lose.
I think xee is right about the tails not being an active part because in the pictures one of the tails is longer than the other with regard to where they goto on the connector block.

Yes it has its own video buffer RAM and an SPI interface to adjust said RAM, you can plot pixles or horizontal lines with one instruction packet. I coded an 8x8 font and also a larger 7seg lcd type font taking advantage of horizontal spans to maximise speed.

I think also xee is correct, only active inductive wire length may be important. If your supply lines are straight then L element wil be low and C will depend on interwire proximity.

xee2

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #305 on: September 22, 2009, 11:50:38 PM »
@ Peterae
Number 3 is what i am after, so i take that as a no the tails are not included in the quarter length of wire,

I am not sure what you mean by "tails". If "tails" are the leads going to the coil then it depends on how long they are. They always effect the circuit performance, but if they are less than 1/10 wavelength they can usually be ignored. I do not know what you are trying to do so I am probably not very helpful.




stprue

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #306 on: September 22, 2009, 11:59:57 PM »
@Yucca Veerrrry nice sig gen.

Peterae

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #307 on: September 23, 2009, 04:04:50 PM »
Nice display there Yucca for what i can imagine cost zero as it came from an old phone,a very pleasing price if i may say so  ;D

Well i built the primary, wire length of the 5 turn coil was 85cm without tails.
Inductance = 2.41uH
Parallel Resistance = 0.5034 Ohms
Series Resistance = 0.0527 Ohms
Impedance = 0.138 Ohm
Q = 3.39
Tested @ 10khz

So with the 200nF cap he has used i would have a theoretical primary resonance of 229.243 khZ

My Secondary is going to need cutting down
but here's it's current measurements

Inductance = 16.03uH
Parallel Resistance = 21.8 Ohms
Series Resistance = 0.0473 Ohms
Impedance = 1.0062
Q = 21.36

Tested at 10khZ

So with the 47nF Don used would give me a resonant freq of 183.359khZ
which isnt far from my primary considering my secondary is at least 1turn to long in length.

Peter


« Last Edit: September 23, 2009, 05:20:54 PM by Peterae »

Peterae

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #308 on: September 23, 2009, 05:36:02 PM »
xee
Yer i refer to the coil leads as tails.
Thanks for the info it's handy to know this

Yucca
You mentioned before that Don seems a little mischievous in his personality having watched the videos again, i agree 100%, you get the feeling he is playing with the people asking questions, gives me the impression he likes people to at least work somethings out for themselves, i wonder if it is this that leads to the conflicting information, after all he earned his glory and put the time in on the bench, he's obviously a very clever man.

I love the way he talks about how he lost his job as a Geologist, when he was earning so much more than some of his bosses LOL


Peter

stprue

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #309 on: September 23, 2009, 05:55:35 PM »
Great work Peterae looks just like Don's photo!

Yucca

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #310 on: September 23, 2009, 07:03:50 PM »
xee
Yer i refer to the coil leads as tails.
Thanks for the info it's handy to know this

Yucca
You mentioned before that Don seems a little mischievous in his personality having watched the videos again, i agree 100%, you get the feeling he is playing with the people asking questions, gives me the impression he likes people to at least work somethings out for themselves, i wonder if it is this that leads to the conflicting information, after all he earned his glory and put the time in on the bench, he's obviously a very clever man.

I love the way he talks about how he lost his job as a Geologist, when he was earning so much more than some of his bosses LOL


Peter

hi Peter, your primary and secondary are already pretty close, good job to land in the right area on the first fireup! For exact tuning I guess HV variable cap is needed in parallel to primary cap. Otherwise a slideable clip on your secondary to make fractional turns changes maybe, my wire is enamelled so that is difficult for me. I can't wait for you to fire it up! I've found tubes from dead CFL lightbulbs make great loads over the output cap then a rough eyeballing can guesstimate power.

Yes Don is obviously a clever man, no doubt about that! As you say he used to be a geo guy for petro industry. A tiny slither of me wonders if he took on the job of FE misinformation agent in his latter years lol, because its quite a volt face move from petro to FE, but that's just me keeping an open mind to all possibilities. At the moment odds wise, I'm leaning more toward his devices being true.

Yucca.

Yucca

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #311 on: September 23, 2009, 07:36:21 PM »
@Sptrue and All:

I've started another thread for the 3 chan SIN generator to stop dilluting this threads info:

http://www.overunity.com/index.php?topic=8087

Yucca.

Peterae

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #312 on: September 23, 2009, 08:01:06 PM »
Thanks for the comments guys.

I seem to be in spend mode at the moment LOL

A bit of advice i am planning on getting a 10hz to 2.4GHz freq counter, i would imagine this will be very handy for test on the coil setup.
It comes with a UHF aerial but surely this wont pickup the lower frequencys for measurement, any advice is welcome

http://cgi.ebay.co.uk/YAEGE-FC-1-Portable-Frequency-Counter-10Hz-2-6GHz-VX-8R_W0QQitemZ350192136138QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item518913efca&_trksid=p3286.m63.l1177

Also there is another meter that does 1mhz to 2.4ghz and has a power meter with watts measurement, this could be handy as well but i think i will need lower than 1mhz for Dons setup which is a real shame.

http://cgi.ebay.co.uk/Portable-Frequency-Counter-Power-Meter-GY561-for-VX-8R_W0QQitemZ180317761081QQcmdZViewItemQQptZUK_ConsumerElectronics_SpecialistRadioEquipment_SM?hash=item29fbc6ae39&_trksid=p3286.c0.m14

Cheers,
Peter

stprue

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #313 on: September 23, 2009, 08:01:38 PM »
Yucca

I just read through it.  As usual that is some great work Yucca.  I'm not sure if my skill level or lack there of will be able to replicate, but I will read, ask questions and hopefully learn something.

forest

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Re: Magnetic Resonance Devices based on Don Smith Concepts
« Reply #314 on: September 23, 2009, 08:26:01 PM »
Hmm... what if Don's secondary coil is made of stranded wire ? Or even primary too... Crazy idea but who knows ?