Magnetic Resonance Devices based on Don Smith Concepts

[xee2]

Anyone having trouble finding Spark Arrestors they are called Gas discharge tubes or GDT

Farnell do a whole bunch of different voltages

http://uk.farnell.com/jsp/search/results.jsp?N=0&Ntk=gensearch_001&Ntt=gast+tube&Ntx=&suggestions=false&searchTerm=gast+tube&_requestid=1275575&isGoback=false&isRedirect=false

Peter

In the US, Newark Electronics has a good selection also.

[Yucca]

@ Peterae/Yucca

How are you're tests coming along?  Any new news to tell us?

Still working with the 0.25 wave single secondary rig, I've seen some pronounced behaviour with regard to wiring configs:

When I connect the -ve side of the HV supply to the base of the secondary I see marked efficiency increase.

Further: when I then ground (to house radiator plumbing)  to the positive node of the FWBR another marked increase is seen.

Also I can load the system up with neons on sniffer coils, I tried 5, 1 above, 4 around and they all light brilliantly. As I add coils the existing coils do not diminish in brightness.

When placing a pickup bundle coil at the side it works strongest when vertically level with the primary.

My output gap and cap is the same spec as the input cap and gap so I think fire frequency gives me a fair representation of Pin/Pout ratio. I'm guessing I'm getting around 40% at the moment on output gap. BUT this does not diminish when I load the system further with neoned sniffer coils.

@All, (a little off topic),
I'm still thinking of building a 3 channel rock solid sin source with preamps up to 30MHz, I think the easiest way to go is make modular SMT boards, SMT seems cheap on components as Peter said plus researching I find that a good groundplaned SMT board gives the best HF performance with least stray capacitance.

The board would contain the DDS chip with crystal, elliptic filters and maybe HF opamp stage, a small disconnectable coax lead carries the signal to the users output port or maybe to an amplifier stage if they want to build one.

Boards can be simply stacked to add channels, 1 channel ... all the way up to four.

All channels controlled by a shared microcontroller and screen.

micro gives flexible software so multidimensional scanning could be programmed, the micro could also have an exposed (buffered) ADC pin for feedback, this way the system can be left scanning for days searching for maximal signal into ADC and the possibility of logging data back to the PC via USB for deeper analysis.

I guestimate a minimal bare bones 3chan up to 30MHz system would cost around $300 to make, but the pureness of freq could only be found in lab equipment costing a few grand new.

I just splashed out on a nice chinese shaft encoder which I plan to control the thing with:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320420562507#ht_2561wt_1167

[Peterae]

@forest
I would imagine that a number of these could be placed in series to increase the gap voltage, although i have never tried this.

@Yucca
Great work thanks for sharing.

I like the idea of the Sig gen, spec sounds great, Wow that is some control encoder.


Peter

[stprue]

Hi stprue

I am not much further ahead yet, i have been waiting on bit's and pieces.
but i have now sourced 5 Spark arrestors and they have arrived.
I have all my diodes and a bunch of HV caps including a couple of door knobs.
I have HV wire for my primary but have had trouble working out where to get 2 inch pipe to wind my primary on, i tried the local DIY store but they dont have any here in the UK, although i do have my eye on the Mrs Plastic Vitamin bottle LOL which is about 2 inch diameter.
I hope to build the primary and check the inductance out with my new meter and see what Don was aiming for with the 0.2uF caps and see how this compares with my secondary theoretical freq.

Peter

Well that sounds like your making lots of headway!  I found 2inch dia. PVC plumbers piping at a local hardware store.

[stprue]

Still working with the 0.25 wave single secondary rig, I've seen some pronounced behaviour with regard to wiring configs:

When I connect the -ve side of the HV supply to the base of the secondary I see marked efficiency increase.

Further: when I then ground (to house radiator plumbing)  to the positive node of the FWBR another marked increase is seen.

Also I can load the system up with neons on sniffer coils, I tried 5, 1 above, 4 around and they all light brilliantly. As I add coils the existing coils do not diminish in brightness.

When placing a pickup bundle coil at the side it works strongest when vertically level with the primary.

My output gap and cap is the same spec as the input cap and gap so I think fire frequency gives me a fair representation of Pin/Pout ratio. I'm guessing I'm getting around 40% at the moment on output gap. BUT this does not diminish when I load the system further with neoned sniffer coils.

@All, (a little off topic),
I'm still thinking of building a 3 channel rock solid sin source with preamps up to 30MHz, I think the easiest way to go is make modular SMT boards, SMT seems cheap on components as Peter said plus researching I find that a good groundplaned SMT board gives the best HF performance with least stray capacitance.

The board would contain the DDS chip with crystal, elliptic filters and maybe HF opamp stage, a small disconnectable coax lead carries the signal to the users output port or maybe to an amplifier stage if they want to build one.

Boards can be simply stacked to add channels, 1 channel ... all the way up to four.

All channels controlled by a shared microcontroller and screen.

micro gives flexible software so multidimensional scanning could be programmed, the micro could also have an exposed (buffered) ADC pin for feedback, this way the system can be left scanning for days searching for maximal signal into ADC and the possibility of logging data back to the PC via USB for deeper analysis.

I guestimate a minimal bare bones 3chan up to 30MHz system would cost around $300 to make, but the pureness of freq could only be found in lab equipment costing a few grand new.

I just splashed out on a nice chinese shaft encoder which I plan to control the thing with:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320420562507#ht_2561wt_1167

That's interesting Yucca, I have seen similar increases in performance when grounding as well with my little hairpin.  Your freq. board idea sounds fantastic, I can't waite to see it.  I will probably build a simpler version using the links you showed me.  I was thinking 3 freq.  but I'll waite to see what Bruce shows us.