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Forums
4hv.org :: Forums :: General Chatting
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Post Your Cool Pic Here!

Move Thread LAN_403
Coronafix
Mon Sept 01 2008, 05:34AM
Coronafix Registered Member #160 Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Ooooo....I like where this is going. :)
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Backyard Skunkworks
Mon Sept 01 2008, 07:04AM
Backyard Skunkworks Registered Member #1262 Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
Yeah, that will really help with drainage at your property! LMAO

What the heck kinda power supply do you use for a coil that size? A polepig? dead
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Kizmo
Mon Sept 01 2008, 07:33AM
Kizmo Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Backyard Skunkworks wrote ...

What the heck kinda power supply do you use for a coil that size? A polepig? dead
Its not that hard to make or get ~10kVA @ 10-15kV transformer or transformer stack. Maybe pole transformer or few PTs in parallel

Pole transformers are kind of problematic where i live, 3ph power goes everywhere and we have usually quite big step down transformers (100-500kVA 20kV 3~ -> 400V 3~) feeding many apartments at once. Although it is possible to find something smaller like 10kVA but they are rare sad

I looked one 100kVA unit from junkyard and it was over 250kg :)
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Dr. SSTC
Mon Sept 01 2008, 08:06AM
Dr. SSTC Registered Member #1407 Joined: Fri Mar 21 2008, 07:09AM
Location:
Posts: 222
WoW, thats should make on powerful coil.

As for the power supply have you ever thought of using a large ferrite cores, powerd by powerfull fullbridges such as this one. Link2

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Avalanche
Mon Sept 01 2008, 11:34AM
Avalanche Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
Just been having a clearout and finding lots of interesting stuff!

This is the QRSS receiver I built/designed (in that order) for Chris's last QRSS transmission. The tricky bit was getting the crystal running at the right frequency whilst being stable. Notice how the crystal is taped up with toroid tape - I spent several hours 'inking' the crystal inside to shift its frequency, before taping it up. The thing was connected to a huge dipole that streched between the house and a tree at the top of the garden. Because I was lazy and needed to connect the dipole to the receiver inside, I simply cut the coax going to the TV antenna and used that cheesey

I never actually received any QRSS but it picked up a random US radio station really clearly cheesey



1220268867 103 FT6000 Img 4716
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teslacoolguy
Mon Sept 01 2008, 01:09PM
teslacoolguy Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
you have just taken point to point soldering to a whole new level. smile It is nice though how that little thing that lots of people would think would never work can pick up a radio station from over 2000 miles away.
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aonomus
Tue Sept 02 2008, 07:07AM
aonomus Registered Member #1497 Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
So after a long day of cleaning my workbench and putting up a shelf, plus tons of photography of various things... :D

Pile-O-Silicon!
IMG 0374

Parts assortments = Nerd Christmas
IMG 0366

Potentially crappy $2 tank cap
IMG 0368

And last but not least, a shot from my trip to China earlier this summer: think Mideval times in context of Feudal Chinese History
IMG 4025
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Avalanche
Tue Sept 02 2008, 10:03AM
Avalanche Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
I built this digital thermometer the other day, to keep me entertained during my break from work!

The unique feature is that it uses some very old (late 70's?) display modules, which actually have their own incremental counter underneath the 7 segments themselves. I've had these things for ages, they came from a clearout at my old workplace! Interfacing is simple, just a clock and a reset line for each module, amongst many other unused pins of weirdness. The whole thing is powered by an Atmel AVR (Tiny13) with an NTC thermistor.

Better than doing nothing cheesey


1220349753 103 FT6000 Thermowoot
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Marko
Tue Sept 02 2008, 11:46AM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
aonomus wrote ...

So after a long day of cleaning my workbench and putting up a shelf, plus tons of photography of various things... :D

Pile-O-Silicon!
IMG 0374


Where did you get the isotop devices, what are they?
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aonomus
Tue Sept 02 2008, 06:40PM
aonomus Registered Member #1497 Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
ST Micro's STTH120L06TV1, Link2
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