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Photochlorination apparatus, setup of multiple UV LED lights, help please...
You do want them in series groups of three, with a 68 ohm resistor for each group. Then you put the ... |
5-7-2005 at 20:17
by: Twospoons |
spectroscope
The pyroelectric sensors used in motion detectors cover the 5-14um IR range. I guess some kind of s ... |
4-7-2005 at 14:55
by: Twospoons |
spectroscope
If you remove the IR filter in the lens then most webcams will detect infra-red down to 1000nm. So ... |
30-6-2005 at 20:51
by: Twospoons |
Microwave-made Nitric Acid
[quote][i]Originally posted by neutrino[/i]
Twospoons: that idea sounds pretty dangerous. [/quote]
... |
30-6-2005 at 20:45
by: Twospoons |
Microwave-made Nitric Acid
Using the components from the microwave (ie supply and magnetron) a microwave plasma torch can be co ... |
30-6-2005 at 15:11
by: Twospoons |
A history challenge
You want gas pressure? Then use limestone and vinegar! They've been available for centuries! |
28-6-2005 at 18:54
by: Twospoons |
mixture that smokes in air
I was wearing latex gloves at the time ... |
9-6-2005 at 18:23
by: Twospoons |
mixture that smokes in air
I've used the HCl /NH3 trick at my daughter's birthday party. Using dilute solutions stil ... |
9-6-2005 at 13:54
by: Twospoons |
DIY magnetic stirrer
[quote][i]Originally posted by Quince[/i]
$15, are you nuts? Any little junk motor will do. Why b ... |
7-6-2005 at 16:10
by: Twospoons |
DIY magnetic stirrer
Its really much simpler to use DC motor with a reduction gear. My local electronics supplier has t ... |
6-6-2005 at 20:54
by: Twospoons |
Voltage Data to text file
I suppose the other question that should be asked is - Why such a small budget? Is it a personal pr ... |
6-6-2005 at 20:44
by: Twospoons |
Tap PSI
Usually the valve will have a pressure rating marked on it somewhere. Depending on the valve design ... |
2-6-2005 at 14:10
by: Twospoons |
High emissivity furnace coating
Finally stumbled onto a formula for a high emissivity furnace coating.
[quote]
United States Paten ... |
1-6-2005 at 20:55
by: Twospoons |
Voltage Data to text file
Having worked with thermocouples in electrically noisey environments I can recommend a few tricks t ... |
1-6-2005 at 14:20
by: Twospoons |
Woo hoo, I built a working ball mill!!!
I'll add my 2 cents by mentioning the cheap 5 litre pressure sprayers (garden shop) that make f ... |
30-5-2005 at 14:36
by: Twospoons |
Ammonium Persulphate production
No, absolutely not. I've used it and there is no smell or fizzing, just a few small bubbles wh ... |
30-5-2005 at 14:25
by: Twospoons |
Aluminate chemistry
I've seem the term "sol-gel " used a lot with reference to strontium aluminate synthe ... |
23-5-2005 at 21:39
by: Twospoons |
Ammonium Persulphate production
Go to Jaycar, instead! They sell ammonium persulphate, and don't sell ferric chloride. DSE is ... |
23-5-2005 at 15:31
by: Twospoons |
Voltage Data to text file
I'd say [url=http://www.oatleyelectronics.com/kits/k090.html]this[/url] would be exactly what y ... |
18-5-2005 at 22:06
by: Twospoons |
NaOH in EtOH, colour?
This morning I made some etch solution for polyimide (Kapton), cosisting of 6% wt NaOH in 80% wt Et ... |
17-5-2005 at 17:21
by: Twospoons |
sapphire?
Cutting and drilling might be done with a chemical etch, and suitable masking of the saphire. Doesn ... |
16-5-2005 at 23:08
by: Twospoons |
Desktop fusion with pyroelectric crystals
The site I linked to above quotes the melt point as 1600C. Not a simple task, but hydrogen flame fu ... |
4-5-2005 at 00:05
by: Twospoons |
Desktop fusion with pyroelectric crystals
Like from [url=http://www.sawseek.com/prody1.html]these guys?[/url] |
3-5-2005 at 19:14
by: Twospoons |
home made damp rid
No, the question was for a [u]cheaper[/u] alternative! Bulk CaCl2 is cheaper than the nicely packag ... |
3-5-2005 at 17:38
by: Twospoons |
From where are you?
New Zealand. Which is not Australia.
In fact, I'm about 20km north of Weather Top, for you ... |
28-4-2005 at 15:41
by: Twospoons |
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