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Need conductor non-corroding in air @ 2800*C
[quote][i]Originally posted by Quince[/i]
Can anyone suggest a way to block UV that would not aff ... |
16-1-2006 at 13:08
by: Twospoons |
Primaryless Detonators
A MOSFET and a thyristor of similar rating will be about the same price, but I'd put money on the th ... |
12-1-2006 at 20:44
by: Twospoons |
What part should i try to remove and keep from a refrigerator that i found in the street?
The entire refrigeration circuit - thats the compressor, JT valve, evaporator, condensor and all the ... |
12-1-2006 at 20:39
by: Twospoons |
Primaryless Detonators
[quote][i]Originally posted by Boomer[/i]
Twoospoons I remember that fence. Are you possibly on E ... |
12-1-2006 at 16:59
by: Twospoons |
Primaryless Detonators
A chunky thyristor might do it. I designed a 36J electric fence energiser some years back that used ... |
11-1-2006 at 22:30
by: Twospoons |
Primaryless Detonators
Perhaps your bimetallic bridge wire could be made by plating one metal on top of the other? Maybe b ... |
10-1-2006 at 22:03
by: Twospoons |
Temperature Controller for hotplate etc
Thats a very different beastie - you have no temperature feedback. All you are doing is providing a ... |
10-1-2006 at 21:44
by: Twospoons |
Primaryless Detonators
Its [i]because[/i] the voltage reflection is inverted that the current goes up! Its like connecting ... |
9-1-2006 at 20:04
by: Twospoons |
efficent conversion of wood to energy
Crucial question : is it treated timber? If so you are going to have to deal with either toxic flue ... |
9-1-2006 at 13:55
by: Twospoons |
Temperature Controller for hotplate etc
I said "inconvenient" not "impossible". The technique is also used in Pirani pressure gauges, where ... |
6-12-2005 at 23:20
by: Twospoons |
microwave modifications
Wavelength is 12cm at 2.45 GHz. And for significant attentuation the holes need to be less than 1/2 ... |
6-12-2005 at 17:57
by: Twospoons |
microwave modifications
This is the sort of scenario where one needs to build the electrical equivalent of a fume hood : whi ... |
6-12-2005 at 13:38
by: Twospoons |
Carbon arc Furnace
You need to talk to a transformer manufacturer. The material is grain oriented silicon iron, and the ... |
5-12-2005 at 20:18
by: Twospoons |
Temperature Controller for hotplate etc
Its your cellaring technique! They need to be kept at -113C, and sealed in anti-static bags with so ... |
5-12-2005 at 19:44
by: Twospoons |
Temperature Controller for hotplate etc
Honestly, zeners are just easier! They come in a hundred different flavours and they're dirt cheap! ... |
5-12-2005 at 13:30
by: Twospoons |
Ranque-Hilsch vortex tubes.
I looked at these several years ago and thought maybe one could be used in the expansion stage of an ... |
4-12-2005 at 15:24
by: Twospoons |
Temperature Controller for hotplate etc
IrC a varistor wont work - its a breakdown device and wont regulate the way zeners do (thats what th ... |
4-12-2005 at 15:19
by: Twospoons |
Temperature Controller for hotplate etc
Here is a schematic for a temperature controller for mains powered hotplates. It is a simple propor ... |
1-12-2005 at 22:31
by: Twospoons |
Elemental sulfur from sulfates
I had a very old bottle of slightly used photographic fix solution ( a thiosulphate usually) that I ... |
30-11-2005 at 19:28
by: Twospoons |
Home made spectrometer
I say "toh - mah - toh" , you say "toh - may - toh". |
23-11-2005 at 12:50
by: Twospoons |
Home made spectrometer
Marvin, the term 'oversampling' is [i]also[/i] used to describe digitising the same thing ... |
22-11-2005 at 18:09
by: Twospoons |
Home made spectrometer
[quote][i]Originally posted by woelen[/i]
With some mathematics and analysis of the RGB data I shou ... |
22-11-2005 at 15:04
by: Twospoons |
Home made spectrometer
[quote][i]Originally posted by Tacho[/i]
...Identical photosensors ...[/quote]
And there you hav ... |
22-11-2005 at 13:25
by: Twospoons |
Any soil scientists out there?
I had a look at the principle of the atomic absorbtion spectrometer, and it seems reasonably straigh ... |
21-11-2005 at 13:19
by: Twospoons |
Home made spectrometer
Your best broadband light source will be a thermal one - tungsten halogen, xenon flash, or a metal h ... |
21-11-2005 at 13:04
by: Twospoons |
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