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Plasma Generation by Household Microwave Oven for Surface Modification and Other Emerging Applications
And if you don't want to use a microwave, heres one I built from acrylic, a bell jar, and a simple H ...
13-8-2018 at 13:47
by: Twospoons
Increasing water pump pressure using 2 pumps in series?
The risk you take is that the housing and seals of the second pump will experience double the pressu ...
25-7-2018 at 20:32
by: Twospoons
Winding flyback secondary?
[rquote=521220&tid=83533&author=Foeskes]Any tips on insulating the layers?
I tested the old ...
11-6-2018 at 13:34
by: Twospoons
Robo challenge event: 2D pattern matching needed
OK, giving away all my secrets now ;)

How about a passive beacon with an active camera?
The bea ...
1-6-2018 at 15:56
by: Twospoons
lightning storms
[rquote=520193&tid=83522&author=Vomaturge]But I really don't see how 10-30kV would make such ...
1-6-2018 at 15:19
by: Twospoons
Robo challenge event: 2D pattern matching needed
If you do go this route its important to take the two images an integer number of mains cycles apart ...
31-5-2018 at 18:22
by: Twospoons
Robo challenge event: 2D pattern matching needed
Are you designing the beacon? If so perhaps you could make it flash - then you could use image subtr ...
31-5-2018 at 14:29
by: Twospoons
Propane tank in full sunlight: dangerous ?
from: http://www.elgas.com.au/blog/1969-how-much-pressure-is-in-lpg-propane-cylinders-in-what-state
...
27-5-2018 at 13:51
by: Twospoons
Making invisible markings on paper (needs to be not commonly known or easily seen)
Would you go as far as radio isotopes? That could be revealed by photographic paper placed adjacent ...
21-5-2018 at 00:58
by: Twospoons
Mixing Thermoplastics, Equipment and Chemistry?
How about making a cutter to sit at the end of your extruder, turning filament back into pellets. Th ...
20-5-2018 at 13:00
by: Twospoons
Cool electronic devices you can make for thr lab but are uncommon.
And epoxy has a higher expansion coefficient than either aluminium or ceramic, by a factor of two.
...
14-5-2018 at 13:17
by: Twospoons
Cool electronic devices you can make for thr lab but are uncommon.
[rquote=517446&tid=82665&author=coppercone][rquote=517420&tid=82665&author=Ubya]1kW ...
11-5-2018 at 12:35
by: Twospoons
Hot air balloons- What is % O2 inside the envelope?
If you use an electric heater to fill the balloon, then the answer is clearly 21%. I have no idea h ...
8-5-2018 at 14:14
by: Twospoons
Only Half Human
Makes me wonder if we exist for the bacteria's benefit, rather than them for ours. As if we are noth ...
12-4-2018 at 15:25
by: Twospoons
Where does heat go in a battery?
No thats not the vertical label, thats the chart title. Google sheets isn't a great tool sometimes.
...
10-4-2018 at 13:46
by: Twospoons
Where does heat go in a battery?
Ok, so consider a hypothetical battery of 12V, with an internal resistance of 100 ohms, modeled belo ...
10-4-2018 at 13:28
by: Twospoons
What is stronger? Sunlight or artificial light?
Just for fun I thought I'd work out the power flow from a "cooking pot" at 4000C, assuming an emiss ...
8-4-2018 at 23:14
by: Twospoons
Fisher Accumet IC (transistor?) replacement?
The NTE960 should work for you. Its pin compatible with the 7805. The other one wont - it needs a co ...
6-4-2018 at 22:14
by: Twospoons
Robotics - building an dual axis (X,Y) camera mount
I'd go steppers with a microstepping driver, then you only need a home switch instead of encoders. ...
6-4-2018 at 22:07
by: Twospoons
Fisher Accumet IC (transistor?) replacement?
[rquote=513260&tid=81762&author=PiledhigherandDeeper]
Best I can tell is the middle pin con ...
5-4-2018 at 20:56
by: Twospoons
Fisher Accumet IC (transistor?) replacement?
Educated guess is its a 7805 regulator chip, based on the partial part number, and the connections I ...
5-4-2018 at 18:49
by: Twospoons
Analog hotplate: no more rythmic light dimming?
Use LED lighting. Or compact fluoros.
The control circuitry in either one will maintain constant l ...
3-4-2018 at 14:17
by: Twospoons
Making an acrylic büchner funnel
[rquote=512902&tid=81589&author=DrP]Are these acrylics and PLAs solvent resistant? [/rquote ...
3-4-2018 at 14:04
by: Twospoons
Making an acrylic büchner funnel
[rquote=512398&tid=81589&author=aga]
I guess it could all be 3D printed.

Easier as two p ...
2-4-2018 at 13:42
by: Twospoons
The fiberglass or ceramic material used to make heating mantels - what is it?
Carbon fiber is electrically conductive, so you can't use it around a nichrome element.
30-3-2018 at 16:38
by: Twospoons
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