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Alternative to magnetic stir-bar?
Personally i prefer PICs, yet i'd use an arduino for PWM these days, simply due to the ridiculously ...
7-6-2015 at 23:35
by: aga
Anything to be wary of
[url]http://en.m.wikipedia.org/wiki/Endospore#Formation_and_destruction[/url]

"Endospores are abl ...
7-6-2015 at 23:31
by: aga
stepper motor power supply
Just pick up a used PC PSU and it will be absolutely fine.

PCs don't run too well on dirty power, ...
7-6-2015 at 14:11
by: aga
Things That Frustrate As A DIY Chemist
Nope.

We're all Odd and live all over the planet, and don't really do 'people events' as well as ...
7-6-2015 at 13:50
by: aga
Pretty Pictures (2)
And so you shall TVC !
7-6-2015 at 13:43
by: aga
Anything to be wary of
[rquote=408492&tid=62684&author=Zombie]Many common pathogens survive boiling temps.[/rquote] ...
7-6-2015 at 13:39
by: aga
Alternative to magnetic stir-bar?
One solution to a difficult viscous liquid in a 3L RBF would be multiple stirbars.

Needs multiple ...
7-6-2015 at 13:30
by: aga
Anything to be wary of
If you're paranoid, put a lid on the pan, or use a pressure cooking pot.

Most likely this has alr ...
7-6-2015 at 13:17
by: aga
Selling my two 19L pyrex Carboy
For beer ?

Far too small, even for day-to-day domestic use ;)
7-6-2015 at 13:13
by: aga
Anything to be wary of
Boil them.

All Life tends to stop above about 72 C after a few minutes.

Give it an hour of boi ...
7-6-2015 at 13:09
by: aga
How to circulate solution without contamination?
[rquote=408309&tid=62660&author=JohnBee]Disclosing the product would undermine the potential ...
7-6-2015 at 11:18
by: aga
Building a polarimeter
The DC motor/encoder has led to all sorts of useful DSP routines you now have in your library, plus ...
7-6-2015 at 11:10
by: aga
Building a polarimeter
Thanks for the explanation of FFT - i get it now !

Oh i can put the stepper anywhere i want, just ...
7-6-2015 at 10:25
by: aga
Building a polarimeter
Cheers smaerd.

I can see now why the data needs to be smooth and have no lumps !

The complexit ...
7-6-2015 at 07:47
by: aga
Building a polarimeter
Moving average smooths the data OK.

Calculating the best fit sine and then the peak is boggling t ...
6-6-2015 at 22:36
by: aga
Titrating for saponification
AFAIK you need to evaluate the sap number of a small sample of your oil using KOH before you can sa ...
6-6-2015 at 13:30
by: aga
aga's ridiculous model of Matter.
Update :

I went and had a chat with Steve.

After about 10 seconds of careful consideration he ...
6-6-2015 at 13:25
by: aga
Simplest Colorimeter
Farming on a small scale can be done in all situations.
6-6-2015 at 13:11
by: aga
Building a polarimeter
Nope.

The moving average works, but the other 'cog' thing doesn't seem to.

Edit :

any chanc ...
6-6-2015 at 12:08
by: aga
Simplest Colorimeter
Thou jesteth surely ?
6-6-2015 at 11:54
by: aga
Simplest Colorimeter
Build one IrC !

Build. Build. Build.
6-6-2015 at 11:18
by: aga
Building a polarimeter
Been kicking this around a bit today, and came across a couple of references that seem to work, and ...
6-6-2015 at 04:44
by: aga
How to circulate solution without contamination?
[rquote=408295&tid=62660&author=Bot0nist] understand the need for some projects to be kept c ...
5-6-2015 at 14:44
by: aga
How to circulate solution without contamination?
So many Egos here.

It is troubling that such brilliant minds are so easily blinded.

Anyway, ju ...
5-6-2015 at 14:20
by: aga
Building a polarimeter
The graphing routines are pretty crude, so don't rely on them too much !

I just wanted a graph on ...
5-6-2015 at 13:03
by: aga
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