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A lab 40V 250W power supply
Apparently there are some problems with attempts to measure voltage on pin 1 of the 494, with the su ... |
15-8-2008 at 18:47
by: len1 |
Home chemist raided in MA, lab seized.
Reminds me of the Soviet gulags, where everone thought all were here for a reason except himself. R ... |
15-8-2008 at 15:30
by: len1 |
A lab 40V 250W power supply
[quote] Not to a first approximation, in fact not at all. This is a forward converter, not flyback. ... |
15-8-2008 at 13:17
by: len1 |
A lab 40V 250W power supply
The 494 is designed to control duty, and hence voltage, to keep voltages on pins 1 and 2 equal.
A ... |
15-8-2008 at 05:05
by: len1 |
A lab 40V 250W power supply
This post is for someone who wishes to develop a 40V 200W lab power supply from a standard PC XT sup ... |
15-8-2008 at 04:47
by: len1 |
Repairing Infrared Spectrophotometers
There could be more things wrong with it, but my suggestion is to take the shortest route possible f ... |
14-8-2008 at 11:47
by: len1 |
Home chemist raided in MA, lab seized.
I think some people might have missed the point that people too ignorant to know when a situation po ... |
13-8-2008 at 20:47
by: len1 |
Home chemist raided in MA, lab seized.
[quote]Pamela Wilderman, the code enforcement officer for Marlboro, stated, “I think Mr. Deeb has ... |
13-8-2008 at 14:28
by: len1 |
Toxicity of phosgene
Yes thanks, Ive already got that on.
What you get out of doing experiments is actually intimate k ... |
9-8-2008 at 21:26
by: len1 |
What reagent would you like to see an illustrated guide for?
Thank you everyone for the suggestions. I decided to start with the following
1) potassium via c ... |
9-8-2008 at 19:41
by: len1 |
Toxicity of phosgene
Ive yet to hear of anyone harmed by talking about phosgene. Its a perfectly safe compound for 95% o ... |
9-8-2008 at 16:32
by: len1 |
A TCCA chlorination safety warning
[quote][i]Originally posted by Nicodem[/i]
Come on! You surely do not believe that silly estimation ... |
7-8-2008 at 21:11
by: len1 |
A TCCA chlorination safety warning
Its interesting to have a look at exactly how much NCl3 or ClO2 must have been present to be equival ... |
6-8-2008 at 20:56
by: len1 |
A TCCA chlorination safety warning
Yes - I read what you wrote, but there would not be the equivalent of 5-10gms lead azide in the vapo ... |
6-8-2008 at 03:08
by: len1 |
A TCCA chlorination safety warning
I find this story bizarre for several reasons.
First the distillation was done 3 times, and the ... |
6-8-2008 at 02:19
by: len1 |
GBL: 600 raids in Germany, Austria, Switzerland
That link was of course made in the long post above, and there is a validity to it - where does an a ... |
4-8-2008 at 14:29
by: len1 |
GBL: 600 raids in Germany, Austria, Switzerland
I think todays Germany has got most things right. If its worried more about lowly unemployed than f ... |
3-8-2008 at 19:21
by: len1 |
GBL: 600 raids in Germany, Austria, Switzerland
Theyve leap-frogged us. Here KMnO4, H2O2 are still perfectly fine. Pity - I found them very trusti ... |
3-8-2008 at 05:27
by: len1 |
If water absorbs infrared, how come pools don't get hotter?
Thanks for the graph not_important. I will however have to disagree on its interpretation.
First ... |
2-8-2008 at 00:51
by: len1 |
If water absorbs infrared, how come pools don't get hotter?
[quote]The above ref. is also recommended to all global warming nuts. After all, H2O is the chief gr ... |
1-8-2008 at 10:49
by: len1 |
What reagent would you like to see an illustrated guide for?
[quote][i]Originally posted by Ephoton[/i]
yep im with K nice one. make it real pure please.[/quote ... |
1-8-2008 at 10:29
by: len1 |
What reagent would you like to see an illustrated guide for?
Thanks once again for the very interesting suggestions. I particularly like something that has an i ... |
1-8-2008 at 01:09
by: len1 |
Drying oxalic acid
How about drying in a sealed dessicator in an oven at 80-90C (to speed up the kinetics) over conc H2 ... |
29-7-2008 at 16:54
by: len1 |
What reagent would you like to see an illustrated guide for?
Thank you very much for your suggestions. Surprisingly the list of preliminarily ideas I jotted dow ... |
29-7-2008 at 14:44
by: len1 |
Electric motor driven alternators for high amp 6V current..
[quote][i]Originally posted by 12AX7[/i]
[quote][i]Originally posted by len1[/i]
To rephrase how d ... |
28-7-2008 at 23:20
by: len1 |
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