How to create pulsed DC?

[jadaro2600]

IMHO Creating pulsed DC is only the first step.  There are brute force electrolysis guys out there who use PWMs to control heat, but I think we should be interested in attaining and sustaining resonant pulse frequency.

I've seen those electrolysis chambers, they use stainless steel - which corrodes; it becomes hard to tell if the majority of production is gas or steam.  When the electricity starts to flow through it, it gets hot - to the point of boiling the water at the surface of the electrode.  Using a graphite electrode and electrical energy is what they use to machine parts in some machines, EDM machining they call it.  They ground the part, submerge it in water, and introduce the electrode to it and it vaporizes the metal it comes near - all particulates are then filtered out and you get this highly precise part which is a dingy grey color.  This is essentially brute force electrolysis in action to create high amounts of corrosion in specific places.

The idea here is that they use graphite in some machines, and brass in others.  The fact that we haven't got a lot of replicators using graphite is odd, it won't corrode like the stainless steel will and it's perfectly re-usable.

The idea would be to create a low temperature, high yield pulsed dc frequency - some mock at being 42.8khz ..somewhere near the higher end of an audio production device.  In order to create a pulsed dc at that frequency, you would have to generate an AC source twice that and half-wave rectify it.  ..and this would be just half wave, so on again off again.  THe idea with pulsed DC is that you could say, rectify only 1/3 of the wave,, so that 2/3 of it's amplitude goes in one direction and 1/3 in the opposite.

A zener diode comes to mind, but only for a certain range of frequencies and voltages would this work out.

take an speedcontrol from your screw drill

thea are normally 12 volt  (up to 18)
and normal to use up to 10 amps.

te work on about 4000hz.
and your can regulate/vary the duty-cycle
5% on up to 95% on that say : the 12V DC it is pulsed.
Pese

...Now this is a novel idea, I've never though of this.

[CrazyEwok]

Just to throw a monkey wrench in the works... your idea about slicing AC maybe a good way to get you frequency down but it is highly in-efficient when it comes to your finished product as you are wasting half your AC current generated. Which will mean in order to produce the amount of gas you need to be an effective electrolyzer will almost need to be double that of if you use both sides of the rectified AC. (Bottom half on one set of electrodes top set on annother). You will need a way to control your frequency, accurately. In all the information i have seen and read on the net and in the lab sinewave works better than squarewave but is harder to generate the right variables. Don't listen to me though, this is a highly experimental area and no-one can claim they know whats the what yet (except IH and a few others in particular areas)
Good luck and keep the build going (even after you blow it up and your misses threatens to leave if you keep building these "contraptions"!!! )

[jadaro2600]

These things were a matter of observation - they were not meant to be the standard.

I was pointing out that AC is it's own monster while DC it yet another.  Having a conversion from one to another creates losses no matter what.  If you look on page one, I've got a post where you utilize both sides of the AC waveform; using rectifiers and four electrodes, pulsed DC is created across two of the electrodes at one point in the wave and across the other two in another.  The rectification would essentially cause a magnetic field in the solution that rotates?

http://www.overunity.com/index.php?topic=5350.msg120937#msg120937

[triffid]

Years ago at my first job.I brought a solarcell and an earphone to work .Put it under the fluorescent lights and I heard a 60 hz/sec hum out of it.That tells me that the solar cell was putting out dc at 60 hz/sec sinewave.You could put a whole solar panel under the flourescent lights inside a building to get more voltage.Of course you are only limited to 60hz .triffid

[CrazyEwok]

Years ago at my first job.I brought a solarcell and an earphone to work .Put it under the fluorescent lights and I heard a 60 hz/sec hum out of it.That tells me that the solar cell was putting out dc at 60 hz/sec sinewave.You could put a whole solar panel under the flourescent lights inside a building to get more voltage.Of course you are only limited to 60hz .triffid

you will also find that your light is also 60hz... your simply collecting 60hz of power at 60hz... GENIUS!!!....