Are there any simple methods for creating pulsed DC without expensive equipment?
Howdy jadaro2600,
I just couldn't resist this one. Two bare pieces of wire touched together intermittently. Telegraph Key. Doorbell switch. Frankenstein's Knife Switch. Dog chasing a squirrel tethered to a circular run upon which a cam periodically closes a momentary switch. Frequency is determined by the fatigue level of the dog and disposition of the squirrel. Hahhahahahahaaahahahahhaaa.....
Seriously, there a bizillion ways to modulate DC power. Since you are new to Overunity.com lets start with the D14...
http://freenrg.info/Hydrogen/D14_Dave_Lawton_Circuit.pdf
http://freenrg.info/Hydrogen/D14_Updated_Dave_Lawton_Circuit.pdf
http://peswiki.com/index.php/OS:Water_Fuel_Cell
Blessed Be Brothers...
Hmmm ... Yes there are ;D
U need to turn direct current on and off.
Thankyou for your replies;
I will look at the 555 timer circuits.
I should be more specific though, what about any easy ways to create pulsed DC from preexisting AC?
Hi jadaro2600,
If you know your way around electronics, I would say get a small 75w (about $10 on Ebay) or 100w+ 12v ($20) inverter in an aluminum housing that runs cooler. Rectify the output and you have pulsed DC. You can mod the circuit to make it more reliable and other tweaks are also available online. You can use it to drive magnetic motors more efficiently (except for the Newman design which does not benefit from the pulsed input) or crack water with better results. High voltage precludes a higher safety factor in experiments. Play it safe and protect yourself and others by using a safe working procedures and equipment.
You would get a 160v-170v pulsed DC output cheap.
Hope this helps,
Michel
Howdy Y'all,
Take a look at this.
http://www.aaroncake.net/circuits/inverter.asp
I built this circuit to pulse one of my transformers. It's a neat little circuit and may be good for an HHO application...
Blessed Be Brothers and Sisters...
It is excellent for hydrogen. It is also very good to drive different magnetic motors. And the best, it is cheap. They need a few small gut mods for the production of hydrogen.
Take care,
Michel
AC and DC are different stuff.
For example Ac got frequency. How you will increase frequency ?
U need to get familiar with basic electronics. Power supplies and so on .
Simplest way to get pulses out of AC is to smooth it to DC. Full bridge (diodes) and some smoothing elements like parallel capacitor (not effective)
Howdy Y'all,
That circuit I posted isn't really AC. You get transformed square wave DC pulses out. The description of the circuit is not very good, and the circuit doesn't generate a sine wave so the circuit is not very effective as a inverter, but it can give you alternating DC pulses. I built it and looked at the waveform with my oscilloscope.
Blessed Be Brothers and Sisters...
I tired to rectify AC into two channels of pulsed DC with poor results, I'm using the IN400x series of 1 amp rectifier diodes. Can someone explain what diodes would best serve the purpose for rectifying ac signals from an audio amplifier?
What I did in my experiment was split an AC to DC rectification circuit which uses 4 diodes straight down the middle with diodes on the left in their normal positions and diodes on the right in the same clockwise positions as the ones on the left - I used pulsed DC from each half of the sine wave...
My primary concern is the type of diode to be used. The setup did produce bubbles, but not very many - apparently, when I set it up, the diodes all had different properties. The diagram below shows basically what I did... Red dots indicate the electrodes, purple indicates the AC source, black lines are the circuit and the green arrows indicate the basic direction of flow.
Another idea - just for basic testing could be a self-switched relay.
just put the coil in series with an opener switch of the relay, put a
capacitor - some uf in parallel to the coil and feed power via some
ohm series resistor. By tuning the input voltage you get a nice
multivibrator which can handle lots of voltage and power on the
remaining switch of the relay.
This works up to some hundred Hz - yes - the relay will die some day.
rgds.
Howdy jadaro2600, and Fritz,
jadaro2600, what are you using for a driver?
Fritz, just found this circuit recently. Apparently its really old, doesn't get used much anymore...
Blessed Be Brothers and Sisters...
Well, for ease of use, i've got a hobby transformer normally used to power a train set. It's rated at 17 vdc / 20 vac with 7va total output.
Quote from: z.monkey on August 12, 2008, 06:31:30 AM
Howdy Y'all,
Take a look at this.
http://www.aaroncake.net/circuits/inverter.asp
I built this circuit to pulse one of my transformers. It's a neat little circuit and may be good for an HHO application...
Blessed Be Brothers and Sisters...
Error in Circuit.
The Cap?s C1 C2 are designed in the wrong polarity, can blow up and not work.
This design is since years wrong in the WEB. Pleas revers the Polrity. + to Collector and negative side to the base
(gate) of transistor.
Pese
hehe,
Couldnt describe it better;-))))
Now you know what I do if Im very idle in my lab,
no crazy noise, only some relays.
I cannot throw them away until they?re _DONE_
really like this circuit.
You can even make unsymmetric operation if you add
a diode - or use the open end of the self opening switch
to shorten the coil thru a different additional resistor.
You even can shorten the remaining lifetime if you switch
additional coils ..... but thats really off-topic now.
Howdy Y'all,
Pese, yeah I did have to flip those caps over. They got hot and I blew up one. Let the magic smoke out...
Fritz, there is nothing like an oscillating relay, buzzz....
jadaro2600, that is roughly 7 watts so at 17 VDC That is around 400 mA. You need mo power. See if you can find a car audio booster. Use a audio tone generator, feed it to the audio booster, then run the output into your rectifier circuit. If not that then you can always build a protoboard circuit to run the electrolyzer.
Blessed Be Brothers and Sisters...
A really simple way i would of thought, for testing purposes only, a small electric motor on its on power with a controller so you can adjust the speed at which it rotated... then just a disk for connections. you can adjust the speed the amount of connections the size and or length of the connections ect ect... simple efftective... CHEAP you can adjust everything.
i beleive we can do it using relay set as a vibrator mode.
otit
I understand that real a PWM's effectiveness arises out of the
sharpness of the rise and fall. I suspect that, on an oscilloscope,
the relay method will give a "Mars bar" like shape, rather than
properly vertical rise and falls.
Paul.
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.
A Meisner (or Armstrong) setup uses a pickup coil to switch a transistor. Theoretically this is an automatically self tuning resonant pulse frequency generator.
Since it seems like a lot of experts have posted on this thread, I'll pose the question -- can anyone figure out a way to incorporate the Meisner circuit into their DC pulsers?
I have a diagram on the previous page; rather than using my hobby transformer for an ac source, I used an analog stereo receiver for the source. It puts out about 60 volts and around 1.3 amps at max volume.
Using this source and the sound card's ability to create various signals, the range is the only limiting factor. Using Audacity, or some other electronic tone generator should / has been / my source of ac power. IT allows square waves, and cutting the ac in half create a type of pulsed dc.
Also, adjusting the DC offset in the tone signal may have the same effect.
The cheapest way I know would be to use the audio output from a car radio.You already have millions of car radios out there.Of course different sounds would have different outputs.triffid
Think about it,the audio output from a car radio is DC at varying frequencies.It's also constant current output.Triffid
audio (1-20,000 hz.)Triffid
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
Quote from: Farlander on January 01, 2009, 06:42:35 PM
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.
Quote from: pese on February 06, 2009, 01:24:13 PM
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.
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"!!! :) )
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 (http://www.overunity.com/index.php?topic=5350.msg120937#msg120937)
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
Quote from: triffid on February 10, 2009, 02:44:03 AM
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!!!....
I'm not entirely sure how this works or what you mean by pulsed dc coming from a solar cell put under a florescent or incandescent light.
He means that a solar cell outputs straight DC under the sun, but fluorescent lights flicker at 60hz, too fast to detect by the human eye, although a common cause of building sickness, especially in Europe where grid power is 100hz.
Solar panels are designed to emit straight dc, there is no A/C rectifier in solar cells, and definitely not at 60hz...
In the experiment I did I used a single solar cell each time (about 5 times),I did hear a 60hz hum each time. But never used a solar panel.I can only say try it and see what happens.I put a solar panel on my kitchen floor one night under fluorescent lights and got about 9 volts on a voltmeter.But I did not think to hook a speaker up to it.If you get a hum out of it you are getting pulsed DC(sinewave only).Good luck.Triffid
I only used fluorescent lights in my experiments.No others!Triffid
I had a thought,if solar panels don't work here ,you could always hook up 3 regular solar cells or more in series to get the voltages you want.Triffid