PWM circuit 555

[crowclaw]

@Artic_Knight

I had an experimental HHO system installed in my car approx 2 years ago. The cell run from a PWM controlled high voltage 10amp boost converter.
Basically it was driven via a 555 timer chip which varied the pwm output as the vehicle revs increased to increase the hho feedback system from the MAF. I used IGBT devices as output drivers to the cells. The project was successful in as far as the mpg was concerned. I used ordinary tap water with no additives. I later removed the system to comply with insurance regulations (vehicle mods) and abandoned the project. Somewhere in all the clutter of papers I may still have the schematic of the pwm front end... if you are still experiencing difficulty PM me and I'll try and locate... although your quires  may have been answered already. Best of look with your project.

[Artic_Knight]

thanks crowclaw.

my issue with the 555 was not getting frequencies but preventing it from overheating. it appears the pin 4 or i believe its reset pin was the cause. after pairing it with 8 or the vcc pin and adding a 1k resistor i managed to keep the chip at a nice cool temp to the touch.

i have a different idea for frequencies and will not be aiming for any specfic freq but looking at a setup to use changing frequencies.

on a side note my electrodes are aluminum and are working the same if not better than stainless steel! i have the white coating in one night, oxidation doesnt seem to be an issue like others mentioned it might be. i origionaly tested on razorblades and for a same given environment i seem to get better production for less mah. at this time i have been testing at 100 mah.

thanks all!

[Paul-R]

My issue with the 555 was not getting frequencies but preventing it from overheating.

This should not be happening. Are you running more volts in than it says on the packet?
http://www.fairchildsemi.com/ds/LM/LM555.pdf

If not, maybe you mention this problem to them:
http://www.fairchildsemi.com

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By the way, have you seen this spreasheet for getting the 555 frequency?
http://www.free-energy-info.co.uk/CALC.XLS
(You will need Excel or the OpenOffice equivalent)
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[Artic_Knight]

well my 555 chip came from radio shack part number 555cn. and sure enough when i ran a 1k resistor between the batteries and pins 4 and 8 (together) the heat stopped. it was not overheating in a way that seemed to damage the chip or cause negative side effects but I wouldnt leave my finger on it longer than a couple seconds i was using 6 volts and this generated the heat. i have now scaled up to 10 volts (i use aa battery packs) with no heat after adding the resistor.

i did try 42.8khz just for giggles tonight and didnt notice any change in production. however i will say this, my circuit has been using 90mah and producing what might be (havent done a volume test) 1 liter per hour. 

i keep R2 as they referr to it (the resistor to pin 7 and cap) at a low 2.2k to 1k so my pulses are mostly voltage and raise resistor 1 or the resistor coming more directly from battery to control frequency.

my bubbles are a fine mist and with a dab of baking soda (3 pinch at most) per half liter water im getting very cloudy water.

i had to be careful conditioning my plates in plain tap emptying water once an hour since im using aluminum but there is an unusual effect, the oxygen plate only got slightly spotted or maybe its pitted before the hydrogen plate got a white coating. now the production has increased (only barely noticable to naked eye) and further darkening or pitting of the plates appears to have stopped altogether.

i conditioned my plates for a total of roughly 12 hours. the first 2 developed the white coating and since there has been no noticable change.

right now my plates consist of 2 small strips of aluminum dangling in a cup of water.  my dry cell is only partially completed but when its done i expect to see a extreamly effecient cell. im contributing this to the use of aluminum but will need to see how long it lasts before i dedicate myself to this metal. it does appear to be better when compared to youtube videos but without proper cell and measurements at this time i really dont have much to go on except an opinion.

has anyone else worked with aluminum? i seen one mention of it in this forum but didnt see much more.

stay tuned. more updates will follow as progress continues

[Paul-R]

my bubbles are a fine mist and with a dab of baking soda (3 pinch at most) per half liter water im getting very cloudy water.

Nobody recommends baking soda because it has no special benefits
and gives off carbon monoxide as a by product.

Try Sodium hydroxide in a weak solution. (aka Lye, caustic soda).