Water Sparkplug

[topangler81]

don't see anything

i tried to upload the schematic but some error massage came out that says invalid address

[Jetijs]

Maybe the file is too big. Users usually try to upload a large BMP file directly from paint, try to save the file as .JPG

[topangler81]

Battery exploded

Im using an old version of nexus arc generator schematic in water spark plug pdf from panacea university. I changed the rectifier diode to full wave rectifier diode rated 15amp. MOT was changed with a transformer that only connected at the primary 12volt side. Hot wire connected to the transformer, and diodes string at the N terminal. Capacitor connected after the bridge rectifier before transformer. The L terminal connected directly to the spark plug. N terminal connected to the spark plug kathode. Hope u all understand

[Jetijs]

Sorry, still not clear

[topangler81]

Sorry, still not clear

ok i will sent the schematic later. Sorry.

[topangler81]

Hope this will help. Sorry about poor drawing.

[Jetijs]

Ok, I understand now.
If your high voltage output from the ignition coil of positive or negative polarity? I would lose the inductor and put the diode string on the positive line and the other way around Did you use this on a running car or on a bench setup?

Here is what I am using and what has worked well so far:


But this is used only if the HV output is of positive polarity.
Hope this helps.

[topangler81]

How to tell that the car run at negative or positive hv. When i put the diode string at negative side without inverter and capacitor the spark plug fires, when i put positive side spark plug not firing. Is my hv negative? May be i was wrong.

[Jetijs]

Do like this:


If you put the diodes like in the upper part of the picture and there is no spark, then your HV is of negative polarity, if there is a spark, then your HV is of positive polarity

[topangler81]

Do like this:


If you put the diodes like in the upper part of the picture and there is no spark, then your HV is of negative polarity, if there is a spark, then your HV is of positive polarity

i think my hv is negative since i connected the spark plug at the negative of diode. Like in the diagrams. The oscillator diagram that you used very simple. What are the part no of transistor that you used?

[Jetijs]

The NPN's were 2N3055 and the PNP's can be any moderate power PNP transistor that you have laying around.

[topangler81]

very simple oscillator circuit. at the circuit can i use an old 12v to 240 transformer? i think want to use it in reverse so it can produce 240v. and also ignition coil produce an high voltage, is 15 of 1N5408 enough to block the high voltage?
you using 15 diodes per spark plug of just one string to all 4 spark plug. sorry lots of questions i ask. just to make sure.

[Jetijs]

I think you can use your transformer, but see if it works on higher than 50/60Hz frequency. I had a problem one that my oscillator eas working on about 4KHz, but the output could not handle a load more than 10W. Turned out that the problem was the too high frequency. A transformer from an old UPS should work fine at higher frequencies. A string of 15 diodes in series should be enough if the gap between you spark plug electrodes is not bigger than say 2mm. And you need one 15 diode string for each spark plug. You can also use microwave diodes, this saves a lot of space, they handle 12kV at 500mA.

[topangler81]

i think that i will use larger capacitor value to reduce the oscillating frequency. now i using 65 diodes on my diodes string. hope this will not exploding the battery again

[topangler81]

I think you can use your transformer, but see if it works on higher than 50/60Hz frequency. I had a problem one that my oscillator eas working on about 4KHz, but the output could not handle a load more than 10W. Turned out that the problem was the too high frequency. A transformer from an old UPS should work fine at higher frequencies. A string of 15 diodes in series should be enough if the gap between you spark plug electrodes is not bigger than say 2mm. And you need one 15 diode string for each spark plug. You can also use microwave diodes, this saves a lot of space, they handle 12kV at 500mA.

is larger gap need more diodes or less?