Originally posted by Spokane1
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In reality, it is easier for circuit B to work if there is also a diode from the front side capacitor to the top of the ignition coil as well - but not always necessary. The plasma burst does a better job of giving sufficient ionization of the gap for the cap in parallel to discharge over the gap.
But I have found on my experiments that if the cap is charged to a high enough voltage, a regular CDI discharge without that diode on the front side will work just fine in allowing enough ionization at the gap to allow the parallel cap to discharge.
Here are actual scope shots comparing with and without a diode.
I'll repost it here:
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diode increases HV cap discharge speed
I'm reposting these messages from Greg - from the Water Sparkplug thread. I thought Lee posted the first scope shot on this but I guess it was Greg. This shows that with the diode, the discharge from the cap increases to virtually instantaneous...you can see this clearly.
A great majority of the cap discharges instantaneously (straight line coming down) then it slows towards the end. Without the diode, it is a slower steady discharge over time.
Here is with the right circuit:
YouTube - Gray Tube Test
It is definitely not a "hv spark" and when the grid is connected, this is what popped a magnet from the coil.
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gmeast
Senior Member
Join Date: Aug 2008
Posts: 381
The Effect's Signature!
Hi everybody,
I have now configured my Water Spark Plug circuit to trigger off of the line sine wave. That means that the circuit is operating at 60 Hz. It was only after I got it running this fast was I able to connect the characteristic "SNAP" or "CRACK" with the oscilloscope trace. I will post a video that will show the signature wave form appearing and disappearing in synchronization with the characteristic sound as the circuit misses an occasional beat.
But first I will show you the O-Scope traces. You have already seen them if you viewed my last video. The attachments below are the scope captures that appeared in the video. The Cap discharge trace with the 'crook' in it was thought to be the trace where the HV diode is merely included in the circuit (which it is), and the 'smoother' trace is without the HV diode (which it is). But further, however, the trace with the crook in it IS the signature of the effect ... or more clearly ... the CROOK itself IS the signature of the effect.
This is all very exciting! I will compile the video as quickly as I can so you all can see that the effect actually has a 'face'.
Thank you. Peace,
Greg
Attached Thumbnails
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gmeast
Senior Member
Join Date: Aug 2008
Posts: 381
new video of signature trace
Hi all,
As I said I would do in a recent reply, I have posted a new video showing the unique wave form characteristic of the water spark plug circuit discharge cycle. Please note the time period in the video is 250u-sec per division so the signature is not casually apparent. My new Gotoluc-Lindemann circuit version operates at 60 Hz and is powered by two Mosfet packages triggered by integral opto-isolated inputs. These inputs are excited by two external resistor divider networks phased 180 deg. from each other via the full bridge rectifier. At present I am still limited to lower voltages and currents by the inrush ratings of the Mosfets. I will be reverting to triacs for the generator set tests however. They have an 800V rating.
The new video is located here:
YouTube - sgnature trace
Thanks. Peace,
Greg
)))
Aaron I think you made your point.


So you claim in recent posts mine isn't like Gray's...yet it is...yet it isn't...yet it is...yet it isn't...yet it is... 
I'm starting to see a pattern...
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