Tweet
I have been working on the design for some time, but when I posted I thought I had finished the schematic.When I went to layout the pcb I realized there was no point in certain bits and some of the footprints where wrong so made some quick changes to schematic then finalized pcb, now I need to build pcb, progamme pic controller, build coils, and test. If results are obtainable then this should do it, as the components used are capable of higher speeds than most I have seen in previous schematics, and the control over tuning will be constantly and automatically updated, but I think there is much to do before I can tell you if I am getting good results! questions are welcome, I don't understand everything that these guys are doing but as I see it the biggest two tricks are bucking coils stealing big time from nano pulses with possibly some nmr going on with the ferrites and or copper in some cases but I dont think all the coils are so nessesary just check the 2 wesley video's on tuning for resonance where the guy uses a 24v 2amp (48w) out psu and seemingly lights a 200 watt bulb using a large diameter small turn primaray coil and smaller diam many turn secondary I guess most of you have seen this paper by chris sykes http://hyiq.org/Downloads/Guidelines...ng%20Coils.pdf if not you should check it out before going any further, to get good results with nano pulsing in my opinion a good mosfet driver is imperative unless you know how to design low loss turn on/off circuit with little capacitance and probably use logic level mosfets , as it is hard to get the fast rise and fall with enough amps to switch the mosfet sufficiently. I have noticed that there is wasting going on in many of the working circuits in the form of snubbers or protection diodes, if you study my mosfet coil driving circuit you will notice I have eliminated that with the diode arrangement it also utilizes the back emf as usefull coil driving power. Instead of splitting the primary and feeding each half alternately I am driving it one way then the other by use of high and low side mosfets with a diode arrangement that eliminates the need for snubber or protective diode and uses the back emf for next cycle. I have used a lot of ground plane around the most important areas to avoid stray cross over capacitance / inductance and kept everything tight to avoid inductive/capacitive leeks which is quite important at these high frequencies / short duty cycles. it is probably a good idea to screen the headers aswell with earth (not shown in circuits) an insulated earth going with each header should sufice. I have always been a giver and not likely to change now at 53 even though people don't often return the jesture, hence why I am still scraping for pennies, don't be fooled by the laird part of my user name, it was a novelty gift (1 square foot of land at dunans castle scotland and a certificate with the title laird 
) If anyone is going to build the boared I suggest getting a copy of multisim and ultiboard to figure out where the vias are, There are 10 of them connecting tracks on top side of board to bottom side although it could be worked out by studying the circuit schematic, and 11 on the thermal pad of the mosfet driver for heat transfer. The use of two mosfets from each gate drive is not such good practice as a slight difference between the two transistors can cause one transistor to do most of the work but the driver chip can drive up to 6 amps so this may reduce heating problems. I have not designed the mosfet board yet just the oscillator/nanopulser/driver but when I do the amount of copper to each gate should be equal and symetrical like mosfet-T-mosfet if you get what I mean so there is equal copper resistance to each mosfet. I really cant see how breadboards and long wires can work when such high speeds and acuracy is requird, yes the circuits will kind of do what they should but there will be waste and stray oscillations. We don't eat with the shovel we use to scoop dog poop ... do we? damn no wonder I have sore stomach
anyway Mikey your 
looking forward to some feedback! Not sure if all attachments will show. I have tried to attach the actual multisim file(.ms13) and the snippet as before, which can be imported to multisim. The circuit data is stored in header of png then the ultiboard file and exported dxf .. good luck peace and love
Andy
) If anyone is going to build the boared I suggest getting a copy of multisim and ultiboard to figure out where the vias are, There are 10 of them connecting tracks on top side of board to bottom side although it could be worked out by studying the circuit schematic, and 11 on the thermal pad of the mosfet driver for heat transfer. The use of two mosfets from each gate drive is not such good practice as a slight difference between the two transistors can cause one transistor to do most of the work but the driver chip can drive up to 6 amps so this may reduce heating problems. I have not designed the mosfet board yet just the oscillator/nanopulser/driver but when I do the amount of copper to each gate should be equal and symetrical like mosfet-T-mosfet if you get what I mean so there is equal copper resistance to each mosfet. I really cant see how breadboards and long wires can work when such high speeds and acuracy is requird, yes the circuits will kind of do what they should but there will be waste and stray oscillations. We don't eat with the shovel we use to scoop dog poop ... do we? damn no wonder I have sore stomach anyway Mikey your looking forward to some feedback! Not sure if all attachments will show. I have tried to attach the actual multisim file(.ms13) and the snippet as before, which can be imported to multisim. The circuit data is stored in header of png then the ultiboard file and exported dxf .. good luck peace and loveAndy
beer is far safer for drinking
Comment