My theoretical knowledge of electronics are zip, have built a couple of kits/projects, thanks for your help I really appreciate it.
Can see in your circuit the switch off time is also faster than the original circuit
This is the original text from the document regarding the circuit I built:
For anyone interested in doing further experiments, the circuit diagram of a second, very simple prototype of my pulser is shown in (Fig.5, posted above). The input is a simple TTL square wave at the frequency of interest. The circuit consists of two simple buffer/inverter stages, around transistors TR1 and TR2, to translate the TTL signal into a larger voltage swing to drive the two parallel MOSFETs in the output stage, shown combined as TR3, into hard conduction. The MOSFETs are wired in parallel to increase their current capability and mounted on a big heat sink, although they have a very low on-resistance and so the dissipation of the circuit is low. The 20V Zener diode, D1, wired from the drain to gate of the MOSFETs prevents inductive voltage overshoot and gives the MOSFETs a very hard switch off edge, which is supposed to be ideal for bioactive effect. The power supply is a simple 21 volt unregulated supply (a rectified 15V a.c. transformer with a 4700µF smoothing capacitor) but which needs to have a high surge capacity as the transients generated by the coil can overload the transformer and rectifier. The second prototype uses a 200VA transformer and 10A rectifier which works well. My first prototype used only a 100VA transformer and died suddenly in a cloud of smoke!
This is the description of the coil: The coil, L1, consists of approx 333 turns of 22swg enameled wire wound on a plastic former of about 13cm diameter (a standard plastic waste pipe coupler) in eight layers, across a span of about 25mm. The turns of the coil need to be tightly wound and well varnished into place to prevent oscillation and heating in operation. The prototype coil gets mildly warm in normal use, about 40°C.
Hope it does make sense to you?
If you have a beter designed circuit that I can build, I will not think twice doing it; should I go with your circuit (posted)? and give you feed back.
Thanx
Virus