The closest I can get to figuring out how to do this would be the following:
3 power pulse modulators and a center tap transformer (see here: http://www.rmcybernetics.com/tutorials/pwm-bipolar.htm). The two PPMs and transformer that they describe gives you the HFAC. The third would give you the dead space (I think). See the description at the bottom of the article. Anyone see any problems with this, or is there a simpler way? It is kind of an expensive solution. On Thu, Nov 22, 2012 at 6:09 PM, Jack Cole <jcol...@gmail.com> wrote: > I see your point Jeff. > > I did use the oscilloscope to figure out the minimum pulse width > attainable by the IOIO board I am using with my Android phone. It will go > down to 65 ns. > > Arnaud (or anyone who can answer), > > So if I understand correctly, you could use a PWM pulse with an H bridge > to get AC from a PWM signal? I think I looked into this before, and the > problem would be that you wouldn't have the "dead space" in the current. > Let's say you have a 100 ns + current and when this is switched off, the H > bridge allows the - current for the remainder of the duty cycle. This gets > you closer, but is still not what is needed. If I understand correctly, > you need a bipolar pulse (then no current in between the pulses). > > > On Thu, Nov 22, 2012 at 4:45 PM, Jeff Berkowitz <pdx...@gmail.com> wrote: > >> You don't need a high speed scope if the circuit is working *correctly*. >> But if it's working correctly, you don't need to measure it at all. ;-) >> The reason for a high speed scope is to observe the behavior when it's not >> working correctly. It's a high-power, high-speed AC circuit, so errors or >> bad construction practices may produces really weird results that simply >> won't be observable with a low-bandwidth instrument. >> >> I wouldn't read too much into the divisions on the scope. The probe and >> scope electronics will act as a low-pass filter, so you'll a smoothed and >> rounded representation of reality. It's not the frequency of the pulses >> that's the issue here, it's the harmonics that compose the rising and >> falling edges of the pulse. >> >> For AC pulses you can look at Arnaud's message. Godes didn't use this >> approach, I think - instead the clever use of T8 as both an inductor and as >> the primary of an isolation transformer; then by suitably referencing the >> secondary side, the core sees AC. I could be misreading the design, >> however. There are four MOSFETs in Godes design. >> >> Jeff >> >> On Thu, Nov 22, 2012 at 1:59 PM, Jack Cole <jcol...@gmail.com> wrote: >> >>> Jeff, >>> >>> I don't think your scope would need that level of resolution. Godes >>> describes using the following: A 100MHz Fluke 196C oscilloscope meter. >>> >>> Anyway, there is not a lot of info on the net about using PWM to make >>> bipolar pulses. Producing a DC pulse to those specs is not so difficult. >>> A bipolar pulse seems to be a different story. >>> >>> I have a 25mhz oscilloscope, so I'll try to see if it has the resolution >>> needed. Supposedly, it will show down to 5 ns/div on the horizontal axis. >>> I'll try to experiment to see if I can get a 100 ns DC pulse with PWM and >>> see how the scope does. >>> >>> Here is the scope I have. >>> http://www.amazon.com/dp/B007T6XNCA/ref=pe_175190_21431760_M3T1_SC_dp_1 >>> >>> Jack >>> >>> >>> On Thu, Nov 22, 2012 at 3:38 PM, Jeff Berkowitz <pdx...@gmail.com>wrote: >>> >>>> Interesting. A U.S. nickel is 1.95mm thick. >>>> >>>> >>>> On Thu, Nov 22, 2012 at 1:21 PM, James Bowery <jabow...@gmail.com>wrote: >>>> >>>>> It's hard to know where to begin here but let me just say this that >>>>> given the speed of sound in >>>>> nickel<http://www.olympus-ims.com/en/ndt-tutorials/thickness-gage/appendices-velocities/> >>>>> : >>>>> >>>>> 5630m/s >>>>> >>>>> and 430kHz: >>>>> >>>>> 5630m/s;430kHz?mm >>>>> >>>>> ([5630 * meter] / second) * (430 * [kilo*hertz])^-1 ? milli*meter >>>>> = 2.0838194 mm >>>>> >>>>> In other words, a 2mm electrode should exhibit resonance at ~430kHz. >>>>> >>>>> >>>>> On Thu, Nov 22, 2012 at 2:47 PM, Jones Beene <jone...@pacbell.net>wrote: >>>>> >>>>>> On the contrary James, at least two of us did look closely at this >>>>>> possibility [electrode acoustics]. **** >>>>>> >>>>>> ** ** >>>>>> >>>>>> My associate went to trouble to find and download a mpeg sound file >>>>>> of a bicycle bell of the same general size as Davey’s, and plugged it >>>>>> into >>>>>> a program for this kind of analysis – in fact it is dedicated bell >>>>>> analysis >>>>>> software that has proved very accurate for electrodes in the past. The >>>>>> natural acoustic of this hemisphere are nowhere close.**** >>>>>> >>>>>> ** ** >>>>>> >>>>>> The main freq is 4,445.5 Hz, with some sub harmonics, the lowest >>>>>> being around 521/545 Hz, but those are so faint as to be discarded. >>>>>> Higher >>>>>> harmonics are barely above noise.**** >>>>>> >>>>>> ** ** >>>>>> >>>>>> Thus, since the acoustics of the electrodes were off by two orders of >>>>>> magnitude over the signature sound, we did not think that electrode >>>>>> acoustics were in any way relevant as an alternative explanation, or >>>>>> otherwise worth pursuing.**** >>>>>> >>>>>> ** ** >>>>>> >>>>>> Jones**** >>>>>> >>>>>> ** ** >>>>>> >>>>>> ** ** >>>>>> >>>>>> *From:* James Bowery **** >>>>>> >>>>>> ** ** >>>>>> >>>>>> As I previously >>>>>> advised<http://www.mail-archive.com/vortex-l@eskimo.com/msg73144.html> >>>>>> :**** >>>>>> >>>>>> ** ** >>>>>> >>>>>> "Look at the acoustics of the electrodes."**** >>>>>> >>>>>> ** ** >>>>>> >>>>>> Since this advice seemed to make no impact on the discourse here at >>>>>> vortex-l, let me expand:**** >>>>>> >>>>>> ** ** >>>>>> >>>>>> Acoustic resonance in the metallic electrodes does have a reasonable >>>>>> chance of bearing directly on the creation of the "nuclear active >>>>>> environment" hypothesized to exist. I don't think I need to expland on >>>>>> list the possibilities here.**** >>>>>> >>>>>> ** ** >>>>>> >>>>>> Moreover, if one looks at the speed of sound in metals, the "430kHz >>>>>> LENR signature" regime corresponds to the thickness of the cathodes >>>>>> frequently reported as exhibiting the phenomena.**** >>>>>> >>>>>> ** ** >>>>>> >>>>>> Need I say more?** >>>>>> >>>>>> ** ** >>>>>> >>>>> >>>>> >>>> >>> >> >
