On Fri, 3 May 2013 15:00:37 -0700 (PDT), dagmargoodboat@yahoo.com wrote:>On May 3, 4:40�pm, Jeroen <jer...@nospam.please> wrote: >> On 2013-05-03 23:23, dagmargoodb...@yahoo.com wrote: >> >> >> >> > On May 3, 3:39 pm, John Larkin <jlar...@highlandtechnology.com> wrote: >> >> On Fri, 3 May 2013 07:30:44 -0700 (PDT), dagmargoodb...@yahoo.com >> >> wrote: >> >> >>> On May 3, 6:14 am, John Fields <jfie...@austininstruments.com> wrote: >> >>>> On Thu, 02 May 2013 17:54:47 -0700, John Larkin wrote: >> >> >>>> As for the caps themselves, it seems lemonade could be made from >> >>>> lemons in that some use could be made of the parametric quality of the >> >>>> dielectric. For instance, that of a tuning element in an oscillator. >> >> >>>> Or, perhaps, a voltage tunable filter? >> >> >>>> A modulator? >> >> >>>> An attenuator? >> >> >>>> But - in your quest for beauty and truth - I'm sure you've already >> >>>> thought of those, at least, but remained silent for some good reason >> >>>> beyond the reach of the rest of us mere mortals. >> >> >>> No, actually, John suggested a parametric oscillator and several other >> >>> applications. >> >> >>> e.g.https://groups.google.com/group/sci.electronics.design/msg/1257d50b73... >> >> >> I still haven't decided whether it's possible to make an unpumped >> >> oscillator based on "negative capacitance" C:V behavior. It's probably >> >> impossible since I don't think anyone has done it. I can maybe use >> >> conservation of energy to prove it can't be done. Pumped parametric >> >> amps and oscillators (using varicap diodes) are old hat; they were >> >> more popular around 1960, when transistors were still slow. >> >> >> I did manage to sumulate a frequency divider of sorts, really a >> >> subcycle parametric oscillator, based on the C:V curve of a diode. It >> >> should work with a ceramic cap, too. But it's still pumped, not >> >> self-oscillating. >> >> >>https://dl.dropboxusercontent.com/u/53724080/Circuits/Oscillators/Sub... >> >> >> This is a classic diode frequency multiplier, but it halves the >> >> frequency instead of doubling it. Conversion efficiency is >> >> impressively bad. >> >> > Yes, very impressively bad. �Looks like fodder for a green grant--it >> > could be sooo much better with just a little invest-mint(tm). >> >> No one said it was useful for energy conversion. > >Which is exactly why it's ripe for green (or green for ripening), so >to speak. > >> It's interesting, because normally non-linearity will only produce >> harmonics, multiples, of the input frequency. This one also produces >> sub-harmonics, at half the frequency in this case, just using a >> single passive non-linear element. > >Replacing John's schottky with a Y5V capacitor gives the same results, >for similar reasons. You can try it with a varactor in LTSpice. I >just made a /3.I used the diode because I didn't have an LT Spice model for a nonlinear cap. I think the conversion efficiency could be less ludicrous if the thing was futzed with some. I just proved that it was possible! There's a sort of circular reasoning, that the bigger the subharmonic voltage, the bigger the subharmonic pumping energy is. So there should be room for improvement.> >The resonant energy reference wasn't entirely frivolous: this circuit >points out pretty well the exact challenges of wireless resonant >transfer in pragmatic detail. With ideal parts, the weak transfer- >coupling isn't a problem since all the un-transferred energy just >sloshes around un-wasted in a perfect tank circuit--there aren't any >ohmic losses. In reality, there are ohmic losses, and that kills it.In theory, one can create an arbitrarily humongous magnetic field by feeding a small amount of power into a resonant tank. But the Q will getcha in real life. Real life kills so many great ideas... -- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
Crapacitors
Started by ●May 2, 2013
Reply by ●May 3, 20132013-05-03
Reply by ●May 3, 20132013-05-03
On Fri, 3 May 2013 21:25:37 +0000 (UTC), Cydrome Leader <presence@MUNGEpanix.com> wrote:>John Larkin <jlarkin@highlandtechnology.com> wrote: >> On Thu, 2 May 2013 18:42:09 -0700 (PDT), George Herold >> <gherold@teachspin.com> wrote: >> >>>On May 2, 6:05?pm, John Larkin <jlar...@highlandtechnology.com> wrote: >>>> On Thu, 2 May 2013 12:31:43 -0700 (PDT), dagmargoodb...@yahoo.com >>>> wrote: >>>> >>>> >4.7uF 6.3V X5R >>>> >dC = -70% @ 6VDC (!!) >>>> > ?http://psearch.murata.com/capacitor/product/GRM188R60J475ME19%23.pdf >>>> >>>> >James >>>> >>>> It's like a tantalum cap rated for X volts, with recommendation to >>>> never use it at X volts. >>>> >>>> (I actually use tantalum caps at rated voltage *if* there's not much >>>> charging current available. Otherwise, X/3 is about right.) >>>> >>>> -- >>>> >>>> John Larkin ? ? ? ? Highland Technology, Inc >>>> >>>> jlarkin at highlandtechnology dot comhttp://www.highlandtechnology.com >>>> >>>> Precision electronic instrumentation >>>> Picosecond-resolution Digital Delay and Pulse generators >>>> Custom laser drivers and controllers >>>> Photonics and fiberoptic TTL data links >>>> VME thermocouple, LVDT, synchro ? acquisition and simulation >>> >>>I've got this audio amp that runs off 15 volts. >>>But I've told people you can stick upto 40V into it. >>>(as long as it doesn't over heat.) >>>The IC's are good to 60V (I think, LM675?) but I've only got 50V tants >>>as bypass C's. I should do a mod to 100V tants. Someone will want >>>more V. >>> >>>George H. >> >> Tants across supply rails are mini-detonators. Current through the >> cap, C di/dt, can ignite them. Use aluminums.Oops, that's C dv/dt>> >> https://dl.dropboxusercontent.com/u/53724080/Parts/Caps/Bang.jpg >> >> https://dl.dropboxusercontent.com/u/53724080/Parts/Caps/Fried_Tant_1.JPG > >they are pretty ungraceful about failure. I'm sort of surprised nobody >makes internally fused tantalums. >I've seen internally fused tants. But if it shorts, it doesn't catch fire, but it's still a failure. Polymer tantalums, niobium caps, and polymer aluminums don't detonate. I really like polymer alums. -- John Larkin Highland Technology, Inc jlarkin at highlandtechnology dot com http://www.highlandtechnology.com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation
Reply by ●May 3, 20132013-05-03
On Fri, 03 May 2013 18:15:20 -0700, John Larkin <jlarkin@highlandtechnology.com> wrote:>On Fri, 3 May 2013 15:00:37 -0700 (PDT), dagmargoodboat@yahoo.com >wrote: > >>On May 3, 4:40�pm, Jeroen <jer...@nospam.please> wrote: >>> On 2013-05-03 23:23, dagmargoodb...@yahoo.com wrote: >>> >>> >>> >>> > On May 3, 3:39 pm, John Larkin <jlar...@highlandtechnology.com> wrote: >>> >> On Fri, 3 May 2013 07:30:44 -0700 (PDT), dagmargoodb...@yahoo.com >>> >> wrote: >>> >>> >>> On May 3, 6:14 am, John Fields <jfie...@austininstruments.com> wrote: >>> >>>> On Thu, 02 May 2013 17:54:47 -0700, John Larkin wrote: >>> >>> >>>> As for the caps themselves, it seems lemonade could be made from >>> >>>> lemons in that some use could be made of the parametric quality of the >>> >>>> dielectric. For instance, that of a tuning element in an oscillator. >>> >>> >>>> Or, perhaps, a voltage tunable filter? >>> >>> >>>> A modulator? >>> >>> >>>> An attenuator? >>> >>> >>>> But - in your quest for beauty and truth - I'm sure you've already >>> >>>> thought of those, at least, but remained silent for some good reason >>> >>>> beyond the reach of the rest of us mere mortals. >>> >>> >>> No, actually, John suggested a parametric oscillator and several other >>> >>> applications. >>> >>> >>> e.g.https://groups.google.com/group/sci.electronics.design/msg/1257d50b73... >>> >>> >> I still haven't decided whether it's possible to make an unpumped >>> >> oscillator based on "negative capacitance" C:V behavior. It's probably >>> >> impossible since I don't think anyone has done it. I can maybe use >>> >> conservation of energy to prove it can't be done. Pumped parametric >>> >> amps and oscillators (using varicap diodes) are old hat; they were >>> >> more popular around 1960, when transistors were still slow. >>> >>> >> I did manage to sumulate a frequency divider of sorts, really a >>> >> subcycle parametric oscillator, based on the C:V curve of a diode. It >>> >> should work with a ceramic cap, too. But it's still pumped, not >>> >> self-oscillating. >>> >>> >>https://dl.dropboxusercontent.com/u/53724080/Circuits/Oscillators/Sub... >>> >>> >> This is a classic diode frequency multiplier, but it halves the >>> >> frequency instead of doubling it. Conversion efficiency is >>> >> impressively bad. >>> >>> > Yes, very impressively bad. �Looks like fodder for a green grant--it >>> > could be sooo much better with just a little invest-mint(tm). >>> >>> No one said it was useful for energy conversion. >> >>Which is exactly why it's ripe for green (or green for ripening), so >>to speak. >> >>> It's interesting, because normally non-linearity will only produce >>> harmonics, multiples, of the input frequency. This one also produces >>> sub-harmonics, at half the frequency in this case, just using a >>> single passive non-linear element. >> >>Replacing John's schottky with a Y5V capacitor gives the same results, >>for similar reasons. You can try it with a varactor in LTSpice. I >>just made a /3. > >I used the diode because I didn't have an LT Spice model for a >nonlinear cap. I think the conversion efficiency could be less >ludicrous if the thing was futzed with some. I just proved that it was >possible! > >There's a sort of circular reasoning, that the bigger the subharmonic >voltage, the bigger the subharmonic pumping energy is. So there should >be room for improvement.Hmmm, maybe a step-recovery diode or even a PIN diode could do subharmonic generation. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
Reply by ●May 3, 20132013-05-03
John Fields wrote:> On Thu, 02 May 2013 17:54:47 -0700, John Larkin > <jlarkin@highlandtechnology.com> wrote: > >> On Thu, 02 May 2013 18:29:42 -0500, John Fields >> <jfields@austininstruments.com> wrote: >> >>> On Thu, 02 May 2013 15:05:54 -0700, John Larkin >>> <jlarkin@highlandtechnology.com> wrote: >>> >>>> On Thu, 2 May 2013 12:31:43 -0700 (PDT), dagmargoodboat@yahoo.com >>>> wrote: >>>> >>>>> 4.7uF 6.3V X5R >>>>> dC = -70% @ 6VDC (!!) >>>>> http://psearch.murata.com/capacitor/product/GRM188R60J475ME19%23.pdf >>>>> >>>>> James >>>> >>>> It's like a tantalum cap rated for X volts, with recommendation to >>>> never use it at X volts. >>>> >>>> (I actually use tantalum caps at rated voltage *if* there's not much >>>> charging current available. Otherwise, X/3 is about right.) >>> >>> --- >>> Actually, I think what's being commented on is the unexpected >>> tolerance of the capacitance of the cap rather than the cap's >>> likelihood of failure as a function of charging current/terminal >>> voltage. >> >> What we're talking about is whether you can, in real life situations, >> actually use an X volt rated cap at X volts. > > --- > That's what _you're_ talking about, obviously, but everyone else seems > to be discussing the change in capacitance as a function of the DC > voltage across the cap for various dielectrics. > --- > >> Have you appointed yourself to be a net-cop on-topic thread-drift >> enforcer, or do you just try to find a reason to whine about anything >> that I post? > > --- > Neither; I just find it necessary to correct you when you stray too > far from reality, which may account for the frequency of my > commentary. > --- > >> Got anything useful to say about capacitors? Are you even interested >> in capacitors? > > --- > I don't understand your latest ploy - that of painting me as an > uninterested bystander - since even you should be able to see that > it's not working since if I were disinterested I wouldn't be posting. > > At all. > > Poor baby, I think you're just upset because I have no qualms about > pointing out either your egregious errors or your peccadilloes. > > As for the caps themselves, it seems lemonade could be made from > lemons in that some use could be made of the parametric quality of the > dielectric. For instance, that of a tuning element in an oscillator. > > Or, perhaps, a voltage tunable filter? > > A modulator? > > An attenuator? > > But - in your quest for beauty and truth - I'm sure you've already > thought of those, at least, but remained silent for some good reason > beyond the reach of the rest of us mere mortals. > > Have a nice day. :-) >You forgot to mention that they could be used in an artificial transmission line to speed up the leading edge of a pulse ..
Reply by ●May 4, 20132013-05-04
On May 3, 5:53=A0pm, John Fields <jfie...@austininstruments.com> wrote:> On Fri, 3 May 2013 07:30:44 -0700 (PDT), dagmargoodb...@yahoo.com > wrote: > > > > > > > > > > >On May 3, 6:14 am, John Fields <jfie...@austininstruments.com> wrote: > >> On Thu, 02 May 2013 17:54:47 -0700, John Larkin wrote: > > >> As for the caps themselves, it seems lemonade could be made from > >> lemons in that some use could be made of the parametric quality of the > >> dielectric. For instance, that of a tuning element in an oscillator. > > >> Or, perhaps, a voltage tunable filter? > > >> A modulator? > > >> An attenuator? > > >> But - in your quest for beauty and truth - I'm sure you've already > >> thought of those, at least, but remained silent for some good reason > >> beyond the reach of the rest of us mere mortals. > > >No, actually, John suggested a parametric oscillator and several other > >applications. > > >e.g.https://groups.google.com/group/sci.electronics.design/msg/1257d50b7=3...> > --- > I missed those; thanks for the reality check.Sure. I know John--he's not the monster you think. The FLIR stuff in the SMD heatsink thread would be closely-guarded competitive info at other places, not cheerfully shared (with photos) on the web. -- Cheers, James Arthur
Reply by ●May 5, 20132013-05-05
On Sat, 4 May 2013 06:35:47 -0700 (PDT), dagmargoodboat@yahoo.com wrote:>On May 3, 5:53�pm, John Fields <jfie...@austininstruments.com> wrote: >> On Fri, 3 May 2013 07:30:44 -0700 (PDT), dagmargoodb...@yahoo.com >> wrote: >> >> >> >> >> >> >> >> >> >> >On May 3, 6:14 am, John Fields <jfie...@austininstruments.com> wrote: >> >> On Thu, 02 May 2013 17:54:47 -0700, John Larkin wrote: >> >> >> As for the caps themselves, it seems lemonade could be made from >> >> lemons in that some use could be made of the parametric quality of the >> >> dielectric. For instance, that of a tuning element in an oscillator. >> >> >> Or, perhaps, a voltage tunable filter? >> >> >> A modulator? >> >> >> An attenuator? >> >> >> But - in your quest for beauty and truth - I'm sure you've already >> >> thought of those, at least, but remained silent for some good reason >> >> beyond the reach of the rest of us mere mortals. >> >> >No, actually, John suggested a parametric oscillator and several other >> >applications. >> >> >e.g.https://groups.google.com/group/sci.electronics.design/msg/1257d50b73... >> >> --- >> I missed those; thanks for the reality check. > >Sure. I know John--he's not the monster you think.--- Somehow, I think you give him less credit than he deserves. ;) --- The FLIR stuff in the SMD heatsink thread would be closely-guarded competitive info at other places, not cheerfully shared (with photos) on the web. --- Ah, yes... The munificent Larkin gives away what he doesn't care about and then expects accolades and tears for his loss and his time on the cross. Methinks you've been hoodwinked. -- JF
Reply by ●May 5, 20132013-05-05
On Sat, 4 May 2013 06:35:47 -0700 (PDT), dagmargoodboat@yahoo.com wrote:>On May 3, 5:53�pm, John Fields <jfie...@austininstruments.com> wrote: >> On Fri, 3 May 2013 07:30:44 -0700 (PDT), dagmargoodb...@yahoo.com >> wrote: >> >> >> >> >> >> >> >> >> >> >On May 3, 6:14 am, John Fields <jfie...@austininstruments.com> wrote: >> >> On Thu, 02 May 2013 17:54:47 -0700, John Larkin wrote: >> >> >> As for the caps themselves, it seems lemonade could be made from >> >> lemons in that some use could be made of the parametric quality of the >> >> dielectric. For instance, that of a tuning element in an oscillator. >> >> >> Or, perhaps, a voltage tunable filter? >> >> >> A modulator? >> >> >> An attenuator? >> >> >> But - in your quest for beauty and truth - I'm sure you've already >> >> thought of those, at least, but remained silent for some good reason >> >> beyond the reach of the rest of us mere mortals. >> >> >No, actually, John suggested a parametric oscillator and several other >> >applications. >> >> >e.g.https://groups.google.com/group/sci.electronics.design/msg/1257d50b73... >> >> --- >> I missed those; thanks for the reality check. > >Sure. I know John--he's not the monster you think. The FLIR stuff in >the SMD heatsink thread would be closely-guarded competitive info at >other places, not cheerfully shared (with photos) on the web.Not really. What harm does it do me to share this information? Restaurants publish their recipies and cookbooks. Doctors have seminars where they teach one another their techniques. Unions have apprenticeship programs. EEs are paranoid; most won't even show their products, much less discuss the innards. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
Reply by ●May 5, 20132013-05-05
On Sun, 05 May 2013 14:01:34 -0500, John Fields <jfields@austininstruments.com> wrote:>On Sat, 4 May 2013 06:35:47 -0700 (PDT), dagmargoodboat@yahoo.com >wrote: > >>On May 3, 5:53�pm, John Fields <jfie...@austininstruments.com> wrote: >>> On Fri, 3 May 2013 07:30:44 -0700 (PDT), dagmargoodb...@yahoo.com >>> wrote: >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >On May 3, 6:14 am, John Fields <jfie...@austininstruments.com> wrote: >>> >> On Thu, 02 May 2013 17:54:47 -0700, John Larkin wrote: >>> >>> >> As for the caps themselves, it seems lemonade could be made from >>> >> lemons in that some use could be made of the parametric quality of the >>> >> dielectric. For instance, that of a tuning element in an oscillator. >>> >>> >> Or, perhaps, a voltage tunable filter? >>> >>> >> A modulator? >>> >>> >> An attenuator? >>> >>> >> But - in your quest for beauty and truth - I'm sure you've already >>> >> thought of those, at least, but remained silent for some good reason >>> >> beyond the reach of the rest of us mere mortals. >>> >>> >No, actually, John suggested a parametric oscillator and several other >>> >applications. >>> >>> >e.g.https://groups.google.com/group/sci.electronics.design/msg/1257d50b73... >>> >>> --- >>> I missed those; thanks for the reality check. >> >>Sure. I know John--he's not the monster you think. > >--- >Somehow, I think you give him less credit than he deserves. ;) >--- > >The FLIR stuff in the SMD heatsink thread would be closely-guarded >competitive info at other places, not cheerfully shared (with photos) >on the web. > >--- >Ah, yes... > >The munificent Larkin gives away what he doesn't care about and then >expects accolades and tears for his loss and his time on the cross.You're a moron, and a useless moron at that. I care a lot about thermal design: it dominates a lot of high-speed and precision electronics. And what is that "accolades and tears" "time on the cross" nonsense about? I think it's fun to discover things, measure things, and share them and argue about them; it makes the electronics better.> >Methinks you've been hoodwinked.And I think you are a useless, crabby old hen who has almost nothing to say about electronics design, thermal design, component behavior. Do some real electronics and quit cluck-clucking about personalities. It might make you less crabby. How's that Variac experiment coming along? Gonna share it with us soon? -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
Reply by ●May 5, 20132013-05-05
On May 5, 3:55=A0pm, John Larkin <jjlar...@highNOTlandTHIStechnologyPART.com> wrote:> On Sat, 4 May 2013 06:35:47 -0700 (PDT), dagmargoodb...@yahoo.com wrote: > >On May 3, 5:53=A0pm, John Fields <jfie...@austininstruments.com> wrote: > >> On Fri, 3 May 2013 07:30:44 -0700 (PDT), dagmargoodb...@yahoo.com > >> wrote: > > >> >On May 3, 6:14 am, John Fields <jfie...@austininstruments.com> wrote: > >> >> On Thu, 02 May 2013 17:54:47 -0700, John Larkin wrote: > > >> >> As for the caps themselves, it seems lemonade could be made from > >> >> lemons in that some use could be made of the parametric quality of =the> >> >> dielectric. For instance, that of a tuning element in an oscillator=.> > >> >> Or, perhaps, a voltage tunable filter? > > >> >> A modulator? > > >> >> An attenuator? > > >> >> But - in your quest for beauty and truth - I'm sure you've already > >> >> thought of those, at least, but remained silent for some good reaso=n> >> >> beyond the reach of the rest of us mere mortals. > > >> >No, actually, John suggested a parametric oscillator and several othe=r> >> >applications. > > >> >e.g.https://groups.google.com/group/sci.electronics.design/msg/1257d5=0b73...> > >> --- > >> I missed those; thanks for the reality check. > > >Sure. =A0I know John--he's not the monster you think. =A0The FLIR stuff =in> >the SMD heatsink thread would be closely-guarded competitive info at > >other places, not cheerfully shared (with photos) on the web. > > Not really. What harm does it do me to share this information?That's your attitude, but not others'. The fact is it's a pretty cool trick that lets you make cutting-edge stuff better than the other guys. I just finished plowing through a load of references on SMD heatsinking that emphasized how important thermocouple placement was to making reliable measurements.> Restaurants publish their recipies and cookbooks. Doctors have seminars w=here> they teach one another their techniques. Unions have apprenticeship progr=ams. Service industries sell their services. Companies sell products, and not ideas. Some companies ' livelihoods are based on just a few ideas, techniques, or trade secrets. Like getting max thermal performance, maybe.> EEs are paranoid; most won't even show their products, much less discuss =the> innards.It's not always paranoia. When working for others I don't divulge their secrets, whatever they think those might be, however small they might seem to me. They're not mine to give. That's just good manners. -- Cheers, James Arthur
Reply by ●May 5, 20132013-05-05
On May 5, 3:01=A0pm, John Fields <jfie...@austininstruments.com> wrote:> On Sat, 4 May 2013 06:35:47 -0700 (PDT), dagmargoodb...@yahoo.com > wrote: > > > > > > > > > > >On May 3, 5:53=A0pm, John Fields <jfie...@austininstruments.com> wrote: > >> On Fri, 3 May 2013 07:30:44 -0700 (PDT), dagmargoodb...@yahoo.com > >> wrote: > > >> >On May 3, 6:14 am, John Fields <jfie...@austininstruments.com> wrote: > >> >> On Thu, 02 May 2013 17:54:47 -0700, John Larkin wrote: > > >> >> As for the caps themselves, it seems lemonade could be made from > >> >> lemons in that some use could be made of the parametric quality of =the> >> >> dielectric. For instance, that of a tuning element in an oscillator=.> > >> >> Or, perhaps, a voltage tunable filter? > > >> >> A modulator? > > >> >> An attenuator? > > >> >> But - in your quest for beauty and truth - I'm sure you've already > >> >> thought of those, at least, but remained silent for some good reaso=n> >> >> beyond the reach of the rest of us mere mortals. > > >> >No, actually, John suggested a parametric oscillator and several othe=r> >> >applications. > > >> >e.g.https://groups.google.com/group/sci.electronics.design/msg/1257d5=0b73...> > >> --- > >> I missed those; thanks for the reality check. > > >Sure. =A0I know John--he's not the monster you think. > > --- > Somehow, I think you give him less credit than he deserves. ;) > --- > > The FLIR stuff in the SMD heatsink thread would be closely-guarded > competitive info at other places, not cheerfully shared (with photos) > on the web. > > --- > Ah, yes... > > The munificent Larkin gives away what he doesn't care about and then > expects accolades and tears for his loss and his time on the cross. > > Methinks you've been hoodwinked.Oh that's just silly. I've known John for over thirty years. -- Cheers, James Arthur
