Bill Sloman wrote:> On Jan 2, 5:49 pm, Joerg <inva...@invalid.invalid> wrote: >> BillSlomanwrote: >>> On Jan 2, 2:03 am, Joerg <inva...@invalid.invalid> wrote: >>>> BillSlomanwrote: >>>>> On Dec 31 2011, 7:05 pm, Jamie >>>>> <jamie_ka1lpa_not_valid_after_ka1l...@charter.net> wrote: >>>>>> Joerg wrote: >>>>>>> Oppie wrote: >>>>>>>> "Spehro Pefhany" <speffS...@interlogDOTyou.knowwhat> wrote in message >>>>>>>> news:g3vsf7pfm1v2cbp1cmmp2lnd2jp4qugn1c@4ax.com... >>>>>>>>> I figured that out while I was still in high school- that app notes >>>>>>>>> were generally not written by anyone resembling a practicing engineer. >>>>>>>>> Mostly by being bitten by their example circuits. >>>>>>>> With a few notable exceptions like Jim Williams. >>>>>>>> I really miss his crumby scope photos and clear writing style that not >>>>>>>> only sold parts but helped us to understand WHY things worked. There are >>>>>>>> many trade-offs in a design and understanding the basics puts a value on >>>>>>>> those choices. >>>>>>> Yep. A good engineer quickly learns to first look at the author's name. >>>>>>> If that is Jim Williams, Bob Pease, Robert Widlar, Dean Banerjee or one >>>>>>> of the other gurus I know it's good stuff. >>>>>> Oh boy, you know how to get brownie points. Was there something a >>>>>> mystery you've been working on lately? I am sure one of those guys will >>>>>> charm right in now :) >>>>> Jim Williams, Bob Pease and Robert Widlar are dead, Bob Widlar for >>>>> some years now. >>>>> Dan Banerjee still seems to be with us, but since he works for >>>>> National Semiconductor, Joerg probably doesn't authorise enough parts >>>>> per year to qualify for his interest. >>>> You and your premature conclusions :-) >>>> Dean actually answered one of the more unorthodox inquiries I had in >>>> person. National impressed the heck out of me when he did, that was good >>>> customer service. Bob Pease did, too, by the way. The only company that >>>> could rival that in my cases is Linear Technology, and back in the old >>>> days Analog Devices. >>>>> You seem to be even more out of touch with reality than Jim Thopmson, >>>>> who does still seem to know about electronics gurus, presumably >>>>> because he's yet to lose contact with the realities of electronics. >>>> So what kinds of products have you designed lately? Say, last year? >>> Have you been spending time with John Larkin? Whenever I correct one >>> of his nonsense off-topic posts, he tries to get back at me by asking >>> that question. >>> The answer is - as you well know - none. ... >> So how can you accuse people of being about to lose contact with >> electronics when yuo already have? Not that I find anything wrong with >> that, I might switch to brewing beer or whatever when I retire, but then >> I would not say such things here. In fact, I wouldn't even say them >> right now. >> >>> ... The Dutch electronics >>> industry is of the opinion that anybody over 55 ought to retire and >>> that anybody over 65 is retired, and I'm 69, so I'm retired, whether I >>> like it or not. I don't - as I mention here from time to time - but I >>> don't have the contacts or the attitude necessary to set up a >>> consulting business of my own, so I'm stuck with it. You've give me >>> good advice on the subject which I'd need a personality transplant to >>> be able to follow - I'm grateful for it, but it's not advice I'm >>> equipped to exploit. >> "Not equipped to exploit"? That is what I completely fail to understand. > > Personalities and talents differ from person to person. I'm not going > to go out and cold call. >Ok, allow me one more question then: Why does your public profile on LinkedIn end at 1969? If you are seriously interested in working I suggest to fill that out. It can result in them calling you instead of the other way around. Speaking from experience here :-)>>> I'm still fooling around with my variant on the Baxandall Class-D >>> oscillator, but have yet to get beyond LTspice into gEDA to create a >>> schematic of a circuit that I could build. I should probably talk to >>> my GP about anti-depressants, but can't be bothered ... >> Hint: LTSpice already makes a schematic that is good enough, so you can >> flick that switch on the Weller already :-) > > In reality, the LTSpice simulation runs terribly slowly if you include > the the comparator to drive the demodulator from the sine-wave output. > Bodging the model of the ADG1636 so that it's switch threshold is 0V > and hysterisis 10mV lets the simulation run much faster. > > There are a few other similar simplifications in the LTSpice circuit, > and it doesn't include any of the extra hardware that I'll want to > build in to be able to measure the - low - levels of the odd harmonics > in the output, like the bridged differentiator tunable notch filter to > get rid of the fundamental. >Hmm, but you wrote "have yet to get beyond LTspice into gEDA to create a schematic of a circuit that I could build". Most of the bench prototypes I build directly from the LTSpice schematic. I only enter stuff into the real CAD if it is about to become a product or an idea needs to be presented (LTSpice schematics are ugly). -- Regards, Joerg http://www.analogconsultants.com/
capacitive loading an opamp
Started by ●December 30, 2011
Reply by ●January 2, 20122012-01-02
Reply by ●January 2, 20122012-01-02
On Jan 2, 2:16=A0pm, John Devereux <j...@devereux.me.uk> wrote:> John Larkin <jjlar...@highNOTlandTHIStechnologyPART.com> writes: > > On Mon, 02 Jan 2012 12:23:18 +0000, John Devereux > > <j...@devereux.me.uk> wrote: > > [...] > > >>Yeah, I keep forgetting to ask mine about my memory problems... > > >>Seriously, I know depression is no joke. > > >>You don't at all need to make a PCB, just a soldering iron and a piece > >>of copper-clad FR4 is all I use for most circuits like that. Or even do > >>it Jim Williams / Jan style "air wiring". > > >><http://www.linear.com/images/general/AnalogCircuitDesignCover.jpg> > > > Do it like this: > > >http://johnlarkin.yolasite.com/resources/HV_proto.JPG > > I would if I hadn't broken all the bits of my dremel! :)Broken carbide drill bits are ideal, great for Dremelling out islands in FR-4. Once upon a time snapping a PCB bit was a waste, now it's a tool.> I have started using strips of fixed-pitch pads, they work quite > well. Pricy but one of them goes a long way. > > <http://uk.farnell.com/roth-elektronik/re1020/contact-strips-self-adhe...= > > > You cut a double-row to some length then it has a self-adhesive backing > so you can stick it down on FR4.Handy. -- Cheers, James Arthur
Reply by ●January 2, 20122012-01-02
On 1/2/2012 2:16 PM, John Devereux wrote:> John Larkin<jjlarkin@highNOTlandTHIStechnologyPART.com> writes: > >> On Mon, 02 Jan 2012 12:23:18 +0000, John Devereux >> <john@devereux.me.uk> wrote: >> > > [...] > >>> Yeah, I keep forgetting to ask mine about my memory problems... >>> >>> Seriously, I know depression is no joke. >>> >>> You don't at all need to make a PCB, just a soldering iron and a piece >>> of copper-clad FR4 is all I use for most circuits like that. Or even do >>> it Jim Williams / Jan style "air wiring". >>> >>> <http://www.linear.com/images/general/AnalogCircuitDesignCover.jpg> >> >> >> Do it like this: >> >> http://johnlarkin.yolasite.com/resources/HV_proto.JPG > > I would if I hadn't broken all the bits of my dremel! :) > > I have started using strips of fixed-pitch pads, they work quite > well. Pricy but one of them goes a long way. > > <http://uk.farnell.com/roth-elektronik/re1020/contact-strips-self-adhes-1-27mm/dp/1533014> > > You cut a double-row to some length then it has a self-adhesive backing > so you can stick it down on FR4. >Won Hung Lo has started making diamond-coated metal Dremel discs, a few bucks for 6 at Harbor Freight. They're a bit fatter than the sintered emery ones, but much tougher. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
Reply by ●January 2, 20122012-01-02
On Jan 2, 7:10=A0pm, Phil Hobbs <pcdhSpamMeSensel...@electrooptical.net> wrote:> On 1/2/2012 2:16 PM, John Devereux wrote: > > > > > John Larkin<jjlar...@highNOTlandTHIStechnologyPART.com> =A0writes: > > >> On Mon, 02 Jan 2012 12:23:18 +0000, John Devereux > >> <j...@devereux.me.uk> =A0wrote: > > > [...] > > >>> Yeah, I keep forgetting to ask mine about my memory problems... > > >>> Seriously, I know depression is no joke. > > >>> You don't at all need to make a PCB, just a soldering iron and a piec=e> >>> of copper-clad FR4 is all I use for most circuits like that. Or even =do> >>> it Jim Williams / Jan style "air wiring". > > >>> <http://www.linear.com/images/general/AnalogCircuitDesignCover.jpg> > > >> Do it like this: > > >>http://johnlarkin.yolasite.com/resources/HV_proto.JPG > > > I would if I hadn't broken all the bits of my dremel! :) > > > I have started using strips of fixed-pitch pads, they work quite > > well. Pricy but one of them goes a long way. > > > <http://uk.farnell.com/roth-elektronik/re1020/contact-strips-self-adhe.=..>> > > You cut a double-row to some length then it has a self-adhesive backing > > so you can stick it down on FR4. > > Won Hung Lo has started making diamond-coated metal Dremel discs, a few > bucks for 6 at Harbor Freight. =A0They're a bit fatter than the sintered > emery ones, but much tougher.Don't they foul pretty quickly? A snapped 20 mil (0.5mm) carbide drill bit is almost good enough for engraving with. Might even could do, if your Dremel's lighter than mine. -- Cheers, James Arthur
Reply by ●January 2, 20122012-01-02
On 1/2/2012 7:25 PM, dagmargoodboat@yahoo.com wrote:> On Jan 2, 7:10 pm, Phil Hobbs<pcdhSpamMeSensel...@electrooptical.net> > wrote: >> On 1/2/2012 2:16 PM, John Devereux wrote: >> >> >> >>> John Larkin<jjlar...@highNOTlandTHIStechnologyPART.com> writes: >> >>>> On Mon, 02 Jan 2012 12:23:18 +0000, John Devereux >>>> <j...@devereux.me.uk> wrote: >> >>> [...] >> >>>>> Yeah, I keep forgetting to ask mine about my memory problems... >> >>>>> Seriously, I know depression is no joke. >> >>>>> You don't at all need to make a PCB, just a soldering iron and a piece >>>>> of copper-clad FR4 is all I use for most circuits like that. Or even do >>>>> it Jim Williams / Jan style "air wiring". >> >>>>> <http://www.linear.com/images/general/AnalogCircuitDesignCover.jpg> >> >>>> Do it like this: >> >>>> http://johnlarkin.yolasite.com/resources/HV_proto.JPG >> >>> I would if I hadn't broken all the bits of my dremel! :) >> >>> I have started using strips of fixed-pitch pads, they work quite >>> well. Pricy but one of them goes a long way. >> >>> <http://uk.farnell.com/roth-elektronik/re1020/contact-strips-self-adhe...> >> >>> You cut a double-row to some length then it has a self-adhesive backing >>> so you can stick it down on FR4. >> >> Won Hung Lo has started making diamond-coated metal Dremel discs, a few >> bucks for 6 at Harbor Freight. They're a bit fatter than the sintered >> emery ones, but much tougher. > > Don't they foul pretty quickly? > > A snapped 20 mil (0.5mm) carbide drill bit is almost good enough for > engraving with. Might even could do, if your Dremel's lighter than > mine. > > -- > Cheers, > James ArthurThey work about the same as the emery ones, except that the emery ones break before you have to worry about cleaning them. An ultrasonicator would do a good job, but I generally just use a toothbrush. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
Reply by ●January 2, 20122012-01-02
On Jan 2, 10:11=A0pm, Joerg <inva...@invalid.invalid> wrote:> BillSlomanwrote: > > On Jan 2, 5:49 pm, Joerg <inva...@invalid.invalid> wrote: > >> BillSlomanwrote: > >>> On Jan 2, 2:03 am, Joerg <inva...@invalid.invalid> wrote: > >>>> BillSlomanwrote: > >>>>> On Dec 31 2011, 7:05 pm, Jamie > >>>>> <jamie_ka1lpa_not_valid_after_ka1l...@charter.net> wrote: > >>>>>> Joerg wrote: > >>>>>>> Oppie wrote: > >>>>>>>> "Spehro Pefhany" <speffS...@interlogDOTyou.knowwhat> wrote in me=ssage> >>>>>>>>news:g3vsf7pfm1v2cbp1cmmp2lnd2jp4qugn1c@4ax.com... > >>>>>>>>> I figured that out while I was still in high school- that app n=otes> >>>>>>>>> were generally not written by anyone resembling a practicing en=gineer.> >>>>>>>>> Mostly by being bitten by their example circuits. > >>>>>>>> With a few notable exceptions like Jim Williams. > >>>>>>>> I really miss his crumby scope photos and clear writing style th=at not> >>>>>>>> only sold parts but helped us to understand WHY things worked. T=here are> >>>>>>>> many trade-offs in a design and understanding the basics puts a =value on> >>>>>>>> those choices. > >>>>>>> Yep. A good engineer quickly learns to first look at the author's=name.> >>>>>>> If that is Jim Williams, Bob Pease, Robert Widlar, Dean Banerjee =or one> >>>>>>> of the other gurus I know it's good stuff. > >>>>>> =A0 Oh boy, you know how to get brownie points. Was there somethin=g a> >>>>>> mystery you've been working on lately? I am sure one of those guys=will> >>>>>> charm right in now :) > >>>>> Jim Williams, Bob Pease and Robert Widlar are dead, Bob Widlar for > >>>>> some years now. > >>>>> Dan Banerjee still seems to be with us, but since he works for > >>>>> National Semiconductor, Joerg probably doesn't authorise enough par=ts> >>>>> per year to qualify for his interest. > >>>> You and your premature conclusions :-) > >>>> Dean actually answered one of the more unorthodox inquiries I had in > >>>> person. National impressed the heck out of me when he did, that was =good> >>>> customer service. Bob Pease did, too, by the way. The only company t=hat> >>>> could rival that in my cases is Linear Technology, and back in the o=ld> >>>> days Analog Devices. > >>>>> You seem to be even more out of touch with reality than Jim Thopmso=n,> >>>>> who does still seem to know about electronics gurus, presumably > >>>>> because he's yet to lose contact with the realities of electronics. > >>>> So what kinds of products have you designed lately? Say, last year? > >>> Have you been spending time with John Larkin? Whenever I correct one > >>> of his nonsense off-topic posts, he tries to get back at me by asking > >>> that question. > >>> The answer is - as you well know - none. ... > >> So how can you accuse people of being about to lose contact with > >> electronics when yuo already have? Not that I find anything wrong with > >> that, I might switch to brewing beer or whatever when I retire, but th=en> >> I would not say such things here. In fact, I wouldn't even say them > >> right now. > > >>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ==A0 =A0 ... The Dutch electronics> >>> industry is of the opinion that anybody over 55 ought to retire and > >>> that anybody over 65 is retired, and I'm 69, so I'm retired, whether =I> >>> like it or not. I don't - as I mention here from time to time - but I > >>> don't have the contacts or the attitude necessary to set up a > >>> consulting business of my own, so I'm stuck with it. You've give me > >>> good advice on the subject which I'd need a personality transplant to > >>> be able to follow - I'm grateful for it, but it's not advice I'm > >>> equipped to exploit. > >> "Not equipped to exploit"? That is what I completely fail to understan=d.> > > Personalities and talents differ from person to person. I'm not going > > to go out and cold call. > > Ok, allow me one more question then: Why does your public profile on > LinkedIn end at 1969? > > If you are seriously interested in working I suggest to fill that out. > It can result in them calling you instead of the other way around. > Speaking from experience here :-)I'm on LinkedIn because several of the people I worked with at EMI in 1976-79 are on LinkedIn - they were an unusually good bunch, and I take care to keep in contact. I'm now also linked to a couple of members of my field hockey team, one of my nephews and his mother. I suppose I ought to take it seriously and fill in some more detail, but the last time I tried that they seemed to want money. I'll have another look ..> >>> I'm still fooling around with my variant on the Baxandall Class-D > >>> oscillator, but have yet to get beyond LTspice into gEDA to create a > >>> schematic of a circuit that I could build. I should probably talk to > >>> my GP about anti-depressants, but can't be bothered ... > >> Hint: LTSpice already makes a schematic that is good enough, so you ca=n> >> flick that switch on the Weller already :-) > > > In reality, the LTSpice simulation runs terribly slowly if you include > > the the comparator to drive the demodulator from the sine-wave output. > > Bodging the model of the ADG1636 so that it's switch threshold is 0V > > and hysterisis 10mV lets the simulation run much faster. > > > There are a few other similar simplifications in the LTSpice circuit, > > and it doesn't include any of the extra hardware that I'll want to > > build in to be able to measure the - low - levels of the odd harmonics > > in the output, like the bridged differentiator tunable notch filter to > > get rid of the fundamental. > > Hmm, but you wrote "have yet to get beyond LTspice into gEDA to create a > schematic of a circuit that I could build". Most of the bench prototypes > I build directly from the LTSpice schematic. I only enter stuff into the > real CAD if it is about to become a product or an idea needs to be > presented (LTSpice schematics are ugly).gEDA lets me extract detailed parts lists from the schematic, and other good things. IIRR Farnell has got a minimum order value, so it makes sense to buy all the parts in one hit. I know that if I'm careful about the documentation I can buy all the parts at once and not miss anything, and that's the way I like to work if I'm not under time pressure. I'm certainly not under pressure at the moment, though it might be good idea to invent some kind of dead-line ... -- Bill Sloman, Nijmegen
Reply by ●January 2, 20122012-01-02
On Jan 2, 6:52=A0pm, John Larkin <jjlar...@highNOTlandTHIStechnologyPART.com> wrote:> On Mon, 2 Jan 2012 02:41:52 -0800 (PST),BillSloman > > <bill.slo...@ieee.org> wrote: > >On Jan 2, 2:03 am, Joerg <inva...@invalid.invalid> wrote: > >> BillSlomanwrote: > >> > On Dec 31 2011, 7:05 pm, Jamie > >> > <jamie_ka1lpa_not_valid_after_ka1l...@charter.net> wrote: > >> >> Joerg wrote: > >> >>> Oppie wrote: > >> >>>> "Spehro Pefhany" <speffS...@interlogDOTyou.knowwhat> wrote in mes=sage> >> >>>>news:g3vsf7pfm1v2cbp1cmmp2lnd2jp4qugn1c@4ax.com... > >> >>>>> I figured that out while I was still in high school- that app no=tes> >> >>>>> were generally not written by anyone resembling a practicing eng=ineer.> >> >>>>> Mostly by being bitten by their example circuits. > >> >>>> With a few notable exceptions like Jim Williams. > >> >>>> I really miss his crumby scope photos and clear writing style tha=t not> >> >>>> only sold parts but helped us to understand WHY things worked. Th=ere are> >> >>>> many trade-offs in a design and understanding the basics puts a v=alue on> >> >>>> those choices. > >> >>> Yep. A good engineer quickly learns to first look at the author's =name.> >> >>> If that is Jim Williams, Bob Pease, Robert Widlar, Dean Banerjee o=r one> >> >>> of the other gurus I know it's good stuff. > >> >> Oh boy, you know how to get brownie points. Was there something a > >> >> mystery you've been working on lately? I am sure one of those guys =will> >> >> charm right in now :) > > >> > Jim Williams, Bob Pease and Robert Widlar are dead, Bob Widlar for > >> > some years now. > > >> > Dan Banerjee still seems to be with us, but since he works for > >> > National Semiconductor, Joerg probably doesn't authorise enough part=s> >> > per year to qualify for his interest. > > >> You and your premature conclusions :-) > > >> Dean actually answered one of the more unorthodox inquiries I had in > >> person. National impressed the heck out of me when he did, that was go=od> >> customer service. Bob Pease did, too, by the way. The only company tha=t> >> could rival that in my cases is Linear Technology, and back in the old > >> days Analog Devices. > > >> > You seem to be even more out of touch with reality than Jim Thopmson=,> >> > who does still seem to know about electronics gurus, presumably > >> > because he's yet to lose contact with the realities of electronics. > > >> So what kinds of products have you designed lately? Say, last year? > > >Have you been spending time with John Larkin? Whenever I correct one > >of his nonsense off-topic posts, he tries to get back at me by asking > >that question. > > >The answer is - as you well know - none. The Dutch electronics > >industry is of the opinion that anybody over 55 ought to retire and > >that anybody over 65 is retired, and I'm 69, so I'm retired, whether I > >like it or not. I don't - as I mention here from time to time - but I > >don't have the contacts or the attitude necessary to set up a > >consulting business of my own, so I'm stuck with it. You've give me > >good advice on the subject which I'd need a personality transplant to > >be able to follow - I'm grateful for it, but it's not advice I'm > >equipped to exploit. > > >I'm still fooling around with my variant on the Baxandall Class-D > >oscillator, but have yet to get beyond LTspice into gEDA to create a > >schematic of a circuit that I could build. I should probably talk to > >my GP about anti-depressants, but can't be bothered ... > > The big question in a life is: is your intellect in charge of the > direction of your life, or are you ruled by emotions?Everybody is ruled by their emotions, and nobody can think entirely straight. Read "Thinking, Fast and slow" by Daniel Kahneman, ISBN: 978-0-374-27563-1. It's brilliant, if rather worrying.> It's funny that you pretend to be oh-so-smart, but in fact your > intelligence is distorted, literally rendeded useless, by your > emotions.No more than anybody elses, and probably less than most. I've been aware of Daniel Kahneman's work for some years now, and keep an eye on the distortions in my thinking - this doesn't eliminate them, but makes me think twice before I make decisions. "Rendered useless" strikes me as a gross exaggeration> If you were smart, you'd do something about that.I do. Probably not as much as I might, but fighting with your sub- conscious has its costs, and it often makes sense to go with a sub- optimal decision that is easier to live with. -- Bill Sloman, Nijmegen
Reply by ●January 2, 20122012-01-02
On Mon, 2 Jan 2012 13:32:41 -0800 (PST), dagmargoodboat@yahoo.com wrote:>On Jan 2, 2:16�pm, John Devereux <j...@devereux.me.uk> wrote: >> John Larkin <jjlar...@highNOTlandTHIStechnologyPART.com> writes: >> > On Mon, 02 Jan 2012 12:23:18 +0000, John Devereux >> > <j...@devereux.me.uk> wrote: >> >> [...] >> >> >>Yeah, I keep forgetting to ask mine about my memory problems... >> >> >>Seriously, I know depression is no joke. >> >> >>You don't at all need to make a PCB, just a soldering iron and a piece >> >>of copper-clad FR4 is all I use for most circuits like that. Or even do >> >>it Jim Williams / Jan style "air wiring". >> >> >><http://www.linear.com/images/general/AnalogCircuitDesignCover.jpg> >> >> > Do it like this: >> >> >http://johnlarkin.yolasite.com/resources/HV_proto.JPG >> >> I would if I hadn't broken all the bits of my dremel! :) > >Broken carbide drill bits are ideal, great for Dremelling out islands >in FR-4. Once upon a time snapping a PCB bit was a waste, now it's a >tool. > > >> I have started using strips of fixed-pitch pads, they work quite >> well. Pricy but one of them goes a long way. >> >> <http://uk.farnell.com/roth-elektronik/re1020/contact-strips-self-adhe...> >> >> You cut a double-row to some length then it has a self-adhesive backing >> so you can stick it down on FR4. > >Handy.I have a Dremel tool that's a little toothed circular saw on the end of a shaft. It cuts nice slots in copper. I hold the Dremel down, horizontal and steady, and slide the board along under the cutter. I do wish I had a really good way to cut away copper, maybe the Dremel router rig. The Bellin adapters are great: http://www.beldynsys.com/ I stick them on copperclad with picture-mounting sticky foam stuff. John
Reply by ●January 2, 20122012-01-02
On Mon, 2 Jan 2012 18:06:22 -0800 (PST), Bill Sloman <bill.sloman@ieee.org> wrote:>On Jan 2, 6:52�pm, John Larkin ><jjlar...@highNOTlandTHIStechnologyPART.com> wrote: >> On Mon, 2 Jan 2012 02:41:52 -0800 (PST),BillSloman >> >> <bill.slo...@ieee.org> wrote: >> >On Jan 2, 2:03 am, Joerg <inva...@invalid.invalid> wrote: >> >> BillSlomanwrote: >> >> > On Dec 31 2011, 7:05 pm, Jamie >> >> > <jamie_ka1lpa_not_valid_after_ka1l...@charter.net> wrote: >> >> >> Joerg wrote: >> >> >>> Oppie wrote: >> >> >>>> "Spehro Pefhany" <speffS...@interlogDOTyou.knowwhat> wrote in message >> >> >>>>news:g3vsf7pfm1v2cbp1cmmp2lnd2jp4qugn1c@4ax.com... >> >> >>>>> I figured that out while I was still in high school- that app notes >> >> >>>>> were generally not written by anyone resembling a practicing engineer. >> >> >>>>> Mostly by being bitten by their example circuits. >> >> >>>> With a few notable exceptions like Jim Williams. >> >> >>>> I really miss his crumby scope photos and clear writing style that not >> >> >>>> only sold parts but helped us to understand WHY things worked. There are >> >> >>>> many trade-offs in a design and understanding the basics puts a value on >> >> >>>> those choices. >> >> >>> Yep. A good engineer quickly learns to first look at the author's name. >> >> >>> If that is Jim Williams, Bob Pease, Robert Widlar, Dean Banerjee or one >> >> >>> of the other gurus I know it's good stuff. >> >> >> Oh boy, you know how to get brownie points. Was there something a >> >> >> mystery you've been working on lately? I am sure one of those guys will >> >> >> charm right in now :) >> >> >> > Jim Williams, Bob Pease and Robert Widlar are dead, Bob Widlar for >> >> > some years now. >> >> >> > Dan Banerjee still seems to be with us, but since he works for >> >> > National Semiconductor, Joerg probably doesn't authorise enough parts >> >> > per year to qualify for his interest. >> >> >> You and your premature conclusions :-) >> >> >> Dean actually answered one of the more unorthodox inquiries I had in >> >> person. National impressed the heck out of me when he did, that was good >> >> customer service. Bob Pease did, too, by the way. The only company that >> >> could rival that in my cases is Linear Technology, and back in the old >> >> days Analog Devices. >> >> >> > You seem to be even more out of touch with reality than Jim Thopmson, >> >> > who does still seem to know about electronics gurus, presumably >> >> > because he's yet to lose contact with the realities of electronics. >> >> >> So what kinds of products have you designed lately? Say, last year? >> >> >Have you been spending time with John Larkin? Whenever I correct one >> >of his nonsense off-topic posts, he tries to get back at me by asking >> >that question. >> >> >The answer is - as you well know - none. The Dutch electronics >> >industry is of the opinion that anybody over 55 ought to retire and >> >that anybody over 65 is retired, and I'm 69, so I'm retired, whether I >> >like it or not. I don't - as I mention here from time to time - but I >> >don't have the contacts or the attitude necessary to set up a >> >consulting business of my own, so I'm stuck with it. You've give me >> >good advice on the subject which I'd need a personality transplant to >> >be able to follow - I'm grateful for it, but it's not advice I'm >> >equipped to exploit. >> >> >I'm still fooling around with my variant on the Baxandall Class-D >> >oscillator, but have yet to get beyond LTspice into gEDA to create a >> >schematic of a circuit that I could build. I should probably talk to >> >my GP about anti-depressants, but can't be bothered ... >> >> The big question in a life is: is your intellect in charge of the >> direction of your life, or are you ruled by emotions? > >Everybody is ruled by their emotions, and nobody can think entirely >straight. Read > >"Thinking, Fast and slow" by Daniel Kahneman, ISBN: 978-0-374-27563-1. >It's brilliant, if rather worrying. > >> It's funny that you pretend to be oh-so-smart, but in fact your >> intelligence is distorted, literally rendeded useless, by your >> emotions. > >No more than anybody elses, and probably less than most. I've been >aware of Daniel Kahneman's work for some years now, and keep an eye on >the distortions in my thinking - this doesn't eliminate them, but >makes me think twice before I make decisions. "Rendered useless" >strikes me as a gross exaggeration > >> If you were smart, you'd do something about that. > >I do. Probably not as much as I might, but fighting with your sub- >conscious has its costs, and it often makes sense to go with a sub- >optimal decision that is easier to live with.So, not so smart. John
Reply by ●January 3, 20122012-01-03
Bill Sloman <bill.sloman@ieee.org> writes:> On Jan 2, 1:23 pm, John Devereux <j...@devereux.me.uk> wrote: >> BillSloman<bill.slo...@ieee.org> writes:[...]>> >> > I'm still fooling around with my variant on the Baxandall Class-D >> > oscillator, but have yet to get beyond LTspice into gEDA to create a >> > schematic of a circuit that I could build. I should probably talk to >> > my GP about anti-depressants, but can't be bothered ... >> >> Yeah, I keep forgetting to ask mine about my memory problems... >> >> Seriously, I know depression is no joke. >> >> You don't at all need to make a PCB, just a soldering iron and a piece >> of copper-clad FR4 is all I use for most circuits like that. Or even do >> it Jim Williams / Jan style "air wiring". >> >> <http://www.linear.com/images/general/AnalogCircuitDesignCover.jpg> > > Been there, done that. You have to keep patching that kind of > prototype to keep it working, and I want to be able to post a copy of > the circuit to my friend in London who has some cute - if cheap - > spetral analysis hardware.Well the air wiring might be dodgy for that! But there is no reason why you could not prototype something based on sticking stuff down to copper-clad. That should easily survive being posted if well packed, and provided it is built with that goal in mind. Here is "one I made earlier": <http://ee.devereux.me.uk/IMG_1087.JPG> That was done without particular care but I am sure you could do better. -- John Devereux
