capacitive loading an opamp

I wonder whether all his time is spent on researching his CV.

On Jan 2, 2:03=A0am, 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 messag=
e
> >>>>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 engine=
er.
> >>>>> 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 n=
ot
> >>>> 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 valu=
e on
> >>>> those choices.
> >>> Yep. A good engineer quickly learns to first look at the author's nam=
e.
> >>> If that is Jim Williams, Bob Pease, Robert Widlar, Dean Banerjee or o=
ne
> >>> of the other gurus I know it's good stuff.
> >> =A0 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 wil=
l
> >> 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 ...

--
Bill Sloman, Nijmegen

On Jan 2, 5:45=A0am, mrstar...@gmail.com wrote:
> I wonder whether all his time is spent on researching his CV.

That another thing I started but am not making any progress on. I've
got print-out of all my weekly reports - nominally directed to my
bosses but actually circulated to the whole project team - for the
three years of the electron beam tester project at Cambridge
Instruments (the one which featured Gigabit Logics GaAs logic clocked
at 800MHz for the coarse timing).

http://www.sciencedirect.com/science/article/pii/016793179090015L

I've scanned in - and edited - the first six months worth, but can't
be bothered getting on with getting through the rest.

--
Bill Sloman, Nijmegen

Bill Sloman <bill.sloman@ieee.org> writes:

> On Jan 2, 2:03&nbsp;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.
>> >> &nbsp; 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 ...

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>


-- 

John Devereux

Bill Sloman 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. ...


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.


> 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 :-)

-- 
Regards, Joerg

http://www.analogconsultants.com/

On Mon, 2 Jan 2012 02:41:52 -0800 (PST), Bill Sloman
<bill.sloman@ieee.org> wrote:

>On Jan 2, 2:03&#4294967295;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.
>> >> &#4294967295; 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?

It's funny that you pretend to be oh-so-smart, but in fact your
intelligence is distorted, literally rendeded useless, by your
emotions.

If you were smart, you'd do something about that.

John

On Jan 2, 1:23=A0pm, John Devereux <j...@devereux.me.uk> wrote:
> BillSloman<bill.slo...@ieee.org> writes:
> > On Jan 2, 2:03=A0am, 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.
> >> >> =A0 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 ...
>
> 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.

--
Bill Sloman, Nijmegen

On Mon, 02 Jan 2012 12:23:18 +0000, John Devereux
<john@devereux.me.uk> wrote:

>Bill Sloman <bill.sloman@ieee.org> writes:
>
>> On Jan 2, 2:03&#4294967295;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.
>>> >> &#4294967295; 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 ...
>
>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

John

On Jan 2, 5:49=A0pm, 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 mess=
age
> >>>>>>news:g3vsf7pfm1v2cbp1cmmp2lnd2jp4qugn1c@4ax.com...
> >>>>>>> I figured that out while I was still in high school- that app not=
es
> >>>>>>> were generally not written by anyone resembling a practicing engi=
neer.
> >>>>>>> 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. The=
re are
> >>>>>> many trade-offs in a design and understanding the basics puts a va=
lue on
> >>>>>> those choices.
> >>>>> Yep. A good engineer quickly learns to first look at the author's n=
ame.
> >>>>> 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 something =
a
> >>>> mystery you've been working on lately? I am sure one of those guys w=
ill
> >>>> 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 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. ...
>
> 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.
>
> > =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 understand.

Personalities and talents differ from person to person. I'm not going
to go out and cold call.

> > 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.

--
Bill Sloman, Nijmegen

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.

-- 

John Devereux