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---Jamie wrote:
Eeyore wrote:
John Fields wrote:
John Larkin wrote:
Does Eeyore ever post circuits?
---
I don't recall ever having seen one, and certainly nothing original.
Oh there's plenty original (and some interesting variants on established concepts like > using
pole-zero compensation in audio amps which is rare) but as ever it's the client's > copyright.
Any one have a violin to play, I've broke mine listening to Graham.
If Studiomaster hadn't shut down free public access to their schematics you could see loads of
them.
rid of some one."Michael A. Terrell" wrote:
Eeyore wrote:
John Larkin wrote:
Eeyore wrote:
John Larkin wrote:
Your favorite ancient complementary bipolar class AB stage seldom has
symmetric output current capability;
Really ?
Really.
Not to any extent worth worrrying over.
again, it doesn't matter if the load is driven properly.
And what is 'properly' ?
It gets the voltage waveform the designer intended that it get.
And you think that's about "if the load is driven properly" ? Don't leave
your day job would be my advice.
Why would he want to? He designs high power amplifiers for medical
equipment that you couldn't.
I wouldn't bet on that.
I've fixed 3 'runaways' including one in marine radar. I could tell you a story
or two about that. I turned a turkey into a significant commercial success.
There was a restructuring going on at the time. The Technical Director was being
promoted to Managing Director, his Technical Manager was becoming Technical
Director and quite a few of the R&D staff suggested I should apply for the open
Technical Manager post (staff of about 40).
I was VERY flattered.
Graham
Don't let that go to your head, over here, that's one method of getting
Yes, darling !Eeyore wrote:
John Fields wrote:
Eeyore wrote:
John Larkin wrote:
Does Eeyore ever post circuits?
Rarely since the copyright for most isn't mine.
---
I don't think anyone's asking you to infringe copyrights, what you
never seem to do is post simple schematics of your contemporaneous
designs which would provide solutions for querents here.
Except I wouldn't want to post non-proven designs. And discrete stuff
(one of my strong points) does tend to need proving.
---
So prove it.
If, in fact, discrete analog design is one of your strong points, you'd
know that if you're introducing some nuance into a previously proven
design and, therefore, don't know about the nitty-gritty of the combo
and/or you don't know how to simulate it properly, Then you need to
build a few a of them, test them over the expected changes in supply
voltage, ambient temperature, and load impedance, and report your
findings.
With the MD IMHO. He was almost crying to get me back today. He knows he's been fucked by the arseEeyore wrote:
John Fields wrote:
Eeyore wrote:
John Fields wrote:
John Larkin wrote:
Does Eeyore ever post circuits?
---
I don't recall ever having seen one, and certainly nothing original.
Oh there's plenty original (and some interesting variants on established concepts like
usingpole-zero compensation in audio amps which is rare) but as ever it's the client's
copyright.
---
Convenient, that...
There was a whole shedload of my circuits on the studiomaster site but some clot handed > them
overto a pay site.
I must mention that to the MD, was talking to him earlier.
---
The buck stops where?
GGF. The MD and I were discussing dismisalls today. Trouble is, I just took on another contract onEeyore wrote:
Jamie wrote:
Eeyore wrote:
John Fields wrote:
John Larkin wrote:
Does Eeyore ever post circuits?
---
I don't recall ever having seen one, and certainly nothing original.
Oh there's plenty original (and some interesting variants on established concepts like
using pole-zero compensation in audio amps which is rare) but as ever it's the client's
copyright.
Any one have a violin to play, I've broke mine listening to Graham.
If Studiomaster hadn't shut down free public access to their schematics you could see >loads of
them.
---
If frogs had wings...
http://www.dself.dsl.pipex.com/ampins/dipa/dipa.htmBuild yourself a complementary output stage. The you can change the
quiescent current from A though AB to B and finally C and HEAR the
difference. AND yes, it can be DC coupled.
It's also by FAR the 'best' configuration audio wise and as efficient as
it gets.
Graham
Ok so I can start from Fig 1A
I disagree with this. If one can obtain a decent BSim3 model of the lateralOn Sat, 18 Oct 2008 17:17:52 +0100, Eeyore
rabbitsfriendsandrelations@hotmail.com> wrote:
Then you
need to build a few a of them, test them over the expected changes in
supply voltage, ambient temperature, and load impedance, and report
your findings.
Why?On Sat, 18 Oct 2008 17:03:19 GMT, "Kevin Aylward"
kaExtractThis@kevinaylward.co.uk> wrote:
Eeyore wrote:
Take your fixed resistor load amp, put some capacitance across the
output and then put a pulse waveform in. Got it now.
Then do it with the fixed current sink and and the active load.
You will see some interesting things.
Yes, if you want performance, you really want a signal active source
and sink.
With a constant current sink, the other transistor has to drive that
one as well as the load. If it's active, then the other transistor,
has less work to
do, and all its current goes to its load. That's why I developed the
configuration I showed before ( the local output feedback loop one
http://www.kevinaylward.co.uk/ee/circuits/VeryLowDistortionAmp2.jpg).
Did you ever actually build it?
Suppose I work in class A with a current of 1A in the two outputBuild yourself a complementary output stage. The you can change the
quiescent current from A though AB to B and finally C and HEAR the
difference. AND yes, it can be DC coupled.
It's also by FAR the 'best' configuration audio wise and as efficient as
it gets.
Graham
Other question Graham ...
---John Fields wrote:
Eeyore wrote:
John Fields wrote:
Eeyore wrote:
John Larkin wrote:
Does Eeyore ever post circuits?
Rarely since the copyright for most isn't mine.
---
I don't think anyone's asking you to infringe copyrights, what you
never seem to do is post simple schematics of your contemporaneous
designs which would provide solutions for querents here.
Except I wouldn't want to post non-proven designs. And discrete stuff
(one of my strong points) does tend to need proving.
---
So prove it.
If, in fact, discrete analog design is one of your strong points, you'd
know that if you're introducing some nuance into a previously proven
design and, therefore, don't know about the nitty-gritty of the combo
and/or you don't know how to simulate it properly, Then you need to
build a few a of them, test them over the expected changes in supply
voltage, ambient temperature, and load impedance, and report your
findings.
Yes, darling !
Graham xxxxx
---John Fields wrote:
Eeyore wrote:
Jamie wrote:
Eeyore wrote:
John Fields wrote:
John Larkin wrote:
Does Eeyore ever post circuits?
---
I don't recall ever having seen one, and certainly nothing original.
Oh there's plenty original (and some interesting variants on established concepts like
using pole-zero compensation in audio amps which is rare) but as ever it's the client's
copyright.
Any one have a violin to play, I've broke mine listening to Graham.
If Studiomaster hadn't shut down free public access to their schematics you could see >loads of
them.
---
If frogs had wings...
GGF. The MD and I were discussing dismisalls today. Trouble is, I just took on another contract on
Monday. His timing is poor. Poor chap, he's always had the wool pulled over his eyes by idiots who
never deserved the positions they had.
John Fields wrote:
On Sat, 18 Oct 2008 17:17:52 +0100, Eeyore
rabbitsfriendsandrelations@hotmail.com> wrote:
Then you
need to build a few a of them, test them over the expected changes in
supply voltage, ambient temperature, and load impedance, and report
your findings.
I disagree with this. If one can obtain a decent BSim3 model of the lateral
fets, then an empirical test is pretty much irrelevant. The design of SOC
analogue ics, with 10'000s analogue devices, entirely in simulation, that
work, is routine. In fact, bench work is not even feasible. Indeed, using
worst case corner tools ( http://www.anasoft.co.uk/WCSETUP.GIF) and Monte
Carlo simulation allows one to far better ensure that products will work
reliably in production than a few bench tests, with nominal devices, can
possible hope to achieve.
John Fields wrote:
Eeyore wrote:
John Fields wrote:
Eeyore wrote:
John Fields wrote:
John Larkin wrote:
Does Eeyore ever post circuits?
---
I don't recall ever having seen one, and certainly nothing original.
Oh there's plenty original (and some interesting variants on established concepts like
usingpole-zero compensation in audio amps which is rare) but as ever it's the client's
copyright.
---
Convenient, that...
There was a whole shedload of my circuits on the studiomaster site but some clot handed > them
overto a pay site.
I must mention that to the MD, was talking to him earlier.
---
The buck stops where?
With the MD IMHO. He was almost crying to get me back today. He knows he's been fucked by the arse
lickers at last.
I'll make it a condition.
Graham
Lets see if I can find my hip boots.
Ok, I'll buy that. I didn't really notice the full "or you don't know how toOn Sun, 19 Oct 2008 09:25:17 GMT, "Kevin Aylward"
kaExtractThis@kevinaylward.co.uk> wrote:
John Fields wrote:
On Sat, 18 Oct 2008 17:17:52 +0100, Eeyore
rabbitsfriendsandrelations@hotmail.com> wrote:
Then you
need to build a few a of them, test them over the expected changes
in supply voltage, ambient temperature, and load impedance, and
report your findings.
I disagree with this. If one can obtain a decent BSim3 model of the
lateral fets, then an empirical test is pretty much irrelevant. The
design of SOC analogue ics, with 10'000s analogue devices, entirely
in simulation, that work, is routine. In fact, bench work is not
even feasible. Indeed, using worst case corner tools (
http://www.anasoft.co.uk/WCSETUP.GIF) and Monte Carlo simulation
allows one to far better ensure that products will work reliably in
production than a few bench tests, with nominal devices, can
possible hope to achieve.
---
I'd agree had you not snipped a little early. Here's the whole thing:
" If, in fact, discrete analog design is one of your strong points,
you'd know that if you're introducing some nuance into a previously
proven design and, therefore, don't know about the nitty-gritty of the
combo and/or you don't know how to simulate it properly, Then you need
to build a few a of them, test them over the expected changes in
supply voltage, ambient temperature, and load impedance, and report
your findings."
JF
John Larkin wrote:
On Sat, 18 Oct 2008 17:03:19 GMT, "Kevin Aylward"
kaExtractThis@kevinaylward.co.uk> wrote:
Eeyore wrote:
Take your fixed resistor load amp, put some capacitance across the
output and then put a pulse waveform in. Got it now.
Then do it with the fixed current sink and and the active load.
You will see some interesting things.
Yes, if you want performance, you really want a signal active source
and sink.
With a constant current sink, the other transistor has to drive that
one as well as the load. If it's active, then the other transistor,
has less work to
do, and all its current goes to its load. That's why I developed the
configuration I showed before ( the local output feedback loop one
http://www.kevinaylward.co.uk/ee/circuits/VeryLowDistortionAmp2.jpg).
Did you ever actually build it?
Why?
I mean, why should I build it? What possible purpose could that serve, thatOn Sun, 19 Oct 2008 09:49:04 GMT, "Kevin Aylward"
kaExtractThis@kevinaylward.co.uk> wrote:
John Larkin wrote:
On Sat, 18 Oct 2008 17:03:19 GMT, "Kevin Aylward"
kaExtractThis@kevinaylward.co.uk> wrote:
Eeyore wrote:
Take your fixed resistor load amp, put some capacitance across the
output and then put a pulse waveform in. Got it now.
Then do it with the fixed current sink and and the active load.
You will see some interesting things.
Yes, if you want performance, you really want a signal active
source and sink.
With a constant current sink, the other transistor has to drive
that one as well as the load. If it's active, then the other
transistor, has less work to
do, and all its current goes to its load. That's why I developed
the configuration I showed before ( the local output feedback loop
one
http://www.kevinaylward.co.uk/ee/circuits/VeryLowDistortionAmp2.jpg).
Did you ever actually build it?
Why?
I was wondering about all the ideal sources and zeners and fets and
stuff in the sim. And about your definition of "developed."
I'll take your answer for "no."
---I mean, why should I build it? What possible purpose could that serve, that
would not be known already?
John Larkin wrote:
On Sun, 19 Oct 2008 09:49:04 GMT, "Kevin Aylward"
kaExtractThis@kevinaylward.co.uk> wrote:
John Larkin wrote:
On Sat, 18 Oct 2008 17:03:19 GMT, "Kevin Aylward"
kaExtractThis@kevinaylward.co.uk> wrote:
Eeyore wrote:
Take your fixed resistor load amp, put some capacitance across the
output and then put a pulse waveform in. Got it now.
Then do it with the fixed current sink and and the active load.
You will see some interesting things.
Yes, if you want performance, you really want a signal active
source and sink.
With a constant current sink, the other transistor has to drive
that one as well as the load. If it's active, then the other
transistor, has less work to
do, and all its current goes to its load. That's why I developed
the configuration I showed before ( the local output feedback loop
one
http://www.kevinaylward.co.uk/ee/circuits/VeryLowDistortionAmp2.jpg).
Did you ever actually build it?
Why?
I was wondering about all the ideal sources and zeners and fets and
stuff in the sim. And about your definition of "developed."
I'll take your answer for "no."
I mean, why should I build it? What possible purpose could that serve, that
would not be known already?
Then the applecart wasn't designed right."Kevin Aylward" wrote:
I mean, why should I build it? What possible purpose could that serve, that
would not be known already?
---
Wiring has a nasty habit of upsetting perfectly loaded applecarts.
---John Fields wrote:
"Kevin Aylward" wrote:
I mean, why should I build it? What possible purpose could that serve, that
would not be known already?
---
Wiring has a nasty habit of upsetting perfectly loaded applecarts.
Then the applecart wasn't designed right.