In article , Eeyore rabbitsfriendsandrel
scribeth thus


tony sayer wrote:

Eeyore scribeth thus
tony sayer wrote:
Eeyore scribeth thus
tony sayer wrote:
Eeyore scribeth thus

Did you check the spec of the LME49720 ?
http://www.national.com/pf/LM/LME49720.html

They had to devise a special method to measure the THD without the
noise
dominating.
They're not even that shockingly expensive.

Shockingly enough in small quantities;!...

From the likes of Farnell maybe £4 seems a lot but compare that to a $400
woodenvolume control knob !
http://uk.farnell.com/1367613/semico...rs-integrated-
circuits/product.us0?sku
=national-semiconductor-lme49720ma-nopb&_requestid=131459

That's only £2 per divine op-amp !

What were those $150 ones for then?..

Evaluation boards I think ?


Wonder what Doc Martin would have to say;?...

You lost me

Him of Neve descent, didn't you work together once?..

DOC ? Martin ? I knew a Martin forget his surname who was in R&D.

Not Martin (M.H) (Hartley) Jones PhD you mean ? He'd left by the time I
arrived.
I later did some work for him at Kelvin Hughes radar. Lovely chap. I still
talk to

him very occasionally. In fact I was just on the point of asking if he'd be
happy
to
be a reference on my CV !
http://www.ibd-uk.com/members/jones-martin.htm

Yes thats the one, my next door neighbour. I thought he'd be retiring by
now but he's as busy as ever...

I don't think he wants to stop. And your neighbour too ! What a small world it
is.


I'd expect he'd give U a reference..

I damn well hope so after I saved a project there ! Do you see him often ? Say
Graham
Stevenson sends his regards and let's see if it clicks.

Graham


M8!, he's out running around 5 am 'ish and off to work before I fall
downstairs and amble out to my office;!..

And gawd knows when he comes home either!, but if I do I will..
--
Tony Sayer

In article , Marky P
scribeth thus
On Wed, 15 Oct 2008 20:58:29 +0100, tony sayer
wrote:

In article , Eeyore rabbitsfriendsandrel
scribeth thus


tony sayer wrote:

Eeyore scribeth thus
Robert Orban wrote:
says...

Seems to be tricky to find anything actually.

This mic has a max input SPL of 134dB which receives the comment "Hi-SPL
handling is perfect for suspension over choirs and orchestras"

http://www.dv247.com/invt/11582/

Try this:

Dynamic-Range Requirement for Subjectively Noise-Free Reproduction of
Music
JAES Volume 30 Issue 7/8 pp. 504-511; August 1982

A dynamic range of up to 118 dB is determined necessary for subjectively
noise-free reproeuction of music in an audio recorder with a white-noise
floor. Maximum peak sound-pressure levels in music are compared to the
minimum
discernible level of white noise in a quiet listening situation.
Microphone
noise limitations, monitoring loudspeaker capabilities, and performance
environment noise levels are also considered.

Author: Fielder, Louis D.
Affiliation: Ampex Corporation, Redwood City, CA

Well, I never imagined I'd have Bob Orban backing me up on a technical
issue
!

Thanks Bob !

Graham

Him being the one who will be criticised on other groups for making DAB
and FM ever more distorted;!...
--
Tony Sayer

You can't win 'em all !

No but theres a local station round these parts where the engineer does
give a monkeys but the programme controller only knows LOUD LOUD and
LOUDER!!! cos the bloke at the other station down the road is the same;;

All thinking LOUD is better..

The local community station ****es over all of them for absolute sound
quality)..

Graham


What station's that then?


http://www.209radio.co.uk

Soon to have a new upgraded mixed polarisation aerial system to improve
coverage..

Pix on mb21 as soon as its done, with the newly refurbished one at Ely
Cathedral..

Marky P.

--
Tony Sayer

Bancom Communications U.K. Tel+44 1223 566577 Fax+44 1223 566588

4 Wingate close, Cambridge, England, CB2 9HW E-Mail

In article , Eeyore rabbitsfriendsandrel
scribeth thus


tony sayer wrote:

Eeyore scribeth thus

Thanks Bob !

Graham

Him being the one who will be criticised on other groups for making DAB
and FM ever more distorted;!...
--
Tony Sayer

You can't win 'em all !

No but theres a local station round these parts where the engineer does
give a monkeys but the programme controller only knows LOUD LOUD and
LOUDER!!! cos the bloke at the other station down the road is the same;;

All thinking LOUD is better..

The local community station ****es over all of them for absolute sound
quality)..

What's a community station ? :-(

For me, radio is all but finished. Apart from Radio 4 of course. It's the same
pap
from every broadcaster. I can even recall several times changing channel and
finding
the very same track being played on the new one. Grrrrrrrr.

Its a version of small scale local radio with very public access to
offer more locally focused programming.

Some downright weird .. some wonderful

Sunday's are excellent and "evening under lamplight" is as good as
anything the BBC could produce..


But NO centralised playlists and no talking down to the listener like
BBC local radio. Almost entirely staffed by volunteers..

http://www.209radio.co.uk/schedule/




Graham


--
Tony Sayer

On Wed, 15 Oct 2008 23:11:16 +0100, Eeyore
wrote:



Marky P wrote:

Eeyore wrote:
Arny Krueger wrote:
"tony sayer" wrote

I Wonder how may pro recording bits of gear are around
with 5532's..

Tons and tons.

But 5532s used right are really very good pieces, even by modern standards.
And for the price...!

And to think they were around in the 1970s too ! And Philips / Signetics
initially only thought they were going to sell it into the telecoms market
because of the 600 ohm drive !

Philips = NE5532
Signetics ( Philips N.A.) = SE5532 btw.


The scarier part is how may pro recording bits of gear are around with
TL074s, or even NJM4558s in the signal path.

TL07Xs are still ok for some stuff, especially because of the jfet front end
but 4558s ? YUCK !

Graham

Well, since we're on the subject of IC's, I've dug out my little
drawer of IC's left over from my 80's electronics days :-)
Can't remember if any of these are op amps, but here are the numbers:
LM382N
LM380N

Maybe a crappy low power audio amp.

LM3482A

No idea about the above.


LM741 (pretty sure this is an op amp)

Pretty lousy one too by today's standards.


M5K4164ANP (ain't a bloody clue what this is)

Sounds like a Mostek part number. Does it have lots of legs ?

Yep. 16.


TIP31A

TO-220 medium power transistor. Forget which polarity.


ZTX300 (a little 3 pin thing)

Ferranti (now Zetex) small signal npn ? transistor. Their version (E-line) of
TO-92.


ZN414 (this is an FM radio on a 3 pin chip)

For a TRF design.


MJE2955

PNP complement of the 2N3055. TO-3 115W 60V device.


NE555P (loads of these buggers, I know they are timers).

They are. Single timers.

Graham

Thanks for that! Now I've gotta decide whether to bin 'em or keep 'em
for nostalga's sake :-)


Marky P.

On Wed, 15 Oct 2008 23:04:45 +0100, Eeyore
wrote:



tony sayer wrote:

Eeyore scribeth thus

Thanks Bob !

Graham

Him being the one who will be criticised on other groups for making DAB
and FM ever more distorted;!...
--
Tony Sayer

You can't win 'em all !

No but theres a local station round these parts where the engineer does
give a monkeys but the programme controller only knows LOUD LOUD and
LOUDER!!! cos the bloke at the other station down the road is the same;;

All thinking LOUD is better..

The local community station ****es over all of them for absolute sound
quality)..

What's a community station ? :-(

For me, radio is all but finished. Apart from Radio 4 of course. It's the same pap
from every broadcaster. I can even recall several times changing channel and finding
the very same track being played on the new one. Grrrrrrrr.

Graham

People used to slag off ILR radio in the past, but it's much worse now
than it's ever been! Haven't listened in a long time (only for
evaluation purposes).


Marky P.

On Thu, 16 Oct 2008 08:55:57 +0100, tony sayer
wrote:

In article , Marky P
scribeth thus
On Wed, 15 Oct 2008 20:58:29 +0100, tony sayer
wrote:

In article , Eeyore rabbitsfriendsandrel
scribeth thus


tony sayer wrote:

Eeyore scribeth thus
Robert Orban wrote:
says...

Seems to be tricky to find anything actually.

This mic has a max input SPL of 134dB which receives the comment "Hi-SPL
handling is perfect for suspension over choirs and orchestras"

http://www.dv247.com/invt/11582/

Try this:

Dynamic-Range Requirement for Subjectively Noise-Free Reproduction of
Music
JAES Volume 30 Issue 7/8 pp. 504-511; August 1982

A dynamic range of up to 118 dB is determined necessary for subjectively
noise-free reproeuction of music in an audio recorder with a white-noise
floor. Maximum peak sound-pressure levels in music are compared to the
minimum
discernible level of white noise in a quiet listening situation.
Microphone
noise limitations, monitoring loudspeaker capabilities, and performance
environment noise levels are also considered.

Author: Fielder, Louis D.
Affiliation: Ampex Corporation, Redwood City, CA

Well, I never imagined I'd have Bob Orban backing me up on a technical
issue
!

Thanks Bob !

Graham

Him being the one who will be criticised on other groups for making DAB
and FM ever more distorted;!...
--
Tony Sayer

You can't win 'em all !

No but theres a local station round these parts where the engineer does
give a monkeys but the programme controller only knows LOUD LOUD and
LOUDER!!! cos the bloke at the other station down the road is the same;;

All thinking LOUD is better..

The local community station ****es over all of them for absolute sound
quality)..

Graham


What station's that then?


http://www.209radio.co.uk

Soon to have a new upgraded mixed polarisation aerial system to improve
coverage..

Pix on mb21 as soon as its done, with the newly refurbished one at Ely
Cathedral..

Marky P.

Oh, of course. Should've known ;-)


Marky P.

Marky P wrote:

Eeyore wrote:
Marky P wrote:


M5K4164ANP (ain't a bloody clue what this is)

Sounds like a Mostek part number. Does it have lots of legs ?

Yep. 16.

Ah ! 4164. That's ancient DRAM 64k x 1 IIRC.

Graham

Marky P wrote:

Eeyore wrote:
Marky P wrote:

ZN414 (this is an FM radio on a 3 pin chip)

For a TRF design.

IIRC I recall someone once asking for one of those sci.electronics.components.

You could offer them on there rather than junk them.

Graham

Marky P wrote:

Eeyore wrote:
tony sayer wrote:
Eeyore scribeth thus

Thanks Bob !

Graham

Him being the one who will be criticised on other groups for making DAB
and FM ever more distorted;!...
--
Tony Sayer

You can't win 'em all !

No but theres a local station round these parts where the engineer does
give a monkeys but the programme controller only knows LOUD LOUD and
LOUDER!!! cos the bloke at the other station down the road is the same;;

All thinking LOUD is better..

The local community station ****es over all of them for absolute sound
quality)..

What's a community station ? :-(

For me, radio is all but finished. Apart from Radio 4 of course. It's the same pap
from every broadcaster. I can even recall several times changing channel and finding
the very same track being played on the new one. Grrrrrrrr.

People used to slag off ILR radio in the past, but it's much worse now
than it's ever been! Haven't listened in a long time (only for
evaluation purposes).

BBC local radio is better ( three counties here ) but it's still sonic wallpaper. And the
number of people who ring in about their cat / dog / hamster etc. Drives you up the wall.



Graham

On Thu, 16 Oct 2008 14:02:20 +0100, Eeyore
wrote:



Marky P wrote:

Eeyore wrote:
tony sayer wrote:
Eeyore scribeth thus

Thanks Bob !

Graham

Him being the one who will be criticised on other groups for making DAB
and FM ever more distorted;!...
--
Tony Sayer

You can't win 'em all !

No but theres a local station round these parts where the engineer does
give a monkeys but the programme controller only knows LOUD LOUD and
LOUDER!!! cos the bloke at the other station down the road is the same;;

All thinking LOUD is better..

The local community station ****es over all of them for absolute sound
quality)..

What's a community station ? :-(

For me, radio is all but finished. Apart from Radio 4 of course. It's the same pap
from every broadcaster. I can even recall several times changing channel and finding
the very same track being played on the new one. Grrrrrrrr.

People used to slag off ILR radio in the past, but it's much worse now
than it's ever been! Haven't listened in a long time (only for
evaluation purposes).

BBC local radio is better ( three counties here ) but it's still sonic wallpaper. And the
number of people who ring in about their cat / dog / hamster etc. Drives you up the wall.



Graham

Three Counties here too (near St. Neots). Actually, I think BBC local
radio has generally improved over the years. I prefer talk radio to
music radio generally.

Marky P.