audio recording on IC -help wanted

On 10/17/2014 8:17 PM, mroberds@att.net wrote:
Followups set to sci.electronics.components .

In sci.electronics.components DaveC <invalid@invalid.net> wrote:
I have a 12V SPST cube relay in my junque box. The diagram molded into
the relay's housing includes a component connected in parallel with
the coil which looks suspiciously like a resistor. [...]

What is the purpose of this resistor?

It suppresses the inductive spike when the relay turns off. See page
3 of the Tyco application note
http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=Automotive_Relay_Applications&DocType=CS&DocLang=EN
or
http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=Automotive_Relay_Applications&DocType=CS&DocLang=EN
or even
http://is.gd/uGsYcA

I knew you could get automotive relays with nothing, a diode, or a
resistor across the coil, but I'd never heard before that any of these
shorten the life of the relay. I wonder what the mechanism is... does
it damage the coil winding insulation, or does it try to move the
armature a little, or what?

Matt Roberds
Click to expand...

diode can shorten life
http://web.archive.org/web/20110104003731/http://relays.tycoelectronics.com/appnotes/app_pdfs/13c3264.pdf

(sorry if this is a dupe)
 
On 10/17/2014 8:17 PM, mroberds@att.net wrote:
Followups set to sci.electronics.components .

In sci.electronics.components DaveC <invalid@invalid.net> wrote:
I have a 12V SPST cube relay in my junque box. The diagram molded into
the relay's housing includes a component connected in parallel with
the coil which looks suspiciously like a resistor. [...]

What is the purpose of this resistor?

It suppresses the inductive spike when the relay turns off. See page
3 of the Tyco application note
http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=Automotive_Relay_Applications&DocType=CS&DocLang=EN
or
http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=Automotive_Relay_Applications&DocType=CS&DocLang=EN
or even
http://is.gd/uGsYcA

I knew you could get automotive relays with nothing, a diode, or a
resistor across the coil, but I'd never heard before that any of these
shorten the life of the relay. I wonder what the mechanism is... does
it damage the coil winding insulation, or does it try to move the
armature a little, or what?
Click to expand...

Why might a diode shorten the life of a relay?
http://web.archive.org/web/20110104003731/http://relays.tycoelectronics.com/appnotes/app_pdfs/13c3264.pdf

(3rd attempt to post this)
 
bud-- <null@void.com> wrote:
On 10/17/2014 8:17 PM, mroberds@att.net wrote:

I knew you could get automotive relays with nothing, a diode, or a
resistor across the coil, but I'd never heard before that any of these
shorten the life of the relay.

Why can a diode across the coil shorten relay life?
http://web.archive.org/web/20110104003731/http://relays.tycoelectronics.com/appnotes/app_pdfs/13c3264.pdf
Click to expand...

Makes sense. I wasn't thinking about the contacts opening more slowly
and possibly arcing.

Matt Roberds
 
Once upon a time on usenet bud-- wrote:
On 10/17/2014 8:17 PM, mroberds@att.net wrote:
Followups set to sci.electronics.components .

In sci.electronics.components DaveC <invalid@invalid.net> wrote:
I have a 12V SPST cube relay in my junque box. The diagram molded
into the relay's housing includes a component connected in parallel
with the coil which looks suspiciously like a resistor. [...]

What is the purpose of this resistor?

It suppresses the inductive spike when the relay turns off. See page
3 of the Tyco application note
http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=Automotive_Relay_Applications&DocType=CS&DocLang=EN
or
http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=Automotive_Relay_Applications&DocType=CS&DocLang=EN
or even
http://is.gd/uGsYcA

I knew you could get automotive relays with nothing, a diode, or a
resistor across the coil, but I'd never heard before that any of
these shorten the life of the relay. I wonder what the mechanism
is... does it damage the coil winding insulation, or does it try to
move the armature a little, or what?


Why might a diode shorten the life of a relay?
http://web.archive.org/web/20110104003731/http://relays.tycoelectronics.com/appnotes/app_pdfs/13c3264.pdf

(3rd attempt to post this)
Click to expand...

Don't you mean 3rd attempt to get notification of posting?
--
Shaun.

"Humans will have advanced a long, long, way when religious belief has a
cozy little classification in the DSM."
David Melville (in r.a.s.f1)
 
On Saturday, August 2, 1997 at 10:00:00 AM UTC+3, John wrote:
I have a CTX 1565GM monitor that has a bad diode.
It appears to be a zener, located at ZD402 on the
monitor's main board.

The diode has the marking F15PH

I have been unable to cross-reference or even find
a listing for this part.

If you can help me, I would really appreciate it!

Thanks,

John Madderra

jmadderra@mindspring.com
Click to expand...

Hi i just found it :
http://www.alldatasheet.com/datasheet-pdf/pdf/62040/GE/BZX79-F15.html
 
On 2/10/2015 7:54 AM, vasilrvasilev88@gmail.com wrote:
On Saturday, August 2, 1997 at 10:00:00 AM UTC+3, John wrote:
I have a CTX 1565GM monitor that has a bad diode.
It appears to be a zener, located at ZD402 on the
monitor's main board.

The diode has the marking F15PH

I have been unable to cross-reference or even find
a listing for this part.

If you can help me, I would really appreciate it!

Thanks,

John Madderra

jmadderra@mindspring.com

Hi i just found it :
http://www.alldatasheet.com/datasheet-pdf/pdf/62040/GE/BZX79-F15.html
Click to expand...

Welcome aboard. You might want to check the dates of the posts you
reply too, though--that one's from 1997. (Google makes that somewhat
non-obvious, I understand.)

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

hobbs at electrooptical dot net
http://electrooptical.net
 
On Friday, January 4, 2002 at 5:18:02 PM UTC-6, dino wrote:
Hi guys, I'm trying to find a substitute for this diode : 1N34
I was unable to find it at digikey, jameco or radio shack

This is the data I found on it:

Name: 1N34
Type: signal
Material: germanium
PIV: 60 volts
Max current Forward(reverse) IO (ir) : 8.5 mA (15.0 uA)
Max drop Vf: 1.0 volts

I would appreciate help with finding a substitute. It's for NOPPP (no parts
pic programmer).

-dino
Click to expand...

the 1n914 i put in my mfj tuner seem to work well as a replacement for the 1n34 all the thing is doing is senceing the signal, I just use what ever I have.
 
On a sunny day (Tue, 17 Mar 2015 20:45:06 -0700) it happened Jeff Liebermann
<jeffl@cruzio.com> wrote in <51rhgahgk37k3galv54fb4avlotes6stf1@4ax.com>:

On Tue, 17 Mar 2015 21:05:08 -0500, Ramon F Herrera
ramon@conexus.net> wrote:

[Question for the gurus: Am I correct?, can the maximum settings, WAV
file capture *everything* in a cassette tape?]
Click to expand...

From a forensic POV I would only want the original tape.
The rest sounds like 100 % bull to me.

:)

You can do things with that tape, as Mr Liebermann pointed out earlier,
like looking for bias (changes) by for example playing at slower tape speed in some setup,
in a specialized setup.
All the media crap and CNN talk is complete nonsense.
They just need to fill air time, something incredibly easy if you assume some grey cells in the audience [1],
but rather difficult if you want to entertain apes [2].

[1] Open university.
[2] CNNs target audience.

Quote me.
 
On 04/08/2015 12:41 PM, Reinhard Zwirner wrote:
Attention: fup2!

Dear experts,

A "few" years ago Analog Devices launched SSM 2000 "Hush", a noise
reduction IC. Together with it they offered an evaluation board of
which I have schematic and circuit description but can't find
component placement plan and the board's layout which is difficult to
reverse engineer because the solder mask is black and absolutely opaque.

It would be great if somebody here could provide these searched for
documents.

TIA

Reinhard
Click to expand...

Why do you care?

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

hobbs at electrooptical dot net
http://electrooptical.net
 
Phil Hobbs schrieb:

[...]
> Why do you care?

I'm trying to de-noise old tape recordings of performances of an
amateur choir before burning them on CD. Of course I've tried that
with digital audio software but in my impression/experience there are
always audible artifacts after software de-noising, especially at low
audio levels.

So I'd like to try it the analog way. HUSH is said to work even with
Dolby compressed recordings. In the circuit description they show a
small additional circuit for optimizing level matching which has to
be integrated in the circuit of the eval board. For that purpose I'm
searching for layout and component placement plan.

Best regards

Reinhard
 
On 04/08/2015 01:39 PM, Reinhard Zwirner wrote:
Phil Hobbs schrieb:

[...]
Why do you care?

I'm trying to de-noise old tape recordings of performances of an
amateur choir before burning them on CD. Of course I've tried that
with digital audio software but in my impression/experience there are
always audible artifacts after software de-noising, especially at low
audio levels.

So I'd like to try it the analog way. HUSH is said to work even with
Dolby compressed recordings. In the circuit description they show a
small additional circuit for optimizing level matching which has to
be integrated in the circuit of the eval board. For that purpose I'm
searching for layout and component placement plan.

Best regards

Reinhard
Click to expand...

Ah, okay, understood. If you can scrounge up a NIR filter that passes,
say, wavelengths longer than 750 nm, and use an incandescent light
source and a camera, you might be able to see the traces through the
black mask, assuming that it's coloured by organic dye and not carbon black.

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

hobbs at electrooptical dot net
http://electrooptical.net
 
Update.

Am Montag, 11. Juni 2001 00:22:09 UTC+2 schrieb Colin Hartley:
I am insearch of a replacement Flyback Transformer for a Samsung TV model
CS-7277PF

The part number is FCZ-29A002

Can anyone help?

Thanks,
Colin
colin.hartley@verizon.net
Click to expand...
 
воскресенье, 6 декабря 1998 г., 10:00:00 UTC+2 пользователь John Saxton написал:
Anyone Know of source or equivalents for 2 audio power transistors;

SK C2577 170
SK A1102 170

I assume 170 as Jan 1970 manufacture, SK?

Do Inkel manufacture any longer. Any help with sourcing components,
equivalents, or Inkel cct diagrams etc much much appreciated.


Thank you



John Saxton
Click to expand...

Hello, you have found the possibility of replacing transistors ? Prompt what . Thank you
 
Hi

I suspect the parts are really 2SC2577 and 2SA1102 and made
in 1981 re date code of 170.

The SK prefix was used by second source suppliers, also used as
ie 3SK386 for MOSfet parts.

KW



On Sunday, 6 December 1998 00:00:00 UTC-8, John Saxton wrote:
Anyone Know of source or equivalents for 2 audio power transistors;

SK C2577 170
SK A1102 170

I assume 170 as Jan 1970 manufacture, SK?

Do Inkel manufacture any longer. Any help with sourcing components,
equivalents, or Inkel cct diagrams etc much much appreciated.


Thank you



John Saxton
Click to expand...
 
kilowatt wrote:
Hi

I suspect the parts are really 2SC2577 and 2SA1102 and made
in 1981 re date code of 170.

The SK prefix was used by second source suppliers, also used as
ie 3SK386 for MOSfet parts.
Click to expand...

The message you replied to was 16 years old.
 
On Tue, 21 Jul 2015, Michael A. Terrell wrote:

kilowatt wrote:

Hi

I suspect the parts are really 2SC2577 and 2SA1102 and made
in 1981 re date code of 170.

The SK prefix was used by second source suppliers, also used as
ie 3SK386 for MOSfet parts.

The message you replied to was 16 years old.
Click to expand...
Hate to justify thread necromancy that's mostly clewlessness but
there's this:
https://xkcd.com/979/

Ron
 
colonel_hack@yahoo.com wrote:
On Tue, 21 Jul 2015, Michael A. Terrell wrote:

The message you replied to was 16 years old.

Hate to justify thread necromancy that's mostly clewlessness but
there's this:
https://xkcd.com/979/
Click to expand...

Very true, though I often later discover the reason was that it was a
stupid question in the first place, for some reason that later becomes
obvious with a better understanding of the technical context.

In any case, a new topic is always better than posting to an old thread
on Usenet, as many newsservers won't still carry the original replies to
the old thread.

Not that most such Google groupies have a clue about that.

Anyway, thanks for the link. It lead me to this which I think is "print
out for the workshop wall" good:
http://xkcd.com/730/

--
__ __
#_ < |\| |< _#
 
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