audio recording on IC -help wanted

[Chris Mares]

Hi everyone, I am looking for an updated replacement transistor for a
Bendix PS-19.
Does anyone have a way to cross it to a currently available transistor?
Thanks. Chris

 

[Peter A Forbes]

On Fri, 08 Jun 2007 08:40:35 GMT, "Roger Hamlett"
<rogerspamignored@ttelmah.demon.co.uk> wrote:

Hi,
I have an application, where I need to sense AC current imbalance between
two lines. Perfect application for a CBCT. The wires themselves carry a
reasonably high voltage (at moments, in excess of 3KV), so my 'prototype',
has a Teflon block going through the transformer, with the two wires
positioned in this (giving both good position stability, and insulation).
Now, my problem is the size of the CBCT. There are readily available
toroids, with hole sizes from perhaps 35mm and up. However I have a height
limit over the board, which is making this unuseable. What I'd like to
find, is something like a rectangular CBCT, with a central hole perhaps
25mm wide, and a relatively low total height (not exceeding 50mm to the
top of the winding), that is available 'off the shelf' (the run size is
small, so doesn't warrant a custom transformer). Perhaps 500:1 ratio
(though the circuit can be adjusted to handle a wide tolerance here), and
peak current rating doesn't need to exceed 1A.
I am in the UK, so a UK source would be preferred.
Searches of the normal component manufacturers find lots of larger
toroids, and a few rectangular designs, and a general Google search, gives
lots of companies able to make custom units, but nothing visible 'off the
shelf'.
So, has anyone any pointers to a supplier stocking items like this?.

Many thanks in advance.

Roger:

Does your 'CBCT' relate to a standard Current Transformer?

We have got some small CT's at work, I am working at home on a PCB today but can
pop round lunchtime and see what size and spec they are.

Peter
--
Peter & Rita Forbes
Email: diesel@easynet.co.uk
Web: http://www.oldengine.org/members/diesel

 

[Michael A. Terrell]

Hello folks,

I am getting cheap these days, I am trying to cut corner by tripling the
capacitance in the capacitor, is this possible? I have heard that it's
possible. Some people have done it successfully. I am just wondering if
any of you smart dumbass can help.

Any way, I would appreciate your help.



--
Service to my evil master? Been there, Done that, and I've got my DD666 to
prove it.
Member of DAV #666.

Michael A. Terrell
Central Florida

 

[Hal Murray]

why would all manufacturers of 80-conductor ATAPI cables stock and use
connectors in three different colours when doing so it only costing
them money? (over using the same colour in each place)

If the volumes are high enough, the extra cost won't be much.

It probably pays for itself by allowing easy visual inspection
and/or simplifying the text in the installation description.

--
These are my opinions, not necessarily my employer's. I hate spam.

 

[Dave Platt]

In article <LAWYj.58$mz3.55@fe101.usenetserver.com>,
Gary L. Woodruff <woodruffrepair@frontiernet.net> wrote:

Dave, Thanks for the help. I will try the mj11032g for the higher
current. When I look at the data sheet I do see a diode E to C in the
schem. I have limited experience replacing with something that is not an
exact equiv. I assume a Schottky diode, but what rating, etc? Any
knowledge you could impart would be greatly appreciated.

You need a diode/rectifier which will stand off the maximum battery
voltage (with safety margin), and which can handle current peaks of up
to the maximum amount of current drawn by the motor (with the worst
case probably being when the motor is just starting up or is stalled).
The *average* current which the diode will have to handle, will be
much lower, since it will conduct only during the moment when the
transistor switches off and the diode provides a current-flow path for
the energy stored in the motor inductance.

I'd consider something like an IR HexFred diode - maybe the
Digikey-part-number HFA30TA60CPBF or similar - it'll handle 30 amperes
average and is in an easy-to-mount TO-220AB package.

You might be able to get away with an ordinary power rectifier such as
a Crydom CRNA25-400 (25 amps, 400 volts), but since these are going to
switch on and off more slowly than a HexFred or Schottky you'd
probably see higher peak reverse voltages across the transistor.

--
Dave Platt <dplatt@radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

 

[Gary L. Woodruff]

legg wrote:

On Wed, 21 May 2008 13:27:46 -0400, "Gary L. Woodruff"
woodruffrepair@frontiernet.net> wrote:

legg wrote:
On Tue, 20 May 2008 10:40:22 -0400, "Gary L. Woodruff"
woodruffrepair@frontiernet.net> wrote:

howdy all,

I am trying to replace a transistor 2SD829. Here is a link to a data
sheet. http://www.datasheets.org.uk/pdf/3937549.pdf

I need the replacements asap so common replacement would be great.

any help would be greatly appreciated.

You could probably retrofit a TO218 or TO247 body size into place.

http://www.nteinc.com/specs/200to299/pdf/nte256.pdf

Pinout is the same - youd have to come up with a pressure bar and
longer mounting screws.

RL
Howdy, thanks for the reply. I believe this looks like the most direct
replacement for the 2SD829. Correct me if i am wrong but it does not
need any other modifications except to mount and dissipate heat?


Taking a look at my own usual supplier, the closest thing
electrically, and in stock from Digikey, is the MJH11017.


http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=MJH11022GOS-ND

http://www.onsemi.com/pub_link/Collateral/MJH11017-D.PDF

RL
I missed the missing diode in the nte256! I have received a few

recommendations and am starting to become confused. If I use the
MJH11017 will I need to add an additional diode to the circuit? If I do,
could someone detail where in the circuit I would add it?

Thanks, Gary

 

[Archimedes' Lever]

On Tue, 27 Jan 2009 11:55:38 -0800 (PST), bud-- <budnews@isp.com> wrote:

And although you never make mistakes,

I made on, thinking that you have half a brain.

mere humans do.

How would you know, since you do not qualify?

Cat rated
meters are protected in the case a mere human tries to meter on the
wrong range.

Modern meters auto-range, you retarded, Chinese cheap shit fuckhead.

 

[Michael A. Terrell]

Radiosrfun wrote:

"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
news:46A37739.92938C1F@earthlink.net...
test equipment buyer wrote:


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

Eh, Mike - I see you sort of repeated this 3 times, and this wasn't the
first one I seen that happen to. Are you doing it on purpose OR is it
automatically doing it for some reason? Just curious!

I replied to three of his posts.

As for "his" posts - I blocked him a while ago. But to answer his needs -
there is a company - "Tucker Electronics" who handles lots of that sort of
equipment. They're not what "I" consider to be "cheap" in price - but they
"claim" the equipment <in most cases> is gone over and calibrated. So -
maybe between there - and E-bay - he can find what he needs - OR do a google
search for those types of equipment, instead of spamming the group(s).

He wants to screw people of of equipment a low prices to make a
profit. Its the same moron who is trying to sell the same crap. He has
sent me emails to tell me he won't stop, so all we have to do is wait
till the company's reputation is so bad that no one will pay their
prices.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

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[Yianni]

You don't need pressure ratings. Because you should enclose the circuit in
an airtight box, shouldn't you? Otherwise moisture would be the problem. If
you enclose the circuit in a box (or even inside glue or something similar),
the box should stand the pressure, not the circuit. In case of glue, there
would be a very little increase in pressure, inside a box much less increase
in pressure.
Just an example. You don't care for the pressure to circuits inside a
submarine, you care for the pressure forces the submarine itself.


--
Yianni
9jir_2006@yahoo.gr
(Remove the number nine from my email address to send me email)


"Michael" <mQiQcQhQaQeQlQ@QmQhQiQmQsQ.QcQoQ.QuQkQ> wrote in message
news:yR5vi.68437$%v3.1194@fe3.news.blueyonder.co.uk...

Hi,

Does anyone here know if components have to meet a certain test
requirements when it comes to being installing in above-atmospheric
pressure environments?

I'm wondering on an underwater project and would like to use pressure
compensation but not sure how high I can go....

I imagine it varies from component to component but I've yet to come
across a spec on any datasheets.

Cheers,

Michael

 

[legg]

On Thu, 22 May 2008 11:00:16 -0400, "Gary L. Woodruff"
<woodruffrepair@frontiernet.net> wrote:

legg wrote:

Taking a look at my own usual supplier, the closest thing
electrically, and in stock from Digikey, is the MJH11017.


http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=MJH11022GOS-ND

http://www.onsemi.com/pub_link/Collateral/MJH11017-D.PDF

RL
I missed the missing diode in the nte256! I have received a few
recommendations and am starting to become confused. If I use the
MJH11017 will I need to add an additional diode to the circuit? If I do,
could someone detail where in the circuit I would add it?

The MJH11017-d is an electrical equivalent. No extra parts needed.

RL

 

[Gaetan Mailloux]

Hello


Anybody have those cds photoresistors; NSL-7540 and NSL7550 ?


Thank

Gaetan

 

[GoldIntermetallicEmbrittl]

On Tue, 16 Sep 2008 02:49:00 +0100, Peto <peto@invalid.com> wrote:

On Tue 16 Sep08 01:08, GoldIntermetallicEmbrittlement
GoldIntermetallicEmbrittlement@youdontknowjack.org> wrote in
news:b2ttc4ph6l9acth9m4de75i9lskcts0bgo@4ax.com>:

On Mon, 15 Sep 2008 17:30:23 -0400, "Tim Perry"
timperry@nospammeadelphia.net> wrote:

Grease is not commonly used on F connector threads. Some weather
tight models exude a sealer when crimped... but not on the
threads.


Not true. There are several cities where the cable contractors
followed the CORRECT methodology of SEALING their fittings
with an anti-oxidant/moisture barrier.

This has NOTHING to do with U/G coax cabling, which has a
liquid sealant layer between the sheath (jacket) and the
first braid or foil layer.

That's the threads, AND the "stinger". From a man hour POV, it
is easier to simply plop a wad of it in the fitting, then the
center conductor as well as the threads get the application.
The media does not damage the connector or ANY fitting it gets
mated with.

Cable companies are SUPPOSED to cut back their fittings every
ten years and place a new, properly treated fitting. THAT is
what the original plan called for, and is also what SHOULD BE
practiced.
A ten year old uncoated fitting will have far more losses (can
have) than one which has had anti-oxidant treatment after a ten
year span.

So, in a PROPERLY implemented cable system, treatment IS the
common practice and teaching.

Where did I learn this? Cincinnati's Time Warner (formerly
CUBE) cable system. Way back in the early 80's. That was a
DUAL system, so every run was twice the number of fittings.
Every hard line run was twice the number. Dual taps at every
node. All sealed from moisture.


Hi, I am the OP. I can see that the threads of the plug and socket
would grip one another and probably make good electrical contact.

However, I can't see the wire centre connector necessarily making
electrical contact through that grease.

The "grease" should NOT be your choice of simple petroleum jelly. It is
a specific medium. It does not inhibit OR push back against anything, so
it would not keep the wiper from gliding into the proper, connected
position... ever.

Does the centre conductor actually have to make electrical contact or
is 240 MHz RF able to propagate properly across the plug/socket join
even if the centre conductor is not electricially continuous?

With the proper medium it will not ever be kept from making said
contact. It does not have the same consistency or viscosity as PJ does.

 

[William Miller]

WANTED: used/defective Sharp microwave control panels (R15## & R140#
models preferred)

While I will consider MOST ANY Sharp model, I am most interested in
these part & model numbers:

- CPWBFB069MRU0 models R1405 & R1406

- CPWBFB075MRU0 models R1500 R1501 R1502 R1502LK R1505 R1505F R1505LK
R1506

- CPWBFB076MRU0 (was CPWBFB064MRU0) models Sharp R1510F R1511 R1511F
R1512 R1512F R1514 R1514F R1514H R1520 R1520LK R1520LQ R1520LW

Prefer entire control panel assembly with control panel frame, keypad
and control unit (circuit board) but will consider just the control
unit (circuit board with display).

Used and even non-working is FINE, but PLEASE let me know if (and how)
if it is physically broken or damaged.

Thanks,

William E. Miller
prototech@usa.net

 

[Eeyore]

John Fields wrote:

Eeyore wrote:
John Fields wrote:

Pay no attention to the Donkey troll.

One of his favorite tricks is to try to derail a discussion by
focusing on irrelevant minutiae

Pieter is the one discussing irrelevancies such as the non-existent RC oscillator
in a standard 8051.

---
On the contrary, he made it very clear that he knew there's no
internal RC oscillator in an 8051:

Which is therefore utterly irrlevant to the OP's post and is merely idiotic
obfuscation.

Graham

 

[Phil Allison]

Archimedes'= CRIMINAL PSYCHOPATH "


** Report this FUCKING SCUMBAG to his ISP

NOW !!!!!!!!!!!!!!!!

Get the VILE PIG OFF usenet for ever.

The gutless POS anonymous ASSHOLE has a long CRIMINAL history.


Do NOT TOLERATE VILE SCUM like this puke

fucking up YOUR news group !!!!






...... Phil

 

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[Keith M]

I'm searching for a source of a DRAM memory IC that would have the
following specs:

20-pin DIP memory chips

(16) 1meg x 4-bit dips make up a bank of 8mb.
Should be 60-ns
Fast Page Mode
non-parity

An example would be Toshiba TC514400AP-60.

Other manufacturers might use the following base part numbers:

Fujitsu MB : 814400
Goldstar GM : 71C4400
Hitachi HM : 514400
Hyundai HY : 514400
Micron MT : 4C4001
Mitsubishi M5M: 44400

Any idea where I could find these would be appreciated.

I'm even up to pulling the DRAM from some old boards, if I can find
someplace that has boards that contain these chips. Maybe an old
printer buffer memory card or something.

Thanks!

Keith

 

[John Livingston]

Ross Herbert wrote:

On Tue, 06 Jan 2009 04:53:17 -0900, floyd@apaflo.com (Floyd L. Davidson) wrote:

:Ross Herbert <rherber1@bigpond.net.au> wrote:
:>On Sun, 04 Jan 2009 20:36:09 -0900, floyd@apaflo.com (Floyd L. Davidson)
wrote:
:
:>:Ross Herbert <rherber1@bigpond.net.au> wrote:
:>:
:>:> voice frequency circuits were all 300 - 3400Hz in my day.
:>:
:>:The PSTN is specified from 400 to 2800 Hz, with 24 dB SNR.
:>:
:>:Individual channels on various carrier systems, and some
:>rivate line voice circuits are specified with more
:>:bandwidth.
:>:
:
:>In Australia PSTN is specified for 300 - 3400 Hz bandwidth.
:
:I doubt it.


Well let's give some examples...

When I was involved in junction commissioning (unloaded copper inter-exchange VF
junctions) with Telstra, transmission measurements were carried out over the
300-3400Hz range. This hasn't altered.

When looking at the transmission characteristics of an international telephone
exchange (ITU-T Recommendations)the only frequency range mentioned is
300-3400Hz.
http://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-Q.45-198410-I!!PDF-E&type=items
http://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-Q.45bis-198811-I!!PDF-E&type=items

And the following document recommends all channel terminal equipment be lined up
using 300-3400Hz.
http://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-G.120-199812-I!!PDF-E&type=items

Note that ITU-T G235 (3KHz spacing) is supesrseded and is no longer recommended
for international connections.

As for the specification relating to customer equipment connected to the PSTN
the frequency range used for testing is 100Hz - 4KHz.
http://www.commsalliance.com.au/documents/standards/S004:2008

In other documents from this website the definition of VF telephony or Voiceband
is 300-3400Hz.

There probably a number of other publications if I had the time to research them
but suffice to say that in Australia the VF telephony channel bandwidth is
specified as per ITU recommendations ie. 300-3400Hz.

Good, accurate stuff, Ross.

I really don't know where Floyd L. Davidson is coming from. He is grimly
sticking to an assertion the the UK and Australian PSTN is specified as
"400 to 2800 KHz", but has been unable to quote his source in terms of
unambiguous specifications.

I can only assume - from his location - that he has some experience as a
technician in military comms systems, and has some view of the US Bell
system. Hence the belief in "400-2800". As has been fully demonstrated
by several others, this is a profound misunderstanding of the
international PSTN.

This thread has wandered far and wide from the OP's question, but it's
getting a bit too far off the subject for me. It's also degenerated into
a classic battle of the Trolls.

If Floyd wishes to make further wild and inaccurate statements, perhaps
he would like to open a new thread ?

John

 

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