audio recording on IC -help wanted

[Lurch]

On Sat, 02 Jun 2007 20:21:07 +0100, Coleman <no@no-email.com> mused:

On 02 Jun 2007, Palindrome <me9@privacy.net> wrote:

meow2222@care2.com wrote:
On 2 Jun, 02:02, "Homer J Simpson" <nob...@nowhere.com> wrote:

"Palindrome" <m...@privacy.net> wrote in message

news:js08i.234053$MW1.21635@fe03.news.easynews.com...


You can buy Permanent Mains Flex Connectors that don't involve
plugs and sockets, eg
http://www.maplin.co.uk/images/Full/VJ81C_VJ82D.jpg

"Waterproof" versions are also available, for outdoor use.


These are frowned on in many jurisdictions, however if they are
approved in the UK then they can be used there.


Whats the problem with them? Ours all have cord grips.


In the UK portable equipment has to be provided with a fitted plug
- in recognition of the fact that many people were incapable of
correctly fitting (and fusing) one themselves.

So, what are the chances that one of those will correctly choose
and wire one of the above? Or use a non-rugged one outdoors, drag
it around corners, let it fall into a bucket of water, etc?

Many (most?) do not have anything to limit the bending radius of
the cables at the point of entry close to the fixed cord grip. So
strands of the cores break, leading to the risk of fire, failure,
etc.

Few are vapour-tight or even water-tight. As the are often dragged
around through damp grass, left in the shed, etc - there is a real
risk of corrosion..

Bear in mind that a typical application is to "repair" an electric
garden tool - where the user has cut the cable...


Replacing the two cables with a single, contiguous, one is by far
the best solution.


It is the best but sometimes it is too long a job to open up the
appliance and to attach the new flex cores because of the way user-
unfriendly way in which the appliance has been designed.

Make the join at the end near to the appliance so it's not dragged
around corners all the time.
--
Regards,
Stuart.

 

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[Jeff D]

Not having success find anything on a Toshiba 2SC789-R transistor. It's part
of the pre-amp circuit from a vintage Pioneer Quad Stereo Receiver. Any
ideas ?

 

[LVMarc]

michael nikolaou wrote:

Hi

I have a 12 v relay driving an large 220 volt AC relay . Across the contact
of the driver relay i placed one RC snubber circut (27NF with 100 R
resisitor in series) to help with some spikes that were influencing the low
voltage driver circuits.
The driver circuit is able to detect mains zero crossing and fire the
driver relay at an angle i choose .
From what i read the best point to switch off the power relay is at zero
crossing . I did that and i show a large spike up to 1 KV at the relay
contact followed by a decaying 500hz waveform to 0 volts . After some
experimentation the best point came exactly when switching off at the peak
of the mains voltage .At this point there is smooth decaying waveform to 0
volt after 5 periods of 500 HZ but no overshoot. The relay presents no
arcing. If i remove the snubber and make the experiment the best place to
switch is zero crossing but i also see large SHARP spikes up to 500 Volts
Peak.
My question is
The switching with snubber must be made at zero crossing or at the peak of
an ac voltage waveform ?
What is the behaviour of the circuit ?.
As i understand any large spikes can harm the X2 capacitor i'm using so
what is the best operating practise ?.

Any help will be appreciated

Michael


Hello,

Two comments:


If the load is not purely resistive, there will be a voltage current
shift, aka Eli ICE Man... therefore in this case zero voltage crossing
is not at all zero current crossing and you may be creating more problem
by switching at the worst (or just a bad) time) .

BY looking at the signal that the rc snubber is trying to "tame" , you
adjust RC unitl you get a "critically damped response. you can dampen
more, but at the cost of higher stand by leakage via the RC, as it
becomes a part of the load too!

Good luck, this is an often asked problem, and the ability to visualizes
on scope and make changes and observations, will help you forever. This
is a re-occcuring problem and it is the variations in the load that
cause engineers to have to re-visit the solutions

Best regards

Marco

 

[krw]

In article <5021388151Spambin@argonet.co.uk>, Spambin@argonet.co.uk
says...>

In article <MPG.23e106a07e05d19698986b@news.individual.net>,
krw <krw@att.zzzzzzzzz> wrote:
If your
field strength is enough to saturate the innards there isn't much
that can be done.

Doesn't need to get into the innards directly, you can screen that, but
you've got a pair of leads forming an aerial and most likely a diode at
the junction of the test lead and the DVM socket.

Nonsense. There are many things that can be done to eliminate any
external factors. Add a shunt resistor and you have your low
impedance meter.

A low impedance input
attenuator will load that down to something insignificant compared with
what you are measuring.

Nonsense. If an input resistor will load down your circuit so will
your low impedance meter. It's *exactly* the same thing, except
the user gets the choice.

 

[Mr.T]

"Albert Manfredi" <albert.e.manfredi@nospam.com> wrote in message
news:JL4t9u.6IK@news.boeing.com...

I think everyone is saying the same thing, yet there seems to be
disagreement. I'd only add to this that when people predominantly
"choose to" behave in a particular way, rather than in some other way,
there's probably a good reason why.

Sure, what that reason is, and even how rational it is, may be open to
debate.
Mostly people choose what is readily available at an affordable price. The
manufacturers/marketing people have as much to do with this as any absolute
superiority.
And market timing plays a big part in whether something becomes widely
established, and how superior something else must be to supercede it.

For example, if people "choose to" dislike food that smells like decay,
there is probably a good reason why. Yes, even though there may be some
individuals who actually like decaying food.

Yes, blue vein cheese is quite popular. Even well aged meats.

There are other examples. Movies use deep bass sounds to put the
audience on edge. It conveys a sense of foreboding and alarm in people.
Again, one might suspect that if the reaction is close to universal,

Or not, discotecques use deep pounding bass to give their customers a dance
beat. Doesn't seem to drive them away

there's probably a good reason why. Not merely, "They choose to react
this way. They could just as easily react a different way."

Exactly.

Others and I have speculated the "why" people might prefer "warmer"
lighting. There's nothing wrong with speculation. That's what leads to
stating a hypothesis and then trying to prove it, and possibly ending up
with a physical law.

Or more likely just ending up with another example of the irrational
behaviour patterns of humans.

MrT.

 

[John G]

"Jim" <nomail@riomail.com> wrote in message
news:Xns99526A09F520B5D4AM2@127.0.0.1...

I am in the UK.

Can I build a simple device which would switch a pair of contacts
on/off
when my landline phone was being used.

Am thinking of something like this. There might be a simple reed
switch
(do such things still exist) which would close its contacts if there
was
a current on the phone line.

Perhaps I might need to improve the situation and wind the landline
(or
maybe just one of the two wires) around the reed switch.

Would something like this work?

Or can I buy a simple plug-in device for something like a fiver which
closes its contacts when the phone line is active?

There are about 1200 entries in Google about "Off Hook indicator" for
telephones.

All of which are most likely illegal in some jurisdictions.
--
John G.

 

[Eeyore]

tony sayer wrote:

Eeyore <rabbitsfriendsandrelations@hotmail.com> scribeth thus
"Floyd L. Davidson" wrote:
Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote:
"Floyd L. Davidson" wrote:

"Pulling the line low"???? Giggle snort,
cough and laugh...

A: OFF HOOK you twit.

Off hook is a loop *current* condition.

WOW. I'd never have guessed !

B: the DC resistance of the transformer primary may cause the phone to stop
working by lowering the line voltage too much.

Typically a split winding is used, with a mid-point
capacitor to block DC current.

What a load of Bollocks !

Transformers are neither needed nor used any more.

Umm... beg to differ .. they are used for 2 and 4 wire analogue or
analogue over digital voice band private circuits...

I thought we were talking POTS ?

Graham

 

Hi all,

I am looking for Embedded Controller PC87541 datasheets or other
informations related. This controller is used on Acer Ferrari 4000
notebook motherboard. It is connected to SB400 South Bridge and it
controls BIOS, FAN, KEYBOARD, TOUCHPAD, SWITCH & LED.

Thank you all for help.

 

[JosephKK]

On Fri, 11 Apr 2008 19:54:06 -0400, "NewsGroups" <spar@plaus> wrote:

"gearhead" <nospam@billburg.com> wrote in message
news:ffa75aed-3fad-437c-8ad6-0d7d9f907b81@m44g2000hsc.googlegroups.com...
On Apr 8, 2:13 pm, Wimpie <wimabc...@tetech.nl> wrote:
On 8 abr, 22:34, gearhead <nos...@billburg.com> wrote:





On Apr 8, 10:03 am, Tim Wescott <t...@seemywebsite.com> wrote:

gearhead wrote:
Hi all, I'd like to help out some friends on an antique motorcycle
forum that have a 6 volt regulator project. One of them built a
regulator on perfboard and posted the schematic. It has a couple of
things I'd tweak, but it works.
The main challenge: his regulator design doesn't incorporate current
limiting. Even the original relay-style mechanical regulators
incorporated current limiting, because the generators required it.
Somebody on the forum suggested the zxct1009, but it only comes in
surface mount which means we can't rejigger the existing perfboard
project to include the new chip. It would mean having a custom-
printed circuit board, and soldering techniques perhaps a little too
demanding for somebody building his first circuit -- which probably
describes a lot of the guys on the forum.
pdf of the circuit:
http://www.hydra-glide.com/phpBB2/download.php?id=1173
I've tried to find a through-hole component that fits the bill, but
can't seem to come up with anything just right. I saw the micrel
MIC5021, but it supposedly operates on 12 volts and up.
http://www.micrel.com/_PDF/mic5021.pdf
Now, perhaps they make that statement on the datasheet because the
chip actually also has a voltage doubler and the high side drive
needs
that kind of voltage to turn on a mosfet, and it's possible the chip
itself will actually run on a much lower voltage. But the datasheet
doesn't say anything to this effect. Has anybody used the MIC5021
and
know if it might actually turn on at say 5 volts or perhaps know of
any other through hole chips for current sensing?

This is just a suggestion, but consider the circuit below. If the
transistors are well matched Vchg should come pretty close to Vgen/10
+
47 * 0.02 * Ibatt -- and you can jigger your component values around
to
change the numbers. You'll _probably_ be able to make this work OK
with
any two unmatched (but like part-number) PNP transistors, like
2N3904's,
but you'd do better to get a matched pair (DigiKey has some Zetex
parts
that would do, if there are any through-hole ones).

Try this out with SPICE before you run with it: I just threw it down
off
the top of my head, it's not exactly like anything I've done before
nor
is it tested at all.

Vgen ___ Vbatt
o-----o---|___|---o-----o
| | -----
| 0.02 | Ibatt
.-. .-.
| |100 | |100
| | | |
'-' '-'
| |
| |
| |
|---o---|
/| | |\
| | |
| | |
Vchg | '-----o
o-----o |
| |
.-. .-.
| |4.7K | |47K
| | | |
'-' '-'
| |
| |
=== ===
GND GND

I've done plenty of scheming about how to do it with discretes. But
like you said, I'd still want to use a chip in the end, to get matched
transistors. Pairs and arrays, I see ony surface mount, including
zetex.
If I have to go that way, might as well use the ZXCT1009F in SOT-23
with pins 1.9 mm apart according to the diagram. Almost a tenth of an
inch, could probably solder it right onto the pads of a perfboard, eh?

Hello,

When you buy about 10 general purpose PNP transistors from one batch,
you will probably find several transistors that are within some mV
with same Ic.

Doesn't gain determine the balance in a current mirror? If so, one
would have to match for gain. I did match for gain last time I
experimented with current mirrors. I'd like to hear from the experts
about the need for this.

When you design the 2 transistor current sensor at low
bias current, self heating can be neglected and it saves you from
soldering SMD devices like NXP's BCM857. When matching is impossible,
you might add a trimmer potentiometer for nulling.

best regards,

Wim
PA3DJSwww.tetech.nl

About temperature matching. I calculate that one tenth of a degree
centigrade difference between the transistors in a mirror would add
about one percent error to the current mirror. I wouldn't want
temperature vagaries causing any more error than that.



For C> sakes! You are talking about a motorcycle here. 1% up or
down will not make an ioata of difference to the battery charging on the
bike.



I'm wondering
if you could count on discrete transistors on a board to stay within a
tenth of a degree to each other. More fodder for the experts.

It is not 1 percent, it is 1 percent per degree C. if you have a 10
degree C temperature difference change you get a 10 percent unbalance.

 

[robb]

woot and and hardy THANKS ! to all the help,

more small problems with questions at the bottom if you want to
skip the story ....

short version:
----------------
- robb repairs non-problem on working ('85) micro-board with 32v
rampage on the 5v rail (32v rails meets 5v rail) bad joke,
nothing repaired, everything broken
- ** lots of help from "sci.electronics.*"
- many IC casualties including the MCU (SAB 8031) and ROM (NEC
D23256AC) **BIG** ROM problem
- ** lots of help from "sci.elec.*
- much searching and patience then access to good ROM *but* many
problems reading
- ** lots of help from "sci,elec.* and "rec.games.pinball" and
"alt.microcontrollers.8bit"
- woot --- ROM copied and image working


Details:
-------------
- ROM mistakenly treated as 27c256 variant. so, bad reads and no
pin play helps
- ROM turns out to be maskable, address latching. so need a slow
or latching alogortithm
- helpful advice says try 87c257
- The programmer supports it and it worked --- good ROM read
- Programming , no joy with 27c256 variant ROMs as a new ROM host
even though in theory it seems they should work
- new 87c257 arrive and work
**BUT**

Problem:
-----------
On the 87c257 (Pin 1) is (~AS, addr strobe) is the latching
signal. However, the (D23256) used falling edge of (OE) same as
(G) as the address latch ??

so 87c257 only works if i lift (Pin 1) out of socket and jumper
to a suitable/safe address latching signal

Question (s):
- both (OE) and (CE) work as surogate latch but which is better
choice ?
- what is the best/proper way to solve this problem or do this
jumpering ?? just solder a jumper wire across the pins ? should i
use resistor, diode, other ?
- how to deal with dangling (Pin 1) fold it up, clip it, etc
- Is it possible to get the 27c256 ROM without adding latching
mechanism around them
any suggestions on what pieces i would need to build a
latching mechanism

thanks again for any helpful advice,
robb

 

[Bobby]

.... you would'nt happen to have a pair of brown shoes laces, would you?

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keep updating latest styles and stocks every day, if there are on the
stocks,drop shipping business is also welcome; At the same time, we
also accept small order to satisfy all cheapers. One pair or piece is
the mini order for all our goods. . Our shoes are popular all over the
world with High Quality, Competitive Price, Best Service and
Safe.Delivery .We can assure you that you will be satisfied with our
shoes and service. We hope to
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contact us:
pls link google search
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[Eeyore]

martinwiseman wrote:

Hi,

A customer of ours wants to know when the 68332 processor which we use
in their product was first introduced to the market and I've been
unable to find an answer.

I know that I used a 16MHz part in a design in late 1992, I have an
instruction manual for a development board dated May 1992, and I've
found a paper data book for the chip itself with a copyright date of
1990 (but no version number), however we were hoping to narrow it down
a bit better than that.

I'm hoping someone out there used it when it first came out and can
remember when that was.

Can anyone help?

" SPECIAL TO THE NEW YORK TIMES
Published: April 18, 1989

LEAD: Motorola Inc. introduced a new family of chips for computer control of
automobiles and electronic appliances.

The new 68332 microcontroller is based on the 68020 microprocessor used in some
personal computers and work stations."

http://query.nytimes.com/gst/fullpage.html?res=950DE7DE1431F93BA25757C0A96F948260

http://www.google.com/search?&q=68332+motorola+introduced

Graham

 

[Michael A. Terrell]

krw wrote:

In article <2ca5b3htomfr5k4i15bti67rmhi6sj5r8c@4ax.com>,
BugalowBill@AbbeyRoad.UKCOM says...
On Fri, 03 Aug 2007 03:29:43 GMT, Lostgallifreyan <no-one@nowhere.net
wrote:

krw <krw@att.bizzzz> wrote in
news:MPG.211c681cfa3cdea798a885@news.individual.net:

You do realize that "ChairmanOfTheBored" is another Dimbulb sock
puppet. He has drawers of 'em. He has to. They're never washed.


Yes. I don't know which one though, it doesn't matter much. I can tell a
troll quickly enough so I never need to track their history. The only thing
that puzzles me is: is he as Crass as he thinks he is? > And if he
doesn't recognise that reference, then he definitely is.


You're an idiot.

Jees, Dimbulb, How many socks do you wear in a day?

--
Keith

When he runs out of socks, he just switches to fishnet stockings and
garter belts.

--
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

 

[JosephKK]

On Fri, 18 Apr 2008 09:18:41 -0700 (PDT), gearhead
<nospam@billburg.com> wrote:

On Apr 17, 9:16 pm, JosephKK <quiettechb...@yahoo.com> wrote:
On Fri, 11 Apr 2008 19:54:06 -0400, "NewsGroups" <spar@plaus> wrote:

"gearhead" <nos...@billburg.com> wrote in message

About temperature matching.  I calculate that one tenth of a  degree
centigrade difference between the transistors in a mirror would add
about one percent error to the current mirror.  I wouldn't want
temperature vagaries causing any more error than that.

For C> sakes! You are talking about a motorcycle here.  1% up or
down will not make an ioata of difference to the battery charging on the
bike.

I'm wondering
if you could count on discrete transistors on a board to stay within a
tenth of a degree to each other.  More fodder for the experts.

It is not 1 percent, it is 1 percent per degree C.  if you have a 10
degree C temperature difference change you get a 10 percent unbalance.- Hide quoted text -

- Show quoted text -


At 300K and Vf=.6, a change of 0.1 degree would result in delta Vf =
200 uV.
At a current decade for every 60 mV, that introduces an error (added
to existing offset) of 10^.003333 = 1.0077 or about eight tenths of
one percent.
At Vf = .7, it comes out closer to 0.9 percent.
So I get a round figure of about one percent error in the current
mirror for each tenth of a degree temp mismatch centigrade in the
transistors.

So you are paying attention after all. Good. Transistors not on the
same die are difficult to keep within a few degrees of each other. In
this case thermal design matters.

 

[Franc Zabkar]

On Wed, 04 Feb 2009 18:15:23 -0600, Steve <s@s.c> put finger to
keyboard and composed:

On Thu, 05 Feb 2009 07:05:07 +1100, Franc Zabkar
fzabkar@iinternode.on.net> wrote:

On Tue, 03 Feb 2009 20:45:59 -0600, Steve <s@s.c> put finger to
keyboard and composed:

I'm trying to find the specs for a diode out of an LCD TV. The TV
model # is LC-15SH7U, made by Sharp. The diode designation is D910.
The best I can tell is it's a clamp for the 33V supply, but I'm not
sure, I can't find the service manual anywhere. The markings on the
diode are as follows:
ZC (perpindicular to diode axis_
43
7*4 (the asterisk is just a dot)
both the 43 and 7*4 are underlined, the 7*4 has a second underline.

The body measures .09in wide, .12in long.

Unfortunately, it's dead shorted so I can't find out what the voltage
was. It's labeled on the board as a zener.

Thanks for any help,
Steve

I don't know about digital sets, but a 33V supply in an analogue TV is
usually required for generating tuner voltages.

For example, my Sanyo set uses a uPC574J 33V tuning voltage reference.
It has a low temperature coefficient (+/- 1mV/degC) and low dynamic
resistance (10 ohms). Some early Philips sets used a TAA550B.

Here is an NTE "Integrated Circuit Voltage Stabilizer for Electronic
Tuner":
http://www.nteinc.com/specs/600to699/pdf/nte615p.pdf

FWIW a ZC43 diode cross-references to an NTE5145A which is a 43V 5W
zener.

See http://www.nteinc.com/specs/5100to5199/pdf/nte5111a.pdf

There are also TZC43, TZC43A, TZC43B, CTZC43C, CTZC43CA, and CTZC43CB
devices which cross to NTE4944 and NTE4945 "Surge Clamping,
Unidirectional Transient Overvoltage Suppressors":

http://www.nteinc.com/specs/4900to4999/pdf/nte4903_99.pdf

None of the above devices matches your stated dimensions, though.

- Franc Zabkar

Looks like Zack hit the nail on the head.
http://www.datasheetcatalog.org/datasheet/toshiba/3588.pdf
The layout is the same as the diode I have. I've never heard of ZC
series diodes before.

The voltage is labeled as Vt, so that could easily be tuner voltage.
There's still something wrong w/ the set, but at least now I can put
this mystery to bed.

Thanks for all the help,
Steve

It could be that your mystery diode is a protection zener that goes
sacrificially short circuit when an overvoltage condition develops.
Some Sharp VCRs employ a crowbar zener across the 30V rail for this
purpose. IME the root cause of the problem in the case of a VCR has
always been a bad electrolytic capacitor on the primary side of the
PSU.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

 

[Didi]

I know. That's just the problem, here we have to deal with cell phones
that are just a foot or two away from the amp and shielding is a major
challenge on this one. So a JFET that could reliably deliver around
5nv/rtHz at 20Hz would be great

I would try the OPA627 of Burr-Brown (ok, TI). They don't get any
better
than that - the speed should be fine for you, noise too.
But it is not dual...
A similar - but somewhat noisier and a bit more than somewhat slower,
but dual is the OPA2107, perhaps it would do.
However, the way this sounds I would be pretty sceptic that much can
be achieved without shielding. The cellphone here drives the power
supply
of the TV-set mad from 1 ft... what 80+ dB.

Dimiter

------------------------------------------------------
Dimiter Popoff Transgalactic Instruments

http://www.tgi-sci.com
------------------------------------------------------

On Nov 13, 7:24 pm, Joerg <notthisjoerg...@removethispacbell.net>
wrote:

Jan Panteltje wrote:
On a sunny day (Tue, 13 Nov 2007 16:40:37 GMT) it happened Joerg
notthisjoerg...@removethispacbell.net> wrote in
9sk_i.22629$JD.15...@newssvr21.news.prodigy.net>:

Shielding is going to be a
major pain in the neck in this application.
But you will have to.
Metal case
All inputs and outputs including power.
Do not blame it on the chips.
(Well there may be some chips.....)


It's not completely possible in this app. Maybe we can find a JFET or
MOSFET that's low noise instead.

Joerg, I find this difficult to answer.
It seems to me however, if I make something with say -80dB noise level,
that that should stay -80dB, even when somebody puts a cellphone on top of it.
Else what good is a noise spec?
We will only see more and more use of the spectrum, Wimax is coming,
the higher bands will be used too, EU is working on an "EU wide' spec
that would leave much more space for unlicensed applications, and give complete freedom
for the modulation type... Expect at lot of RF.
http://www.heise.de/newsticker/meldung/98895

I know. That's just the problem, here we have to deal with cell phones
that are just a foot or two away from the amp and shielding is a major
challenge on this one. So a JFET that could reliably deliver around
5nv/rtHz at 20Hz would be great

--
Regards, Joerg

http://www.analogconsultants.com/

 

[Al]

On Sat, 07 Jun 2008 20:12:02 -0700, JANDRMUSICWORLDSUXMOOSEWANG wrote:

J&R Music World in NYC.

They are tiefs

Nonsense, I got my order processed quickly and the equipment works
perfectly. That was my experience. What was your problem?

Al

 

[UltimatePatriot]

THAT WHEN THE MANAGER AT VISTA APARTMENTS ANSWERS HE WOULD TELL THEM
HIS NAME AND WHEN THE MANAGER PICKS UP THE OPERATOR SAYS YOU HAVE A
COLLECT CALL FROM AND SAYS TO MICHAEL CALLER SAY YOUR NAME AND MICHAEL
SAID BUZZ OFF ASSHOLE AND THE MANAGER AT VISTA APARTMENTS SAID FUCK
YOU AND THE OPERATOR HUNG UP ON VISTA APARTMENTS AND TOLD MICHAEL I
CUT YOU TWO OFF.

 

[starfire]

I've know 27R on a resistor is 27 ohms but what is 300R on an inductor? Is
it 300uH?

Dave