audio recording on IC -help wanted

[Mikko Syrjälahti]

I'm looking for a way to add a TNC connector to our PCB. The PCB will have
micro stripline or grounded coplanar waveguide circuit to which the signal
has to connect. 50ohms as usual.

Most PCB connectors seem to have two wires coming from the end of the connector
and I strongly suspect their matching integrity.

Does anyone know of suitable connector or matching characteristics of the forementioned
type of TNC connectors ?

--
Mikko OH2HVJ

 

Link for Joining the FPGA/CPLD Design Group on LinkedIn

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[Michael A. Terrell]

"networkinghardware.net" wrote:

QTY 1 each

This is not a "For sale" newsgroup. Any electronics related sale
messages belong on <news:misc.industry.electronics.marketplace> or
<http://groups.google.com/group/news:misc.industry.electronics.marketplace?hl=en>
for Google users. which was created for that purpose.

http://www.faqs.org/ftp/usenet/news.announce.newgroups/sci/sci.electronics-reorg


--
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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[Franc Zabkar]

On Fri, 5 Sep 2008 09:22:49 -0600, "Not Really Me"
<scott@validatedQWERTYsoftware.XYZZY.com> put finger to keyboard and
composed:

Can anyone identify this part?
Fool that I might be, I'm trying to repair my Hitachi 36UX01S television. I
followed the troubleshooting charts for no Vertical drive and it tells me
that I should have 28V at the input to the drive chip. It has zero, so it
lists the drive chip, a diode (half wave rect off the transformer), or "E601
open" as the problem. E601 on the schematic is a rectangle with a circle on
each end and the value 1000. I don't recognize the symbol.

The kicker is that I can find it listed from parts suppliers on the net, but
it is $93, which strikes me as insane for a 2 pin part the size of a film
resistor.

Scott

The supply to the vertical output chip is usually taken from a winding
on the flyback transformer. The pulse is rectified by a diode and the
rail is protected by a low value fusible resistor, usually only a few
ohms. I'm guessing that the "DY" in the part number/description refers
to Deflection Yoke, "32V" may refer to the voltage rating (?) or the
size of the CRT in inches (?), and 110 may be the size of CRT in
degrees.

In fact the parts list in the service manual has three occurrences of
E601:

E601 BY00821 DY-32V 110 SVC
E601 AZ00102M PROTECTOR(CRXT491001)

and

E601 BY00821 Deflection Yoke Assy.

So it looks like two items have erroneously been given the same
circuit designation.

You should be looking for a protector device, ie the AZ00102M which
sells for $2.95, not a BY00821 deflection yoke costing $93. A low
value fusible resistor should do the job. I'd use circuits for
similarly sized CRTs (36") as a guide. The "1000" in the circuit
diagram may be a current rating in mA. You can use an ordinary 1A fuse
while troubleshooting to verify that the IC and yoke are OK.

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

 

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[ehsjr]

Paul Luggar wrote:

If you use a DC relay on an AC signal it will rattle without modification!
(;-)

Yes - but not loud enough. The mod would be to somehow affix
a diaphram as Al suggested. I wouldn't energize it through
its own contact - that's likely to destroy the contact sooner
or later, which would defeat the thing.

Ed

 

[Lostgallifreyan]

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.

 

[maxi]

what are the data of IGBT Semikron :SKM158m010



Thanks

 

[swapu]

A capacitor is an electrical/electronic device that can store energy
in the electric field between a pair of conductors (called "plates").
The process of storing energy in the capacitor is known as "charging",
and involves electric charges of equal magnitude, but opposite
polarity, building up on each plate.

http://electronicstopics.blogspot.com/2008/10/capacitor.html

 

[Albert Manfredi]

"Mr.T" <MrT@home> wrote in message
news:4696e302$0$16207$afc38c87@news.optusnet.com.au...

"Dave Plowman (News)" <dave@davenoise.co.uk> wrote:

Fluorescent lights have been around for a long, long time. And early
ones
were all cold compared to tungsten. People could easily have got used
to
them for domestic light, but very few chose to.

They chose not to, exactly what I said.

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.

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.

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

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.

Bert

 

[Eeyore]

mark krawczuk wrote:

hi, can some one tell me what this GAL16V8D pal chip actually does ? in a
simple way........?
i have downloaded the data sheet , but it doesnt make much sense to me ,
hopefull some one can explain it in a basic way ?

It's a programamble chip, intended to replace typical 'glue logic'.

If you're trying to fathom what one does in a piece of equipment you're trying
to reverse engineer, you're stuck without the programming details.

Graham

 

[robb]

hello,
I am trying to find a compatible replacement for an obsolete hard to find
part SN75518N

Afer much searching and reading and learning i thought maybe i could build a
compatible circuit to perform same function as SN75518 ? I think i can
cascade 2 of the MAX6971 to cover what is used on the 75518.

could someone look at these and see if i am on track or lost ?

if lost... can someone give me a landmark ?

use 2 of these
http://datasheets.maxim-ic.com/en/ds/MAX6971.pdf

to build this (-2 od the outputs)
http://focus.ti.com/lit/ds/symlink/sn75518.pdf

to drive a 16 alpha-numeric char VFD (16 segment)


thanks for your time and help,
rob

 

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[gearhead]

On Dec 20, 11:55 am, gearhead <nos...@billburg.com> wrote:

I have a circuit that calls for a constant current sink. The LM317
would be perfect, but it requires about 5 milliamps to operate. It's
too much for my battery-operated circuit to drain 5 mA all the time.
So I'm looking for a 1.2 volt three-terminal series regulator like the
LM317 that can run on lower current. 100 uA would fit the budget.
I remember a thread some time ago on sci.electronics.design where
somebody mentioned a three terminal negative regulator (pretty sure it
was Joerg) that can run on microamps. Might have actually been a 2.5
volt regulator, don't remember. I even remember looking up the
datasheet, but I can't remember the part number.
I spent some time slogging through the parametric parts search on
digikey but didn't find it. I came here to see if anybody knows the
part.

Starting to remember now. It wasn't a negative series regulator Joerg
mentioned; it was a shunt refernce, LM385.
I think what I have to do is make the current sink using a low-power
shunt like the tlv431 or lmv431 and a transistor.
But if anybody can think of a low-power three-terminal regulator
(either positive or negative), give a shout.
Thanks

 

[Franc Zabkar]

On Tue, 5 Jun 2007 21:17:56 +0100, "Paul Luggar" <luggsey@hotmail.com>
put finger to keyboard and composed:

Can anybody confirm for me that a NEC 3SK299 is a drop in replacement for an
NEC 25118?
I need a NEC 25118 but I can't get them anywhere unless I have 3000!
Thanks.

Here are the datasheets:
http://www.ortodoxism.ro/datasheets/nec/NE25118-T1.pdf
http://www.ortodoxism.ro/datasheets/nec/3SK299.pdf

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

 

[Lostgallifreyan]

P. <dit3_werkt_ook_niet@hotmail.com> wrote in
news:0hcjn4h85q514bh0hg5o88jkop8vhdmga3@4ax.com:

When you google for the part, you find a lot of Chinese companies
offering them. So they must all be fake?

Or another manufacterer picked up the 4074 name?

Don't ask! Ultimately you'll be told what someone thinks you want to hear.
That's why those shysters exist, they know there are always people who do
this. If you really want to know, look for the details. Once you find a
detailed description, maybe even a data sheet, and perhaps even a second
primary (manufacturing) source of such data, then you can assume it exists
After all, it works for damn near all parts that do. If someone with lots of
numbers and no data offeres you stuff as rare as hen's teeth, don't touch
them with a ten foot pole. No beanstalk is EVER going to grow from those
beans.

 

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[robb]

"Eric Smith" <eric@brouhaha.com> wrote in message
news:m3d4ta9dg6.fsf@donnybrook.brouhaha.com...

robb wrote:
Are there any tricks anyone knows or used to enable a read
of
the data off seemingly dead ROM chips ?

Yes. For masked ROMs you can decap the part and read it
optically.

Decap is easy for ceramic; you can just break it open. For
plastic
packaged parts, it involves fumic nitric or sulfuric acid, so
you'd
be best advised to send it to a lab.

Once you can see the die, under a microscope you can
distinguish
the one bits from the zero bits. Generally that is the
presence or
absence of a metal contact. Whether the presence represents a
one
or a zero depends on the specific part number, and might vary
within the array (i.e., it might be presence=1 for the left
half
of the array and absence=1 for the right half).

You also will need to determine the layout of the bits. The
address
lines are divided into those that address rows and columns.
Study
of the decoder circuitry on the perimeter of the array can help
determine this.

If you can take a sufficiently high-resolution photomicrograph
of
the die, once you've determined the mapping you may be able to
write software to extract the bits, so that you don't have to
do
it by hand.

None of this is easy, but there is an existence proof that it
is
possible. Peter Monta optically dumped three ROMs from the
HP-35
calculator. These stored 2560 bits each, and were made in 1972
using
ten micron process geometry, The 23256 is a much newer part in
a smaller geometry, which means you'll need better resolution
for
the photomicrograph, but it still should be quite possible.

http://www.pmonta.com/calculators/hp-35/

Or you can just buy another unit of the model the 23256 came
from.

Eric

thanks eric,
i think your last idea is more possible/probable and thrifty

thanks again for help,
robb

 

[CWatters]

"Gaetan Mailloux" <ba221@FreeNet.Carleton.CA> wrote in message
news:f4p6kr$51b$1@theodyn.ncf.ca...

Heinz Liebhart (lovelyhard hotmail.com) writes:
On 13 Jun 2007 14:37:46 GMT, ba221@FreeNet.Carleton.CA (Gaetan
Mailloux) wrote:


Hello


I would need to find a Analog to Digital Converter IC to do data
acquisitions
with a Pc computer using the parallel port.

Anyone know some analog to digital converter IC with sampling rate over
400
khz who can be good for that ?

IMO your problem would not be getting a simple ADC for doing that, the
major prob I see is getting 400k/sec over a parallel port. What about
a simple microcontroller doing the ADC for you and sending the data
via RS232? BTW, wich accurcy, resolution, ...?

For 8bit it should be possible with data rates of modern RS232
equipment. (e.g. 460800 baud = quad 115200) You will avoid timing
probs due to the non realtime OS, too.

Regards,
Heinz

400,000 x 8 = 3.2Mbit per second. No PC has RS232 ports that fast.