audio recording on IC -help wanted

[Marko]

90073 is evidently the manuf. CMC is a Canadian avionics company. Googled
CMC canada and it came up first listing. Someone probably made them for
CMC.

Also, the packages look very similar to late 70s Beckman hybrid packages.
Their DACs had the same white dot and black ceramic package, but not
identical. Mark


"Erik Baigar" <erik@baigar.de> wrote in message
news:484AE4CC.290A9499@baigar.de...

Dear experts!

In an vintage computer restoration project I came accross a couple
of custom chips. They have been made in 1981 and 1982, probably in
the UK for a military application. The circuitry around them is
entirely made from mil spec TTL chips of the 54xx series. My question
would be which company is hidden behind the manufacturer code 90073?

More details on the chips and pictures of them can be found here:

(1) Part No. 214-017, Week 12/1981, picture at

http://www.baigar.de/TornadoComputerUnit/PECchips/214017_MFR90073.jpg
(2) Part No. 214-018, Week 44/1981, picture at

http://www.baigar.de/TornadoComputerUnit/PECchips/214018_MFR90073.jpg
(3) Part No. 214-020, Week 19/1982, picture at

http://www.baigar.de/TornadoComputerUnit/PECchips/214020_MFR90073.jpg
(4) Part No. 339-446, 67 PS 00205, Week 15/1981, picture at

For those interested: The chips where used in a vintage 12bit computer
probably from a radar application. I investigated this and partially
brought it back to life during the past 4 years and now I am curious
what
these chips are doing. Maybe the (1)-(3) are arrays of resistors?

Best regards,

Erik.

 

[Marko]

www.iso-parts.com is good for some clues
67PS gave these results. Put the NSN into FLIS to get some specs

Some of thses 67PSxxxxx are resistor networks.

67PS00205 didn't show up in the search below so evidently the military never
used it, but the first NSN in the list below is 67PS00420 and it is a
resistor network.. But, the part number 67PS00205 is not necessarily a
resistor network.

The oscillator NSN below is also of the same 67PS series, so the part
numbers probably correspond to the parts list for the 67PS contract.

The following is from iso-parts search for "67PS"
View NSN Details 4310-00-479-2918 RING,PISTON
View NSN Details 5815-99-649-2607 RING,CODING DISK
View NSN Details 5841-99-659-8786 OSCILLATOR,RADIO FR
View NSN Details 5845-99-653-3271 DELAY LINE
View NSN Details 5845-99-653-4893 OSCILLATOR,RADIO FR
View NSN Details 5905-99-658-8979 RESISTOR NETWORK,FI
View NSN Details 5905-99-658-8980 RESISTOR NETWORK,FI
View NSN Details 5905-99-658-8988 RESISTOR NETWORK,FI
View NSN Details 5905-99-658-8990 RESISTOR NETWORK,FI
View NSN Details 5905-99-658-8991 RESISTOR NETWORK,FI

Parts games are so much fun, Hope this helps you, Mark


"Erik Baigar" <erik@baigar.de> wrote in message
news:484AE4CC.290A9499@baigar.de...

Dear experts!

In an vintage computer restoration project I came accross a couple
of custom chips. They have been made in 1981 and 1982, probably in
the UK for a military application. The circuitry around them is
entirely made from mil spec TTL chips of the 54xx series. My question
would be which company is hidden behind the manufacturer code 90073?

More details on the chips and pictures of them can be found here:

(1) Part No. 214-017, Week 12/1981, picture at

http://www.baigar.de/TornadoComputerUnit/PECchips/214017_MFR90073.jpg
(2) Part No. 214-018, Week 44/1981, picture at

http://www.baigar.de/TornadoComputerUnit/PECchips/214018_MFR90073.jpg
(3) Part No. 214-020, Week 19/1982, picture at

http://www.baigar.de/TornadoComputerUnit/PECchips/214020_MFR90073.jpg
(4) Part No. 339-446, 67 PS 00205, Week 15/1981, picture at

For those interested: The chips where used in a vintage 12bit computer
probably from a radar application. I investigated this and partially
brought it back to life during the past 4 years and now I am curious
what
these chips are doing. Maybe the (1)-(3) are arrays of resistors?

Best regards,

Erik.

 

[Scott Seidman]

Generalspecific <thrashaero@gmail.com> wrote in news:0c3ebada-5248-4880-
afda-4e5b05abc7b6@m36g2000hse.googlegroups.com:

I'm looking for the smallest mechanical encoder in existence that is
readily bought.
NOT one that is designed to be mounted onto motors like the one
micromo/faulhaber sells as 'world's smallest encoder.'

It would be for a small hand-turned knob to tell software what
position its being rotated.

The smallest I could find is this, but it is obsolete:
http://www.bourns.com/pdfs/3375_obsolete.pdf

Is there any at that size or smaller? Anything larger will not work.
The body has to be 6mm wide or less.

Search for rotary encoders on globalspec, and specify a maximum size of
0.1"

Looks like Heidenhein or CUI might be your best bet, and grayhill can do
custom work.

--
Scott
Reverse name to reply

 

[JimW52]

JeffM <jeffm_@email.com> wrote in
news:fc2b8535-bbc9-4329-a82f-fe4acc954327@w5g2000prd.googlegroups.com:

ElecEng wrote:
Item Manufacturer Part Number Date Code Quantity
1
2
3
4
5
6
7
8

http://groups.google.com/group/sci.electronics/msg/13651a897337a7a9?q=C
harters+misc.industry.electronics.marketplace+Discussions+Advertisement
-*-*+only-advertise+sci.electronics.components-Integrated-*-*-*+individ
ual-parts+*.*.not.a.forsale.group+zz-zz+Discussion

sci.electronics.components Integrated circuits, resistors, capacitors.

"Discussions of electronics at the component level. The use,
limitations, and identification of resistors, capacitors,
integrated circuits, connectors, enclosures, ... and so on.
Locations and contact information for Manufacturers,
Distributors, and other sources for supply and technical
information."

It seems to me that the OPs post meets the requirements.

BTW, how do you come up with your highly improbable google searches?

Jim

 

[Pierre-François (f5bqp_pf]

Hi,

As you can see it's not on the list that you can find here:

http://www.sphere.bc.ca/test/hp-parts/300-hpxref.pdf

=======================

1853-0213 02037 2x4236

1853-0217 02037 MPS 404A

1853-0218 03406 NS65098

1853-0221 01921 ZN5416

1853-0222 02037 2N491

======================

1853-0351 02037 2N6053

1853-0353 02037 MPS-U55

1853-0356 01698 TIP42

1853-0360 02037 2N3799

1853-0361 01698 2N6331

======================


Good luck

pf
F5BQP


"TourEasyPilot" <mcquate@sonic.net> a écrit dans le message de news:
486d48b7$0$17173$742ec2ed@news.sonic.net...

Anyone know of a substitute or replacement for
an HP PNP transistor, part number 1853-0357 ?

It may be a special version of 1853-0218.
How about a substitute or replacement for that one?

Thank you!

 

[Pierre-François (f5bqp_pf]

<phillipvogel@gmail.com> a écrit dans le message de news:
cddf4a50-859e-4f4e-965c-a3e9338b7a06@m73g2000hsh.googlegroups.com...

Anritsu Sitemasters Wanted

email to:
phillvogel@gmail.com

Hi to all of you,

I've tried as a test to see the serious of this request by asking the
purchase of a MINT quite recent U3661 26Ghz spectrum analyser full option.
I can tell you that their offer isn't serious at all...
It's just if you don't have to give them some money in addition...

This company is:
Test Equipment Connection Corporation
30 Skyline Drive Lake Mary FL. 32746
PHONE800)615-8378 / 407-804-1780 FAX: (800) 819-8378 /
407-804-1277
Sales@TestEquipmentConnection.com www.TestEquipmentConnection.com



Not serious guys, believe me...

pf
f5bqp

 

[Pierre-François (f5bqp_pf]

Hi,

And when I say these guys aren't serious I wheight my words!...

My MINT very new U3661 full option including the tracking generator they
wanted to buy it from me at $3500 and I discovered they are offering a less
interesting one (no tracking gen, no high stab reference, no carrying case,
no front cover) on ebay for $14 995 !!!...
More than 4 times!!!

http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&rd=1&item=200220192424&ssPageName=STRK:MEWA:IT&ih=010


What a gangsters!!!


pf





"Pierre-François (f5bqp_pfm)" <NOSPAM@MAPSON.com> a écrit dans le message de
news: 486dafa6$0$868$ba4acef3@news.orange.fr...

phillipvogel@gmail.com> a écrit dans le message de news:
cddf4a50-859e-4f4e-965c-a3e9338b7a06@m73g2000hsh.googlegroups.com...
Anritsu Sitemasters Wanted

email to:
phillvogel@gmail.com



Hi to all of you,

I've tried as a test to see the serious of this request by asking the
purchase of a MINT quite recent U3661 26Ghz spectrum analyser full option.
I can tell you that their offer isn't serious at all...
It's just if you don't have to give them some money in addition...

This company is:
Test Equipment Connection Corporation
30 Skyline Drive Lake Mary FL. 32746
PHONE800)615-8378 / 407-804-1780 FAX: (800) 819-8378 /
407-804-1277
Sales@TestEquipmentConnection.com www.TestEquipmentConnection.com



Not serious guys, believe me...

pf
f5bqp

 

[Hal Murray]

I'd like to know whether it might be feasible, from a technical and
cost-effectiveness standpoint, to use a large array of specially
designed capacitors to hold excess electricity from solar plants for,
say, periods of a week or more. This would be helpful to bridge gaps
caused by overcast weather, and for other purposes.

The problem is not holding a charge for a week, the problem is
cost and space.

Do some arithmetic. Assume that capacitors are as good as batteries,
both in cost and volume. Compute how much it would cost for
batteries (assume 100% conversion efficiency) to run your huse
overnight.

How much room would that take? Would it fit in your garage?

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

 

[François Guillet]

"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> a écrit dans le message
de news: kals645pnort2ueag6mrdocbamnp49rpvs@4ax.com...
| On Fri, 4 Jul 2008 16:16:40 +0200, "François Guillet"
| <guillet.francois@wanadoo.fr> wrote:
|
| >I'm looking for a mosfet better than 2SK544 which has high gain (27 dB at 100
Mhz),
| >low noise (NF 1.5 dB at 100 Mhz) and small transfer capacitance (0.035 pF).
| >
| >Any idea ?
| >or a site where I could search for it on the basis of these topics ?
| >
| >thanks
| >
| >fu2 sec
| >
|
| Look at the NEC phemts... NE3509 is a pretty hot part. It will have
| roughly 10 times the Gm of the 2SK thing.
|
| John

Very impressive gain.
It looks a very good candidate.

Thanks.

 

[François Guillet]

"Wimpie" <wimabctel@tetech.nl> a écrit dans le message de news:
2ce0756e-fa55-41ee-9920-c54f6196d046@e39g2000hsf.googlegroups.com...
On 4 jul, 16:16, "François Guillet" <guillet.franc...@wanadoo.fr>
wrote:

I'm looking for a mosfet better than 2SK544 which has high gain (27 dB at 100
Mhz),
low noise (NF 1.5 dB at 100 Mhz) and small transfer capacitance (0.035 pF).

Any idea ?
or a site where I could search for it on the basis of these topics ?

thanks

fu2 sec

| Hello François,

| I don't know what spec must be better (and the application), but you
| may try www.infineon.com, descretes, RF discretes, etc. They have
| various MOSFETS and SiGe transistors.

| Best Regards,

| Wim
| PA3DJS


Thanks Wim. The parametric search is very useful. It is a pity such a tool is not
provided by all manufacturers.

François F6FLT

 

[GMAN]

In article <g5b3oj$1ue$1@aioe.org>, Baron <baron.nospam@linuxmaniac.nospam.net> wrote:

Andre Majorel wrote:

Manufacturers tend not to give a figure for the number of
insertions their DIN connectors can take. I've never seen one
fail but those don't tend to be the type you plug/unplug ten
times a day. Does anyone have data or experience with that ?

Yes I do this far more often ! I've yet to have a plug fail, but I have
had the odd socket loose a leg from the mating part. After that all
you can do is replace the socket. Which sadly I've had to do several
times. Same with USB sockets. How people manage to break the plastic
tongue off beats me !

I hate DIN sockets and DC sockets where the only way the socket is anchored is

by the solder joint to the board. Why dont more of these use a screw thru the
top to anchor the socket????

 

[Scott Seidman]

Gustavo Raush <gustavo.raush@upc.edu> wrote in news:g62gbc$5un$1
@defalla.upc.es:

I have found that MOOG company offers a slip rotating rings but the
contact resistance is about 60 mOhms. May be this contact resistance is
a little high for micro-volts sources like thermocouples.

Not to mention that the connection through the slip rings is another
thermocouple!!

I don't know what kind of accuracy you need, but for best accuracy, the
thermocouple and thermocouple amplifier must be on the same side of the
slip rings.

--
Scott
Reverse name to reply

 

[GregS]

In article <g62i2q$7bu$1@defalla.upc.es>, Gustavo Raush <gustavo.raush@upc.edu> wrote:

Scott Seidman escribió:
Gustavo Raush <gustavo.raush@upc.edu> wrote in news:g62gbc$5un$1
@defalla.upc.es:

I have found that MOOG company offers a slip rotating rings but the
contact resistance is about 60 mOhms. May be this contact resistance is
a little high for micro-volts sources like thermocouples.

Not to mention that the connection through the slip rings is another
thermocouple!!

I don't know what kind of accuracy you need, but for best accuracy, the
thermocouple and thermocouple amplifier must be on the same side of the
slip rings.

Hi Scott:

Thanks for your quickly response.
The needed accuracy is about 0.3 to 0.5 şC, worst values are not allowed
because several heat transfer numerical models must to be validated.
Do you know some published article which could be explaining
experimental setup like this?. Not exactly the same but which could be
given details for an infrastructure with similar problem to measure.

If you used nice high value 100K thermistors slip ring resistance would be no
problem, just noise, and noise can be filtered. You can calibrate a temperature
to a very close resoluton, but the problem is temperature range.
Whats you range ? I lost track of the total number of channels needed, but I think your biggest problem
is getting a calibrated system using high value thermistors of 1K or more. Most systems
on the market are not that.

greg

 

[Scott Seidman]

DJ Delorie <dj@delorie.com> wrote in news:xnabgb6t0c.fsf@delorie.com:

Scott Seidman <namdiesttocs@mindspring.com> writes:
Not to mention that the connection through the slip rings is another
thermocouple!!

As long as it's the same thermocouple on both wires, it should be OK.

I don't know what kind of accuracy you need, but for best accuracy,
the thermocouple and thermocouple amplifier must be on the same side
of the slip rings.

That means you're accuracy becomes limited by the cold junction sensor
in the amplifier. If that were acceptable, a simple thermistor could
be used instead of a thermocouple.

Heck, if that were OK, put a battery powered MCU with some DS2762's
and a zigbee radio inside the tank and skip the slip rings completely.
Or an MCU with 20 thermistors.

All good points. I have a number of slip ring systems, and have often
threatened to replace them with telemetry based systems if any of the
rings broke. I'd still need rings for power, as batteries wouldn't be
an option, but that's sort of a different beast, and the ring count would
still go way down.

As to whether the extra thermocouples would do anything bad, if the
'couples were wired directly into the rings, you wouldn't have the same
thermocouples. Same if you extended the 'couples with copper wires.
I've always found thermistors to be more worry-free from such design
considerations.

--
Scott
Reverse name to reply

 

[Scott Seidman]

zekfrivo@zekfrivolous.com (GregS) wrote in
news:g62kgg$qgb$3@usenet01.srv.cis.pitt.edu:

If you used nice high value 100K thermistors slip ring resistance
would be no problem, just noise, and noise can be filtered.

I think if the temp range permits, thermistors would be the way to go.
Much easier.

--
Scott
Reverse name to reply

 

[Scott Seidman]

DJ Delorie <dj@delorie.com> wrote in news:xn63qz6njw.fsf@delorie.com:

Scott Seidman <namdiesttocs@mindspring.com> writes:
As to whether the extra thermocouples would do anything bad, if the
'couples were wired directly into the rings, you wouldn't have the
same
thermocouples. Same if you extended the 'couples with copper wires.

If both slip rings are made of the same metal and are the same
temperature, and you use a suitable thermocouple extension wire on the
outside, it works. The voltages induced by the slip rings cancel out,
just like any other metal connector you use with thermocouples. I'm
not sure what it would do for the accuracy, though - that would depend
on any thermal gradient across the slip ring assembly.

You can do it with copper wire if you take into account the
temperature of the slip rings when converting the thermocouple
reading.

So, if you have a chromel-alumel thermocouple for example, and you attach
it to a slipring of connector metal X, the chromel-X junction will
exactly cancel the alumel-X junction??

I thought you need a second chromel-alumel at a ref temp wired in, then
you could have two chromel-X (or alumel-X, your choice) isothermal
junctions that cancel each other. Actually, I'm pretty sure of this, and
there's an example at http://www.omega.com/temperature/z/pdf/z021-032.pdf

I dislike doing precision thermocouple designs, but they're really not
magic. In any case, thermistors are easier, but don't have the same temp
range, and thermocouples can be faster.

--
Scott
Reverse name to reply

 

[Larry Snyder]

"good@rock.com" <gooddad@rock.com> wrote in message
news:e5ef2810-7378-44fe-9c1b-94ec3ba72f5e@26g2000hsk.googlegroups.com...

We can make energy out of matter, and matter out of energy. With cold
fusion, we will unlock the power of the atom, and the world will have
infinite energy and be able to create matter out of energy and thus
infinite wealth.

Cold fusion is for real. Just like the light bulb it may take many
attempts to get it right.

Thomas Edison failed more than 1,000 times when trying to create the
light bulb. When asked about it, Edison allegedly said, "I have not
failed 1,000 times. I have successfully discovered 1,000 ways to NOT
make a light bulb." He then succeeded, and now the world has light.

Cold fusion is for real.

http://en.wikipedia.org/wiki/Cold_fusion


From Wired Magazine "What If Cold Fusion Is Real?"

http://www.wired.com/wired/archive/6.11/coldfusion_pr.html

"That's what makes cold fusion so nonreproducible," says Storms. "You
have to load the palladium with very high concentrations [of
deuterium], and many samples simply won't tolerate it."

"Heat has practical applications," concedes McKubre, "but what am I
supposed to do with the ability to turn expensive elements into cheap
ones?"

This, finally, is his explanation for many negative results. There's
still a snag, though. Just because he knows how to select good
palladium, doesn't mean he knows how to make it. "Pons and Fleischmann
used to test samples from a supplier, Johnson Matthey, and over the
years they figured out how to create palladium that worked most of the
time. But Johnson Matthey signed a nondisclosure agreement with
Technova, the Toyota-supported group that financed the research in
France. The Japanese thought cold fusion would be hugely successful,
and therefore everyone would want this certain type of palladium, and
they'd clean up."

Of course, it never happened. Technova abandoned cold fusion. But
according to Storms the nondisclosure agreement still exists, and
Johnson Matthey is still bound by it. (A spokesperson at Johnson
Matthey would not confirm that an agreement exists.)

"Someone should buy it from Technova," I suggest.

Storms laughs. "Why should they? It's worthless! You can't make any
money from cold fusion - at least, not using the Pons-Fleischmann
method."

And so, at this point, Storms is stymied. He shows me a paper he has
written, with a grim cover letter: "Ironically, it is now possible to
know why we failed but it is too late to follow a more successful
path ... Without access to widely circulated journals, this negative
attitude within the scientific community obviously cannot be changed.
Even overwhelming proof, as demanded by many scientists in the past,
can have no effect because no mechanism exists for it to be
communicated to the scientific professions."

See: http://en.wikipedia.org/wiki/Bubble_fusion
Replace bubbles with spherical piezo shock wave and you're there.
Larry

 

[Tom Biasi]

"Larry Snyder" <lsnyder@pacific.net> wrote in message
news:wq-dnclMsvqH_hvVnZ2dnUVZ_gOdnZ2d@posted.pacificinternet...

See: http://en.wikipedia.org/wiki/Bubble_fusion
Replace bubbles with spherical piezo shock wave and you're there.
Larry

My family is waiting, may I eat dinner first?

 

[Dan Coby]

"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote in message
news:hhed84lfllbml1q9o55q06024o2e406n47@4ax.com...

On Tue, 22 Jul 2008 22:42:13 -0500, "==Harley==" <Heat@HotHot.com
wrote:

The world may need it, but it's not gonna get it. Fusion is always 10 to 15
years away.


So are fuel cells.

John

There are real fuel cells producing real energy. I have yet to hear
of a fusion experiment producing a net positive energy.

BTW I have always heard that fusion is 20 years away. Have they
shortened the schedule?

 

[Dave Platt]

I just doing an project.

I wanna to use Solar Cell to ligth the 8.0 x 8.0 mm LED, 1.8 to 2.5V,
1200mA.

Whoof. That's a flashlight-grade high-power LED!

No idea for the regulator yet. I just want to put in my bicycle. If the LED
can work over 6 hours per day is wonderful.

Well, the LED certainly can work for that long (if you have a good
enough heatsink on it). The battery and solar panel, on the other
hand... well, getting as much power as you need is going to be
nontrivial.

You're looking at around 5 watts of power just for the LED... that's
30 watt-hours per day.

Given that the battery-charging process isn't 100% efficient, and the
regulation of current for driving the LED isn't 100% efficient, you
should probably budget 50 watt-hours per day from the solar panels if
you want to be able what you want.

These days, a typical consumer-type solar panel capable of delivering
4-5 watts of power (e.g. 400 mA at 12 volts) costs anywhere from $40
(flea-market bargain price) to over $100, and has close to 2 square
feet of panel area. These panels are fairly well suited to charging
12-volt lead-acid cells.

That's probably about the largest panel that it would make sense to
place on the back of a bike (e.g. above the rear mud-guard). And, in
order to get 6 working hours of light out of a monster LED like the
one you're considering, you're going to have to have that panel in
direct sun for the full day.

Do you think I should use the Lithium cell to store the energy?

You're going to need something reasonably sophisticated to handle this
arrangement, I think.

If you're going to need more than an ampere at 2 volts (nominal), the
issue of choosing the proper battery type and regulator are quite
significant. I'd expect that some form of switching buck regulator
will probably be most efficient, as you can draw power from a
higher-voltage battery (such as a LiION or a lead-acid gel cell) and
transform it down to a higher current at a lower voltage.

Lithium batteries are tricky to charge... they *require* a charge
control IC circuit which is correctly configured for the battery
chemistry and size. Doing it wrongly can and will damage the battery,
with consequences up to and including a catastrophic fire.

Although they're heavier, a good modern NiMH battery pack might be a
bettery choice - they're less tricky to charge.

Lead-acid are the heaviest, and (I believe) have the lowest amount of
energy storage per pound, and many types won't live very long if you
deep-discharge them regularly... but they're probably the easiest to
charge-control.

You might find that you need to use a split arrangement... have a
solar panel and charge controller at home, the LED on the bike, and
two battery packs - one installed on the bike (for use) and one
connected to the charger at home.

--
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!