audio recording on IC -help wanted

mroberds@worldnet.att.net wrote:

Using an advanced search technique known as
http://www.google.com

my internet connection here at sea (satellite, multiplexed on top
of other circuits with internet being lowest priority), yields a
bandwidth of 250 Hz (not a misprint) on average. Sometimes, I can get a
full voice channel of pipe.... 2.4 kiloHertz

You'd be amazed at how strongly the internet has become configured with
the presumption that users have hundreds of kilohertz of bandwith, if
not Megs.

 

[:-)]

Rich Grise wrote:

On Fri, 17 Feb 2006 23:05:40 +0000, nospam wrote:


"JeffM" <jeffm_@email.com> wrote:


The Best Pair II resistor calculator program will...
Tim

...then there's the old standby by Terry Harris at RSW's site
(Nearest; Series; Parallel; Divider):
http://72.14.207.104/search?q=cache:ULaUZ9H9IGQJ:www.armory.com/~rstevew/Public/Software/+zzz+ResCad.zip


Updated :-

"It now supports E192 range and supports selection from mixed ranges.
It no longer rounds input values to 3 significant digits. It can run
multiple instances (which is more a bug than a feature)."

at http://web.newsguy.com/pentangle/ResCAD20.zip


The number of times that I've had to select values from a range like
that, I've done it "by hand" with a spreadsheet. ;-)

Although, it would be kind of a fun programming project - maybe I'll put
up a "divider calculator" web page. ;-)

Cheers!
Rich

Thoses calculators are great but where can I find a list of commercially
available resistances ?
Thanks

 

[Walter Harley]

"" <a@b.c> wrote in message
news:6GyKf.7574$Jb7.832006@weber.videotron.net...

Thoses calculators are great but where can I find a list of commercially
available resistances ?

Googling revealed a nice web page at
http://www.kpsec.freeuk.com/components/resist.htm.

In general, resistors are available in various series depending on the
tolerance. The values repeat in each decade, and the tighter the tolerance,
the more values in the series. For instance, the 20% series contains 10R,
15R, 22R, 33R, 47R, 68R, and then in the next decade 100R, 150R, ... and so
forth. These days, one mostly finds 1% and 5% resistors. Technically the
1% series has different values than the 5% series (for instance, the 5%
series contains the value 2.2, where 1% contains 2.21), but some
manufacturers make the 5% series values available in 1% tolerance for the
sake of continuity with older designs.

Any distributor's catalog will list resistance values. For instance, in
Mouser's current catalog, take a look at
http://www.mouser.com/catalog/625/488.pdf.

 

[JeffM]

Thoses calculators are great
but where can I find a list of commercially available resistances ?

My fav:
http://www.logwell.com/tech/components/resistor_values.html

A backup:
http://home.san.rr.com/nessengr/techdata/stdresval.html

(Assuming you can get them to display in your browser;
neither of these turkeys knows how to construct a proper HTML page.
http://validator.w3.org/check?uri=http://www.logwell.com/tech/components/resistor_values.html
763 errors
http://validator.w3.org/check?uri=http://home.san.rr.com/nessengr/techdata/stdresval.html
764 errors)
..
..
BTW, when you respond,
it's OK to delete 18 of the previous 19 blockquotes in the thread
--and to trim out anything which YOU aren't addressing.

 

[:-)]

Walter Harley wrote:

Thoses calculators are great but where can I find a list of commercially
available resistances ?


Googling revealed a nice web page at
http://www.kpsec.freeuk.com/components/resist.htm.

Thanks

 

[:-)]

JeffM wrote:

but where can I find a list of commercially available resistances ?



My fav:
http://www.logwell.com/tech/components/resistor_values.html

Nice one Thanks !

A backup:
http://home.san.rr.com/nessengr/techdata/stdresval.html

 

[Sambo]

Wolfgang Mahringer wrote:

Hi unknown,

saturnlee@yahoo.com wrote:

I look at the mosfet under strong sunlight, now i see the marking.
The marking is 32no3L ,not sure whether the o is zero or letter "O"


So it is a 32N03L Mosfet.

But like the others say: you don't know what else is defective.
Trash it. Really.

Not of much help,
Wolfgang

Are we talking bottom left? seams to be something on there in the picture.

Anybody tried UV or black light for such weak markings?

 

[Patrick - townt.com]

Dear sirs,

We do have stock of Vishay 2N6661 in TO-39.

Can you pleased tell us if you need the stock ?

Waiting for your idea !

Thanks !

--
Patrick Cheung
townt.com
Address : 1805, Wu Sang House, 655 Nathan Road, Mongkok, Kowloon, Hong Kong
Tel : +852-25055838
Fax : +852-25058121
E-mail : patrick.cheung@towntarget.com.hk
Web-site : http://www.townt.com/towne/ or http://www.towntarget.com.hk



"maxi" <maxitubo@virgilio.it>
???????:1140594788.699437.210360@z14g2000cwz.googlegroups.com...

Hi,

what can i use in sobstituition of 2n6661?


Thanks for any help

 

[Tim Williams]

"Sambo" <sambo@void.com> wrote in message
news:1f32a$43fb9b96$d8fea00d$30783@PRIMUS.CA...

Anybody tried UV or black light for such weak markings?

I have some weak, laser etched? transistors. A light smear of heatsink
grease gives some contrast.

Tim

--
Deep Fryer: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms

 

[Ross Herbert]

On 21 Feb 2006 23:53:08 -0800, "maxi" <maxitubo@virgilio.it> wrote:

Hi,

what can i use in sobstituition of 2n6661?


Thanks for any help

2N6661 http://www.supertex.com/pdf/datasheets/2N6661.pdf

Why do you want to substitute? If you need single or small qty then
try;
http://www.calpedel.it/
http://www.beltel.it/bel/isal/hi1i2idedel.html

 

[Sambo]

Tim Williams wrote:

"Sambo" <sambo@void.com> wrote in message
news:1f32a$43fb9b96$d8fea00d$30783@PRIMUS.CA...

Anybody tried UV or black light for such weak markings?


I have some weak, laser etched? transistors. A light smear of heatsink
grease gives some contrast.

Tim

--
Deep Fryer: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms


Oh, yeah get it wet or dirty and wipe the smoother surroundings.

Thanks.

 

[bg]

DaveC wrote in message
<0001HW.C02498F70180E313F02845B0@news.readfreenews.net>...

It's in an old (mid-80's) industrial machine. The French mfr. is out of
business. The circuit I'm trying to resurrect takes a digital measuring
encoder as input and displays the measurement on 7-segment LED displays.
Display went wonky for a few weeks, then went blank, entirely. DC voltages
and ripple are all good. Tried reseating socketed components; no joy.

Lacking any documentation, I'm going to try some "shotgun" troubleshooting
by
replacing the major components on the board (they're socketed).

Large components include:
D8085AHC
D8155HC
D8279C-2
uPB8212C
All parts NEC mfr.

When replacing with components available today, what are my limitations?
(For
example, I know "H" means HMOS, and that is a "must".) What else should I
be
careful re. the letter digits of the p/n's when selecting parts with the
same
numerical digits of the p/n's?

I know that the 8279 is a programmable controller, so replacing that
without
having the source code to program it with, is out of the question.

Just trying to help a client keep this otherwise good machine in service
and
avoid "binning" it.

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group

I do believe that the 8279 is not a programmed device. I could go look it
up, but that would take work!
The 8279 was often used for keyboard input and display output. The display
will be multiplexed. There
should be a BCD to seven segment converter chip that drives all of the
displays in parallel. Then each display will have a power transistor that
switches Vcc on for that display. The power transistors on signal is sync'd
to the BCD word so that the data appears on the correct display. Make
sense?

 

[DaveC]

It's in an old (mid-80's) industrial machine. The French mfr. is out of
business. The circuit I'm trying to resurrect takes a digital measuring
encoder as input and displays the measurement on 7-segment LED displays.
Display went wonky for a few weeks, then went blank, entirely. DC voltages
and ripple are all good. Tried reseating socketed components; no joy.

Lacking any documentation, I'm going to try some "shotgun" troubleshooting by
replacing the major components on the board (they're socketed).

Large components include:
D8085AHC
D8155HC
D8279C-2
uPB8212C
All parts NEC mfr.

When replacing with components available today, what are my limitations? (For
example, I know "H" means HMOS, and that is a "must".) What else should I be
careful re. the letter digits of the p/n's when selecting parts with the same
numerical digits of the p/n's?

I know that the 8279 is a programmable controller, so replacing that without
having the source code to program it with, is out of the question.

Just trying to help a client keep this otherwise good machine in service and
avoid "binning" it.

Thanks,
--
DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group

 

[Scott in Baltimore]

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SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM
SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM SPAM

 

[Franc Zabkar]

On Thu, 02 Mar 2006 03:22:10 GMT, Ed <ed@NOSPAMmicra.org.uk> put
finger to keyboard and composed:

Hi All,
I'm hoping you can help me. I'm after an eprom programmer that can
read/write to a Hitachi HN27128ADJ-20 (or compatible) Eprom.

Its the eprom that stores the fuel and ignition maps on my cars ECU, and
I would like to try and do a hex dump to see what is stored on it, with
the aim to make some corrections.

I am familiar with PIC programming and methods etc, but have never delt
with an eprom directly before.

Thanks

You may be able to use Uniflash to read the EPROM using the boot ROM
socket of an old NIC:
http://www.uniflash.org/hardware.htm#PCI

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

 

[usmgn]

We are an OEM manufacturer in SZ that are able to help your project.
Can u pleased send us your BOM, GERBER or TESTING information for quote?

I search a "standart" module. Not to produce a "home made" design.
Thanks for your interest

Denis

 

NO SPAM wrote:

Meowmee wrote:
HI,

I am looking for a store in Los Angeles area that I can go and shop for
IC circuits and components. Where should I look for stores like this
and if anyone know any stores of this kind?


Check out the local Fry's electronics. Not that they have that
great a selection, tho. It depends on what you want.

I'll 2nd the request. Any good places near L.A.? Fry's only carries
some NTE parts. Signal Electronics in Torrance carries even smaller
amounts of NTE, but also has a few dozen JameCo.com and an equal amount
of Philmore parts; i.e., nothing to brag about. Torrance electronics
seems a little better in some areas, perhaps harder to find NTE &
JameCo parts, but has less over all unless they're hiding them behind
the counter; e.g., just found a Sample & Hold chip at Torr. Electronics
that Fry's and Signal only have in their dreams.

Isn't there anything in the entire L.A. or Orange county? Something
like a nearby Digikey would be outrageous!

Paul

 

[Tim Shoppa]

pmlonline@gmail.com wrote:

Isn't there anything in the entire L.A. or Orange county? Something
like a nearby Digikey would be outrageous!

All Electronics in Van Nuys and C&H Surplus in Pasadena have common
hobbyist parts and a real good selection of consumer and industrial
surplus (aka "junk").

Marvac Electronics stores are in the region, they mostly do
repair-oriented stuff but they are more than just ECG/NTE.

Nothing like the selection available overnight from
Digi-Key/Mouser/etc. though.

Tim.

 

[JeffM]

I'll 2nd the request. Any good places near L.A.?
Isn't there anything in the entire L.A. or Orange county?
Paul (pmlonline @ gmail.com)

Pickings are generally slim.
I'll echo Shoppa's Digi-Key/Mouser advice.

You can try
Action Electronics in Santa Ana near Edinger & Grand
(next-door to where the ACP Swap Meet is held).
Orvac is in Fullerton near Orangethorpe & Raymond.
Tim already mentioned Marvac (Costa Mesa et al).

 

[Rich Grise]

On Tue, 14 Mar 2006 07:58:41 -0800, pmlonline wrote:

NO SPAM wrote:
Meowmee wrote:
HI,

I am looking for a store in Los Angeles area that I can go and shop for
IC circuits and components. Where should I look for stores like this
and if anyone know any stores of this kind?

Check out the local Fry's electronics. Not that they have that
great a selection, tho. It depends on what you want.

I'll 2nd the request. Any good places near L.A.? Fry's only carries
some NTE parts. Signal Electronics in Torrance carries even smaller
amounts of NTE, but also has a few dozen JameCo.com and an equal amount
of Philmore parts; i.e., nothing to brag about. Torrance electronics
seems a little better in some areas, perhaps harder to find NTE &
JameCo parts, but has less over all unless they're hiding them behind
the counter; e.g., just found a Sample & Hold chip at Torr. Electronics
that Fry's and Signal only have in their dreams.

Isn't there anything in the entire L.A. or Orange county? Something
like a nearby Digikey would be outrageous!

I used to go here all the time - they had a whole wall of ICs in drawers,
but I think even they're cutting back:
http://www.google.com/local?num=50&hl=en&lr=lang_en&safe=off&q=action-electronics&near=Santa+Ana,+CA&sa=X&oi=localr
(if it wraps in your newsreader, you'll have to reconstitute it in your
address bar)
I guess you could call them - there's a kinda mini-mall of electronics
and computer stuff and surplus, or there was 15 or so years ago.

Good Luck!
Rich