audio recording on IC -help wanted

[Spehro Pefhany]

On Mon, 03 Jan 2005 06:22:49 GMT, the renowned "Martin H. Eastburn"
<oldtree@pacbell.net> wrote:

http://www.3m.com/us/mfg_industrial/indtape/masking/html/prodlit.jhtml
A selector guide of sorts -

Look over the class 1 masking tapes - the 2693 is a good start. There are
several to check - and make price cut based on volume of total world market.
Maybe the 2380 in class II. (Cheaper by class I bet)

Then searching for powercoat :
3M™ Composite Bonding Tape 8905, 10 in x 72 yd, 4 per case
[click to enlarge]

Thanks, Martin, 3M has a much nicer search engine.

That much Kapton tape would probably run $500 or more (50+ 3/4" rolls
minimum order). Polyester should be cheaper.

Clean removing high temperature silicone adhesive and tough
non-slivering polyester backing makes this tape a popular
choice for powder coat paint masking. 6.6 mil (0.17 mm)
total thickness.


3M Id : 70-0063-1697-3 << this one looks like a baking at 350F for 5 hours
and up to 400F...
GTIN(UPC/EAN) : 0 00 21200 55208 3

Don't know the prices - have to check them out.
Martin

I've also had trouble getting smallish quantities of such common 3M
adhesives as 46xMP (basically just a permanent acrylic adhesive with
two backings). Here's the sort of thing..

http://rshughes.com/products/021200_88676.html

You only have to buy one (master) roll, but it's $1500.00. 8-(


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

[Don Taylor]

kurtsutherland@comcast.net writes:

I am looking for a miniature trigger to release a small compression or
torsional spring that as about 1 lbf of force at full compression. The
trigger should fit in a space about 3X3X3mm or less. I have briefly
looked into nitinol wire, voice coils, watch mechanisms, and solenoids,
but haven't found anything small enough.

I am interested in any information that may direct me toward existing
products or classes of actuators/triggers that may be relevant.
Thank you,

Kurt Sutherland

Think of an electrical fuse, without the package containing it.
Your spring is held in the compressed state by a tiny length of
wire. You apply enough power to vaporize the wire and the spring
is released. Running the wire down the center of a coiled spring
seems plausible.

 

[Brian Whatcott]

Fuse wire holding back a spring - very compact, very reliable -
electrically triggered.

Brian W

On 4 Jan 2005 21:00:39 -0800, kurtsutherland@comcast.net wrote:

I am looking for a miniature trigger to release a small compression or
torsional spring that as about 1 lbf of force at full compression. The
trigger should fit in a space about 3X3X3mm or less. I have briefly
looked into nitinol wire, voice coils, watch mechanisms, and solenoids,
but haven't found anything small enough.

I am interested in any information that may direct me toward existing
products or classes of actuators/triggers that may be relevant.
Thank you,

Kurt Sutherland

 

Yes like a crude "explosive bolt" these can release massive loads with
a very tiny device.

Richard

 

[Neil Preston]

Thanks for the ideas, guys.

I had tried the zeners. Didn't do what I needed because the current couldn't
'pulse' to fire the triac being driven. The idea is to monitor the voltage
across a capacitor, and if it rises to a positve or negative value it should
fire the triac. For this I need the diac.

I had also considered the PUT inside a bridge. I was hoping to keep it
simpler than that.

I'll look into the MBS4992.

Happy New Year!

Neil

"Neil Preston" <npreston@nospamgeocities.com> wrote in message
news:3IKAd.7273$iC4.496@newssvr30.news.prodigy.com...

Is there available a DIAC with breakover voltage ratings in the 5-15V
range?
Or an equivalent device?

All I've seen so far are in the 50-60v range.

I wish to make a sensitive triac trigger to detect certain fault
conditions
on an AC signal, and I need the negative resistance characteristics
typical
of a diac, but at much lower threshhold voltage. It must also be
bidirectional.

Thanks,
Neil

 

[Dana M. Hague]

On 4 Jan 2005 21:00:39 -0800, kurtsutherland@comcast.net wrote:

I am looking for a miniature trigger to release a small compression or
torsional spring that as about 1 lbf of force at full compression. The
trigger should fit in a space about 3X3X3mm or less. I have briefly
looked into nitinol wire, voice coils, watch mechanisms, and solenoids,
but haven't found anything small enough.

I had a similar problem a few years ago, had to release a tension
spring inside a small area as part of an assembly machine. I designed
a mechanism similar to a mechanical archery bowstring release. Visit
your local archery or hunting store and take a look at one.

-Dana
--
--
If replying by email, please make the obvious changes.
-------------------------------------------------------------------------------Press any key... no, no, no, NOT THAT ONE!

 

[John Nagle]

CWatters wrote:

kurtsutherland@comcast.net> wrote in message
news:1104901239.606342.111930@z14g2000cwz.googlegroups.com...

I am looking for a miniature trigger to release a small compression or
torsional spring that as about 1 lbf of force at full compression.

One of the more elegant solutions is to use something
made from a "memory metal" alloy. When you run a current
through it, it deforms, and when it cools, it goes back
to normal.

See

http://www.robotstore.com/catalog/display.asp?pid=2

Shape-memory alloys have been a solution looking for
a problem for decades. Minature electrically-released
latches are one of the few good applications.

Back in the 1980s, someone at Stanford built a Frisbee
which could be shot down with a laser tag gun.
It used a shape-memory alloy latch to hold down
a fin. When a laser beam hit the sensor, current
flowed through the latch, which deformed and
released the fin. The fin acted as a speed brake
and caused the Frisbee to crash. Neat idea,
too expensive back then.

John Nagle

 

[Mark Fergerson]

Neil Preston wrote:

Is there available a DIAC with breakover voltage ratings in the 5-15V range?
Or an equivalent device?

All I've seen so far are in the 50-60v range.

I wish to make a sensitive triac trigger to detect certain fault conditions
on an AC signal, and I need the negative resistance characteristics typical
of a diac, but at much lower threshhold voltage. It must also be
bidirectional.

Have you Googled for "lambda diode"?

Mark L. Fergerson

 

[JeffM]

DIAC with breakover voltage ratings in the 5-15V range?
Neil Preston

Have you Googled for "lambda diode"?
Mark L. Fergerson

An image seach cleared out the crud.
http://images.google.com/images?q=lambda-diode

 

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[Neil Preston]

That was exactly the piece of information I needed. I'm a Crown authorized
servicer, and believe it or not, I have 3 in stock. They are marked with a
different number, and are not identified by part number on the parts list,
but the schematic labels them as an MBS4993, with an 8v breakover rating.
It's perfect!

Thanks Much!

Neil

"Mike Diack" <moby@kcbbs.gen.middleearth> wrote in message
news:Xns95D6545387C03mobykcbbsgennz@203.96.92.12...

A bit of quick googling shows that the brokers (touts and shysters) are
sitting on mountains of them, but the regular supply lines are indeed
dry. I'm sort of amazed that these useful little widgets have gone on
the endangered species list. On semi still list them and Crown Audio are
still using them (in their CE series pro amps) so they gotta be out
there. Otherwise you could get creative with a bridge wrapped around a
little SCR (5060) and a couple of resistors. <sigh
M


"Neil Preston" <npreston@nospamgeocities.com> wrote in
news:%BVCd.7280$F67.6246@newssvr12.news.prodigy.com:

The MBS4992 looks like it would be perfect for my app. Unfortunately,
it appears to be no longer manufactured. Any suggestions for sources?
(10-15 pcs.)


Neil

"Mike Diack" <moby@kcbbs.gen.middleearth> wrote in message
news:Xns95CFDD8011E90mobykcbbsgennz@203.96.92.12...
"Neil Preston" <npreston@nospamgeocities.com> wrote in
news:3IKAd.7273$iC4.496@newssvr30.news.prodigy.com:

Is there available a DIAC with breakover voltage ratings in the
5-15V range? Or an equivalent device?

All I've seen so far are in the 50-60v range.

I wish to make a sensitive triac trigger to detect certain fault
conditions on an AC signal, and I need the negative resistance
characteristics typical of a diac, but at much lower threshhold
voltage. It must also be bidirectional.

Thanks,
Neil



How about an MBS4992 (Motorola) ?
M

 

[Neil Preston]

Thanks, guys.... interesting item.

I knew that an e-b junction would zener at about 6V, but hadn't thought
about the breakover characteristic E-C.

Neil

"Mark Fergerson" <nunya@biz.ness> wrote in message
news:EUdDd.51938$Cl3.27551@fed1read03...

Neil Preston wrote:

Is there available a DIAC with breakover voltage ratings in the 5-15V
range?
Or an equivalent device?

All I've seen so far are in the 50-60v range.

I wish to make a sensitive triac trigger to detect certain fault
conditions
on an AC signal, and I need the negative resistance characteristics
typical
of a diac, but at much lower threshhold voltage. It must also be
bidirectional.

Have you Googled for "lambda diode"?

Mark L. Fergerson

 

[Spehro Pefhany]

On Sat, 08 Jan 2005 09:16:02 GMT, the renowned Tim Hubberstey
<bogus@bogusname.com> wrote:

elehman1@columbus.rr.com wrote:
I am working on a circuit that calls for a MM5837N noise generating IC chip.
This is an obselete chip and I need to find a chip that can take its place.

Any help in locating an alternate chip would be great.

This chip is nothing more than a 17-bit LFSR with an internal oscillator
running at somewhere between 55 and 120 kHz. This is easily replicated
with almost any of the small CPLDs available (you'd need an external
clock). You could probably also program it into one of the 8-pin PIC
devices if you need to keep the same size footprint.

You can get a data sheet here:
http://www.alldatasheet.com/datasheet-pdf/pdf/NSC/MM5837N.html

Really high voltage, that chip. A 5-V only device with similar specs
could be easily produced with an 8-pin PIC.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

I am somewhat sceptical about the more paranormal explanations - just

One day, I want to make a TV series based on some pseudoscientific
principle. I want to have a 15-second introduction in which I state
explicitly:

There is no such thing as [buzzword].
We invented it for this TV show.
Now it's on TV, crackpots will appear claiming that it's a real
phenomenon.
Please remember that they're crackpots.
Of course this won't stop the crackpots.

 

[Watson A.Name - \"Watt Su]

"Neil Preston" <npreston@nospamgeocities.com> wrote in message
news:gIUCd.12488$iC4.4221@newssvr30.news.prodigy.com...

Thanks for the ideas, guys.

I had tried the zeners. Didn't do what I needed because the current
couldn't
'pulse' to fire the triac being driven. The idea is to monitor the
voltage
across a capacitor, and if it rises to a positve or negative value it
should
fire the triac. For this I need the diac.

I had also considered the PUT inside a bridge. I was hoping to keep it
simpler than that.

I'll look into the MBS4992.

I was surfing the other day and came across some info on four-layer
devices, and it sounds like this is what you're looking for. They are
lower voltage than DIACs.

http://www.play-hookey.com/semiconductors/4-layer.html

Happy New Year!

Neil

"Neil Preston" <npreston@nospamgeocities.com> wrote in message
news:3IKAd.7273$iC4.496@newssvr30.news.prodigy.com...
Is there available a DIAC with breakover voltage ratings in the
5-15V
range?
Or an equivalent device?

All I've seen so far are in the 50-60v range.

I wish to make a sensitive triac trigger to detect certain fault
conditions
on an AC signal, and I need the negative resistance characteristics
typical
of a diac, but at much lower threshhold voltage. It must also be
bidirectional.

Thanks,
Neil

 

[ScottL]

Whoa! I thought that if it was on TV it HAD TO BE TRUE!
Say it 'aint so.

-ScottL

 

[Dmitri(Cabling-Design.com]

Tim Wescott wrote:

I've seen serial breakouts, with DB-9 connectors. Does anybody make a
breakout box with modular connectors? I'm about to make my own, but
it'd be nice to know.

Thanks.

There is no standard pinout for RS232 on 8P8C connectors, so it is
unlikely someone will produce such box. You can still get (proprietary)
adapters for the DB-9 or DB-25 to 8P8C, which, combines with a "regular"
breakout box, will get you what you are looking for. Check Internet for
AT&T 355 adapter or equivalents. Or simply get a customizable adapter and
invent your own pinout. Just make sure it's the same (or cross-over if you
need it) on both ends.


--
Dmitri Abaimov, RCDD
http://www.cabling-design.com
Cabling Forum, color codes, pinouts and other useful resources for
premises cabling users and pros
http://www.cabling-design.com/homecabling
Residential Cabling Guide
-------------------------------------



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[Dave Platt]

In article <aYDEd.529787$lR6.85263@news.easynews.com>,
Dmitri(Cabling-Design.com) <info_at_cabling-design_dot_com@foo.com> wrote:

I've seen serial breakouts, with DB-9 connectors. Does anybody make a
breakout box with modular connectors? I'm about to make my own, but
it'd be nice to know.

Thanks.

There is no standard pinout for RS232 on 8P8C connectors, so it is
unlikely someone will produce such box.

Well, it appears that there are actually _two_ fairly popular
standards. EIA/TIA 561 is one, and the ""Yost Serial Device Wiring
Standard" is often found on Unix systems. The two are, alas, quite
incompatible.

You can still get (proprietary)
adapters for the DB-9 or DB-25 to 8P8C, which, combines with a "regular"
breakout box, will get you what you are looking for. Check Internet for
AT&T 355 adapter or equivalents. Or simply get a customizable adapter and
invent your own pinout. Just make sure it's the same (or cross-over if you
need it) on both ends.

One advantage of the Yost standard is that it presents the same
data-in and data-out positions on the RJ45 for all devices... the
differences between DCE and DTE are taken care of in the DB-whatever-to-
RJ45 connector. With Yost, you can connect any device to any other
with the same cable.

I agree, the O.P. will very probably have to build a breakout box with
whatever RJ45 pinout is desired.

--
Dave Platt <dplatt@radagast.org> AE6EO
Hosting the 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!

 

[Watson A.Name - \"Watt Su]

"Rich Grise" <richgrise@example.net> wrote in message
newsan.2005.01.11.23.26.06.926872@example.net...

On Mon, 10 Jan 2005 16:07:40 -0800, Tim Wescott wrote:

Tim Wescott wrote:

I've seen serial breakouts, with DB-9 connectors. Does anybody
make a
breakout box with modular connectors? I'm about to make my own,
but
it'd be nice to know.

Thanks.

I seem to not have been clear.

I'm working on a telephony application, and I want to dink with tip
and
ring. I want a break out box that's just like serial break out
boxes,
only it uses modular connectors -- AKA "telephone" connectors, AKA
RJ-45.


By the time you're done with the thread, you could have build one
already.

Just a couple of PCB-mount connectors, and a piece of stripboard,
maybe a
couple rows of pin headers or turret terminal TPs. Or even a DIP
socket. ;-)

Have Fun!
Rich

No, no, no! Real Telephone Techs don't use pin headers, etc. Real
Telephone Techs use a 66 block to do their 'patching'. That and a hank
of telephone wire is all any real telephone tech ever needed. You can
get a 66 block with RJ-45 connectors on the side. But the RJ-45 is not
a telephone connector, it's for T1 or modems or ISDN. You only need two
wires for tip and ring, not eight wires! What you really need is a 6
position, 2, 4, or 6 conductor jack and plug, commonly known as RJ-11 or
RJ-14 or RJ-25.

 

[Watson A.Name - \"Watt Su]

"Tim Wescott" <tim@wescottnospamdesign.com> wrote in message
news:10u8t5sg5m2t407@corp.supernews.com...

Rich Grise wrote:

On Mon, 10 Jan 2005 16:07:40 -0800, Tim Wescott wrote:


Tim Wescott wrote:


I've seen serial breakouts, with DB-9 connectors. Does anybody
make a
breakout box with modular connectors? I'm about to make my own,
but
it'd be nice to know.

Thanks.


I seem to not have been clear.

I'm working on a telephony application, and I want to dink with tip
and
ring. I want a break out box that's just like serial break out
boxes,
only it uses modular connectors -- AKA "telephone" connectors, AKA
RJ-45.



By the time you're done with the thread, you could have build one
already.

Just a couple of PCB-mount connectors, and a piece of stripboard,
maybe a
couple rows of pin headers or turret terminal TPs. Or even a DIP
socket. ;-)

Have Fun!
Rich


Or even some clip leads and some sockets from Rat Shack (which is what
I
did).

--

Tim Wescott

Ah-HAH! You made a 'Beige Box!" (Look up Phreaking for more info.)