audio recording on IC -help wanted

[Joerg]

John Larkin wrote:

On Fri, 31 Oct 2008 10:19:56 -0700, Joerg
notthisjoergsch@removethispacbell.net> wrote:

Spehro Pefhany wrote:
On Thu, 30 Oct 2008 17:36:27 -0700, the renowned Joerg
notthisjoergsch@removethispacbell.net> wrote:

Hello,

Just curious, although I am not holding my breath that any exist:

Are there FETs with a Vds rating of 300V or higher, preferably DPAK
(TO-252), that have a guaranteed Rdson of around 1ohm or less at Vgs of
6V or less? 1A current or higher.

With guaranteed I mean not in some graph but with an entry under "max"
in the tables. The usual ones are only rated at 10V although the figures
indicate that they could have rated them for lower gate drive voltages
at lesser current. But the manufacturers chose not to and trying to get
any endorsement to that effect is like kicking a big oak tree.

The motivation is the usual. Logic drive, the typical MIC4422 or similar
is too much money plus it would need its personal supply voltage which
would have to be made.
Have not noticed any (though there are a few 200V small MOSFETs rated
for logic-level drive, but higher Rds(on) and lower current rating
than you want.

OTOH, you'll have thousands of inexpensive jellybean choices if you
make it 10V drive.

Yeah, which is what we'll do. I was just hoping. 10V drive will add a
lot of stuff and we are really cramped for space on this one.

Does the drive need to be truly DC-coupled? You could maybe do some
cute stuff if the fet doesn't have to be on for a long time.

I could but then the transformed-up Cgs would hit us from behind. Looks
like we might have to provide a clean and staunch 10V.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

 

[Fred Bloggs]

legg wrote:

On Thu, 28 Feb 2008 16:09:22 -0500, Fred Bloggs <nospam@nospam.com
wrote:



legg wrote:

On Thu, 28 Feb 2008 12:51:29 -0500, Fred Bloggs <nospam@nospam.com
wrote:




Placing impedance in series with the working solenoid could produce a
reduction in speed/dropout performance in the armature of the relay
switching the main working load. (not shown in the above drawing)

I'm not sure how you modelled the relay coil, but if it used a linear
inductor, it will not likely reflect actual performance. A relay
drive coil is coupled to a mechanically changing magnetic circuit.

As the OP already has a cost-free solution involving programmed timing
adjustments, perhaps it's best to let the issue drop?

RL


He was working with a largely resistive 8KR coil, the 100R has no effect
on pull-in or hold-in. The programmed timing can be dropped, what
happens at line loss, does his controller lock up because things didn't
go exactly as planned, you tell me.


I've asked for this information, but still see only the reference to a
6W AC coil in the relay doing the work. Larger AC working relay coil
current is seldom determined by the DC impedance of the coil. You can
refer to the Leach tutorial on this issue, and their catalog, though
they don't seem to supply relays or contactors with low frequency AC
coils, at present.

For example, a 115V 400Hz coil in a 4W series, is listed as consuming
90mA. This indicates that the DC resistance of the coil must be less
than half an RDC value that would produce the specified current, in
order to keep combined power loss from coil and armature poles to the
value expected.

The losses in AC activated coils is typically 5 times that for DC
rated ones, in simpler commodity forms like OMRON MGN.

http://components.omron.com/components/web/webfiles.nsf$FILES/family.html?ID=CNEN-6TJQPU

But that wasn't always the case.

Older SquareD parts anticipate coil current ratios of more tha 4:1
between closed and open armature, with different values expected for
50 and 60Hz dedicated parts..

http://ecatalog.squared.com/catalog/173/html/sections/21/17321026.html#1013844

The same relationship shows up in lower-powered parts:

http://catalog.tycoelectronics.com/TE/bin/TE.Connect?S=21426&M=FEAT&P=86596,80517&U=&BML=10576,16354,16453&LG=1

RL

I'm aware of that. Generally AC coils with predominantly reactive
impedance are rated in VA and the so-called impedance limited coils with
impedance dominated by coil wire resistance are rated in Watts. The OP
is working with a 6W impedance limited coil.


Sorry, but I don't see a resistance limited coil described in any
correspondence from the OP.

The most common ( old P&B now Tyco ) contactor for high current that
still offers AC coils and a fair description of their impedance and
wattage expectations:

http://tinyurl.com/3845jx

RL

That link proves my point, the AC coils are specified in Volt-Amps and
the listed DC resistance of those coils is ~20% of the reactance. The
fact that the OP describes his coil as AC and 6W means it's impedance
limited.

 

[Joerg]

Hello Folks,

What would be a really low noise FET? Should be well under 10nV/rtHz at
the lower end of the audio band, say at 20Hz. Ideally 5nv/rtHz. Looked
at former Matsushita parts, now Panasonic:

2SK3426: Supposedly good but no specs to wrote home about.
2SK2593: Says 2.5dB NF at 100Hz but as usual no graphs.
2SK2751: Could be the best, claims low noise but _no_ noise spec at all!

To say it mildly specsmanship isn't exactly what it used to be and my
experience in obtaining additional info from Asian companies is, well, a
bit mixed.

--
Regards, Joerg

http://www.analogconsultants.com/

 

[MooseFET]

"Jim Thompson" <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote in
message news:bcres3ps8e5p310h1vbscrlr5f3hhlfeh3@4ax.com...

On Thu, 28 Feb 2008 18:14:54 -0800, "Joel Koltner"
zapwireDASHgroups@yahoo.com> wrote:

Hi Joerg,

"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:QlJxj.3261$pl4.18@newssvr22.news.prodigy.net...
But don't you guys use OrCad? I used to, but not anymore.

Yeah, for production stuff we do. I definitely don't *like* that fact,
but
we're in the (not so uncommon) situation that we have a number of ORCAD
licenses that were purchased years ago so switching requires...

1) Outlay of "new purchase price" for the alternative rather than just
shelling out maintenance every year
2) Conversion of current library parts over to new system
3) Re-training of engineers & techs to use the new system

ORCAD is spendy enough that #1 isn't too big of a problem, and our
libraries
still only have hundreds (not thousands) of symbols in them so changeover
there isn't too bad (I wouldn't imagine it'd be more than a month's
effort),
but #3 is difficult to get by some people since they're so used to ORCAD,
they
don't really see its shortcomings, and they're not personally footing the
bill
for it. (I think there's often a "bell curve of happiness" associated
with
mediocre software... new users have problems with everything, regular but
undemanding users are happy because they don't stress the tool much so it
works OK, whereas advanced/demanding users are unhappy again because they
realize that there are so many better options out there).

Sometime this year I'm planning on making a proper (formal) presentation
comparing ORCAD with, e.g., Pulsonix. We'll see what happens...

Heck, is Autotrax still around? That used to be pretty good and I bet it
won't be expensive anymore.

Autotrax or AutoTRAX? Wikipedia discusses two of them:
http://en.wikipedia.org/wiki/AutoTRAX_EDA

---Joel

P.S. -- Vaguely related story about software quality: I have a friend who
works for a Big Software Company. In general he says that their most
sophisticated users and bug reports come from Europe. They had one guy in
the
U.K. who was constantly filling bug reports with them -- it was almost
uncanny
how "good" he was at discovering them. At some point it dawned on them
that... hey... this would be a very useful guy to hire! They offered, he
accepted, and now he's working here in Oregon. It turns out this fellow
has
been using the software package in question for longer than anyone who's
currently on staff at the company (!), and he has an excellent memory,
being
able to provide in-depth comparisons and contrasts of the package and
what's
been changed and fixed/broken in it for the past decade. Amazing...


Sometimes that works, sometimes it doesn't.

I literally buried the PSpice support people in accurate bug
reports/"issues".

They thanked me profusely and did nothing.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

Are you NI(national instrument) software went on sales lately? That's an
indication that you dumass going down... Heehee......Halleluiah. Shame on
you arrogant people.

 

[MooseFET]

"Jim Thompson" <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote in
message news:bcres3ps8e5p310h1vbscrlr5f3hhlfeh3@4ax.com...

On Thu, 28 Feb 2008 18:14:54 -0800, "Joel Koltner"
zapwireDASHgroups@yahoo.com> wrote:

Hi Joerg,

"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:QlJxj.3261$pl4.18@newssvr22.news.prodigy.net...
But don't you guys use OrCad? I used to, but not anymore.

Yeah, for production stuff we do. I definitely don't *like* that fact,
but
we're in the (not so uncommon) situation that we have a number of ORCAD
licenses that were purchased years ago so switching requires...

1) Outlay of "new purchase price" for the alternative rather than just
shelling out maintenance every year
2) Conversion of current library parts over to new system
3) Re-training of engineers & techs to use the new system

ORCAD is spendy enough that #1 isn't too big of a problem, and our
libraries
still only have hundreds (not thousands) of symbols in them so changeover
there isn't too bad (I wouldn't imagine it'd be more than a month's
effort),
but #3 is difficult to get by some people since they're so used to ORCAD,
they
don't really see its shortcomings, and they're not personally footing the
bill
for it. (I think there's often a "bell curve of happiness" associated
with
mediocre software... new users have problems with everything, regular but
undemanding users are happy because they don't stress the tool much so it
works OK, whereas advanced/demanding users are unhappy again because they
realize that there are so many better options out there).

Sometime this year I'm planning on making a proper (formal) presentation
comparing ORCAD with, e.g., Pulsonix. We'll see what happens...

Heck, is Autotrax still around? That used to be pretty good and I bet it
won't be expensive anymore.

Autotrax or AutoTRAX? Wikipedia discusses two of them:
http://en.wikipedia.org/wiki/AutoTRAX_EDA

---Joel

P.S. -- Vaguely related story about software quality: I have a friend who
works for a Big Software Company. In general he says that their most
sophisticated users and bug reports come from Europe. They had one guy in
the
U.K. who was constantly filling bug reports with them -- it was almost
uncanny
how "good" he was at discovering them. At some point it dawned on them
that... hey... this would be a very useful guy to hire! They offered, he
accepted, and now he's working here in Oregon. It turns out this fellow
has
been using the software package in question for longer than anyone who's
currently on staff at the company (!), and he has an excellent memory,
being
able to provide in-depth comparisons and contrasts of the package and
what's
been changed and fixed/broken in it for the past decade. Amazing...


Sometimes that works, sometimes it doesn't.

I literally buried the PSpice support people in accurate bug
reports/"issues".

They thanked me profusely and did nothing.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Rat Brass |
| http://www.analog-innovations.com | 1962 |

America: Land of the Freedom abuser, Because of the Bastards

Are you aware NI(national instrument) software went on sales lately? That's
an
indication that you dumass going down... Heehee......Halleluiah. Shame on
you arrogant people.

 

[MR COFFEE]

Hi folks.
I am trying to put together Bill Bowden's thermostat circuit to
trigger back-to-back SCRs to turn on a water heater element run on
120v (to make a 500 watt heater).

I don't have a 3 winding trigger transformer laying around, but I do
have a nice toroid core I picked up surplus that is supposedly for
pulse transformer use. Can I just wind a trifilar winding around it
with some 28AWG magnet wire and have half a chance it will work? The
core measures about 2 uh with 8 turns on it, so I figure it is a
pretty low mu ferrite core.

TIA.

mr coffee

 

[Fred Bloggs]

I need to display the numbers 0-255 in decimal on a 3-digit LED
display for a microcontroller project (it would need to be visible in
the dark). Ideally the display would be inexpensive and not take up
too many uC outputs, but what I am finding is expensive ($30 or more).
Does anyone make an inexpensive 3-digit 7-segment LED module that
accepts serial input from say, a PICAXE or a BASIC Stamp 2? Also I
haven't done anything using serial i/o yet but I saw some displays
that had a "clock" pin (so the controller can sync up the data stream
with the module). Would I need to get a clock module for the basic
stamp to talk to the display module? What would a good one be? Can you
build a reliable clock for less using a 555 timer? I as thinking about
how such a device might work without a clock and thought of a way to
do it with 2 lines output, 0-0 would mean no data, 0-1 would mean here
comes some data, 1-0 would mean low, 1-1 would mean high. The display
module would consist of a microcontroller with 2 inputs and 12 outputs
(3 groups of 4 outputs going to a 7-segment encoder IC to drive each
digit). Is this a decent solution or unnecessary? Any advice or links
to a good example would be appreciated... Thanks.

You can adapt this to three digits, it was intended to be driven by an
8-bit PIC port, is cheap and fast, and uses parts readily available from
Mouser or Digikey:
View in a fixed-width font such as Courier.


..
..
..
..
.. RA7=0 ;used to enable write without address error
..
.. FOR DIGIT=1 TO 7
..
.. RA4-RA6= DIGIT-1
..
.. FOR SEGMENT=1 TO 7
..
.. RA1-RA3= SEGMENT-1
..
.. RA0= SEGMENT ON/OFF (1/0)
..
.. OUTPUT RA0-RA7
..
.. RA7=1
..
.. OUTPUT RA0-RA7
..
.. RA7=0
..
.. OUTPUT RA0-RA7
..
.. NEXT SEGMENT
..
.. NEXT DIGIT
..
..
..
..
..
..
..
.. a
.. LED DRIVER ---
.. --------------- 7 f| g |b
.. wherever-----|CLR O1a-O1g|----/---- --- DIGIT1
.. | | e| d |c
.. | | ---
.. RA0-----------------|D | ---
.. | | 7 | |
.. s | O2a-O2g|----/---- --- DIGIT2
.. e RA1-----------------|A0 | | |
.. g | | ---
.. m RA2-----------------|A1 | ---
.. e | | 7 | |
.. n RA3-----------------|A2 O3a-O3g|----/---- --- DIGIT3
.. t ------ | | | |
.. | __| |__ | ---
.. d RA4 -----|S0 O1|---|G1 | ---
.. i | __| |__ | 7 | |
.. g RA5------|S1 O2|---|G2 O4a-O4g|----/---- --- DIGIT4
.. i | __| |__ | | |
.. t RA6------|S2 O3|---|G3 | ---
.. | __| |__ | ---
.. | O4|---|G4 | 7 | |
.. RA7------|G __| |__ O5a-O5g|----/---- --- DIGIT5
.. | O5|---|G5 | | |
.. |__ __| |__ | ---
.. .--|G1 O6|---|G6 | ---
.. | |__ __| |__ | 7 | |
.. +--|G2 O7|---|G7 O6a-O6g|----/---- --- DIGIT6
.. | ------ | | | |
.. --- 74HC138 | | ---
.. gnd digit | | ---
.. select | | 7 | |
.. | O7a-O7g| ---/---- --- DIGIT7
.. --------------- | |
.. ---
..
..
..
.. O1a-O1g O7a-O7g
.. LED DRIVER | |
.. .-------------------------------------------------------
.. | U1 | U7 | |
.. | TPIC6B259 | TPIC6B259 | |
.. | ------- | 7x TPIC6B259 ------- | |
.. D |-> -|D O1a|/| -|D O7a|/| |
.. | | | | o o o | | | |
.. | |__ O1b|/| |__ O7b|/| |
.. | .-----|G1 | | .-----|G7 | | |
.. | | | O1c|/| | | O7c|/| |
.. --- | | |___ | | | |___ | | |
.. CLR |-> | -|CLR O1d|/| | -|CLR O7d|/| |
.. | | | | | | | | | |
.. | | | O1e|/| | | O7e|/| |
.. A0|-> | -|A0 | | | -|A0 | | |
.. | | | O1f|/| | | O7f|/| |
.. A1|-> | -|A1 | | | -|A1 | | |
.. | | | O1g|/ | | O7g|/ |
.. A2|-> | -|A2 | | -|A2 | |
.. | | | O18|-NC | | O78|-NC |
.. | | ------- | ------- |
.. __| | DIGIT1 DRIVE | DIGIT7 DRIVE |
.. G1|------' 7-segments | 7-segments |
.. __| a-g | a-g |
.. G2|------> | |
.. __| | |
.. G3|----------> | A2 A1 A0 seg |
.. __| | 0 0 0 a |
.. G4|------------> | 0 0 1 b |
.. __| | 0 1 0 c |
.. G5|--------------> | 0 1 1 d |
.. __| | 1 0 0 e |
.. G6|-----------------> | 1 0 1 f |
.. __| | 1 1 0 g |
.. G7|----------------------------------' |
.. -------------------------------------------------------
..

 

[Pieter]

On Mon, 25 Feb 2008 20:27:15 -0800 (PST), shankargundigi@gmail.com
wrote:

please send the new version of software

Whats wrong with the old version?

P.

 

[Vladimir Vassilevsky]

lvwener@gmail.com wrote:

Hello, I am now looking for an Operation Amplifer chip able to be a
voltage follower, which I need to use as a buffer between my sensor
circuit and the digitizer. Can anybody help me?

Since the output impedance of my sensor circuit is about 0.2 Gohm, the
follower needs to have a input impedance much higher than that (Maybe
a JFET one could work).

The input signal is always sinusoidal, with an amplitude = 1~2V, and a
variable frequency = 10KHz~1MHz, and the noise at the output is
required to be <1uV.

Your requirements do not make any sense. Change it to something more
realistic.

0.2GOhm @ 1MHz = ~ 8e-4 pF. Not feasible.

1uV @ 1MHz = ~ 1nV/sqrt(Hz). Not feasible.

1uV @ 1Mhz @ 0.2GOhm =~ 5e-3fA/sqrt(Hz). Not feasible.

0.2GOhm @ 300K @ 1MHz = ~1.8mV of thermal noise already.

I tried AD712, but its bandwidth seems not enough for the 1MHz signal.
And the AD746 showed a terrible self-excitation as being used as a
follower.

I suggest OPA2350. But your requirements just can't be met by any
technology.


Vladimir Vassilevsky

DSP and Mixed Signal Design Consultant

http://www.abvolt.com

 

[GPE]

Blah, blah, blah...

Has anybody else noticed that all these Chinese spammers have emails that
look nearly identical? Product, company name and email changes but the
format always looks the same.
Same spammers?

Also, if they are from China - why do they all have western sounding names.
Sabrina, Jason, etc. Don't they feel secure enough to use their real names?

-- Ed

<Yasmina-tang@hotmail.com> wrote in message
news:1190949055.387632.101650@k79g2000hse.googlegroups.com...

Dear All,

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[John McGaw]

kony wrote:

On Sun, 24 Jun 2007 14:02:23 -0700, speedclub911@gmail.com
wrote:

Reviews of latest hardware, graphic cards, processors, motherboards,
hdd, memory...
Build your dream machine, check latest prices.

http://spam.com/


If you persist in spamming, expect to have your blogs
removed and ISP account terminated.

Probably easier said than done. Blogspot = Google Groups = Gmail =
Google = the ultimate refuge for spamming a**holes around the world.
They don't react to anything their "clients" do, no matter how outrageous.

--
John McGaw
[Knoxville, TN, USA]
http://johnmcgaw.com

 

[MooseFET]

On Feb 29, 1:06 am, "MooseFET" <kensm...@rahul.net> wrote:

"Jim Thompson" <To-Email-Use-The-Envelope-I...@My-Web-Site.com> wrote in
messagenews:bcres3ps8e5p310h1vbscrlr5f3hhlfeh3@4ax.com...



On Thu, 28 Feb 2008 18:14:54 -0800, "Joel Koltner"
zapwireDASHgro...@yahoo.com> wrote:

Hi Joerg,

"Joerg" <notthisjoerg...@removethispacbell.net> wrote in message
news:QlJxj.3261$pl4.18@newssvr22.news.prodigy.net...
But don't you guys use OrCad? I used to, but not anymore.

Yeah, for production stuff we do. I definitely don't *like* that fact,
but
we're in the (not so uncommon) situation that we have a number of ORCAD
licenses that were purchased years ago so switching requires...

1) Outlay of "new purchase price" for the alternative rather than just
shelling out maintenance every year
2) Conversion of current library parts over to new system
3) Re-training of engineers & techs to use the new system

ORCAD is spendy enough that #1 isn't too big of a problem, and our
libraries
still only have hundreds (not thousands) of symbols in them so changeover
there isn't too bad (I wouldn't imagine it'd be more than a month's
effort),
but #3 is difficult to get by some people since they're so used to ORCAD,
they
don't really see its shortcomings, and they're not personally footing the
bill
for it. (I think there's often a "bell curve of happiness" associated
with
mediocre software... new users have problems with everything, regular but
undemanding users are happy because they don't stress the tool much so it
works OK, whereas advanced/demanding users are unhappy again because they
realize that there are so many better options out there).

Sometime this year I'm planning on making a proper (formal) presentation
comparing ORCAD with, e.g., Pulsonix. We'll see what happens...

Heck, is Autotrax still around? That used to be pretty good and I bet it
won't be expensive anymore.

Autotrax or AutoTRAX? Wikipedia discusses two of them:
http://en.wikipedia.org/wiki/AutoTRAX_EDA

---Joel

P.S. -- Vaguely related story about software quality: I have a friend who
works for a Big Software Company. In general he says that their most
sophisticated users and bug reports come from Europe. They had one guy in
the
U.K. who was constantly filling bug reports with them -- it was almost
uncanny
how "good" he was at discovering them. At some point it dawned on them
that... hey... this would be a very useful guy to hire! They offered, he
accepted, and now he's working here in Oregon. It turns out this fellow
has
been using the software package in question for longer than anyone who's
currently on staff at the company (!), and he has an excellent memory,
being
able to provide in-depth comparisons and contrasts of the package and
what's
been changed and fixed/broken in it for the past decade. Amazing...

Sometimes that works, sometimes it doesn't.

I literally buried the PSpice support people in accurate bug
reports/"issues".

They thanked me profusely and did nothing.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Rat Brass |
| http://www.analog-innovations.com | 1962 |

America: Land of the Freedom abuser, Because of the Bastards

Are you aware NI(national instrument) software went on sales lately? That's
an
indication that you dumass going down... Heehee......Halleluiah. Shame on
you arrogant people.

Yup 13 years old.

 

[Jamie]

mc wrote:

What are people's favorite low-dropout linear regulators? ("Jellybean" in
the sense of The Art of Electronics -- the ones you want to keep on hand in
some quantity.)


there are so many out there, It's hard to say..

for example.
go to mouser.com and do a search there for

"LDO"


--
"I'd rather have a bottle in front of me than a frontal lobotomy"
http://webpages.charter.net/jamie_5

 

[legg]

On Fri, 29 Feb 2008 03:43:59 -0500, Fred Bloggs <nospam@nospam.com>
wrote:

I'm aware of that. Generally AC coils with predominantly reactive
impedance are rated in VA and the so-called impedance limited coils with
impedance dominated by coil wire resistance are rated in Watts. The OP
is working with a 6W impedance limited coil.


Sorry, but I don't see a resistance limited coil described in any
correspondence from the OP.

The most common ( old P&B now Tyco ) contactor for high current that
still offers AC coils and a fair description of their impedance and
wattage expectations:

http://tinyurl.com/3845jx

RL

That link proves my point, the AC coils are specified in Volt-Amps and
the listed DC resistance of those coils is ~20% of the reactance. The
fact that the OP describes his coil as AC and 6W means it's impedance
limited.

Could you post a link to a data sheet for any device meeting this
description? I am unable to find a relay in this coil power range that
even has an AC-operated rating specified in W, never mind one
operating at this power level resistively.

I see some smaller ones that come close to 45 degrees, but are still
on the inductive side. I guess it's hard to avoid, being a magnetic
component.

I appreciate that there's some confusion here, but I have a suspicion
that it is most likely to originate with poor characterization by the
OP. I see no reason to carve the misunderstanding into electronic
stone on the news server.

RL

 

On Sep 23, 9:14 am, Eeyore <rabbitsfriendsandrelati...@hotmail.com>
wrote:

Rich Grise wrote:
Eeyore wrote:
a7yvm109gf...@netzero.com wrote:
Eeyore wrote:
Now, only a little while back I said I never breadboard, I go straight
to pcb.

This one's different though. The client wants to do the layout as part
of a larger scheme and I want to be double sure of stability in
practice as opposed to simulation because if he messes up, I can show
mine working fine.

As I'll be using a 65MHz ? op-amp I don't trust perfboard / Veroboard
for this.

I recall some self adhesive 'pre-etched shapes' that you could stick
on a ground plane. The name Wainwright comes to mind but google isn't
helping much.

Any suggestions ?

surfboards?
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=9161...

Not terribly convenient for the UK sadly. That's the sort of thing but you
could get individual IC package 'stick ons' and strips for
interconnections etc.

How about pad-per-hole perfboard (preferably with ground plane on the
other side) and either fine wire or copper tape?

Never seen one with ground plane on one side.

Farnell used to stock a prototyping board with a "collander ground
plane" on one side.

C.I.F. stills seems to make something like this

http://www.cif.fr/new/produits_aff.php3?cat=1&scat=1&sscat=3&p=169

as the AL 201 at the bottom of the list.

Farenell stocks it under order code 1201481. I'm fairly sure that this
isn't the part I used but it does seem to be the same kind of
prototyping board.

--
Bill Sloman, Nijmegen

 

[MooseFET]

"MooseFET" <kensmith@rahul.net> wrote in message
news:0fb45428-ca20-42f1-9f20-333e924803c7@s37g2000prg.googlegroups.com...

On Feb 29, 1:06 am, "MooseFET" <kensm...@rahul.net> wrote:
"Jim Thompson" <To-Email-Use-The-Envelope-I...@My-Web-Site.com> wrote in
messagenews:bcres3ps8e5p310h1vbscrlr5f3hhlfeh3@4ax.com...



On Thu, 28 Feb 2008 18:14:54 -0800, "Joel Koltner"
zapwireDASHgro...@yahoo.com> wrote:

Hi Joerg,

"Joerg" <notthisjoerg...@removethispacbell.net> wrote in message
news:QlJxj.3261$pl4.18@newssvr22.news.prodigy.net...
But don't you guys use OrCad? I used to, but not anymore.

Yeah, for production stuff we do. I definitely don't *like* that fact,
but
we're in the (not so uncommon) situation that we have a number of ORCAD
licenses that were purchased years ago so switching requires...

1) Outlay of "new purchase price" for the alternative rather than just
shelling out maintenance every year
2) Conversion of current library parts over to new system
3) Re-training of engineers & techs to use the new system

ORCAD is spendy enough that #1 isn't too big of a problem, and our
libraries
still only have hundreds (not thousands) of symbols in them so
changeover
there isn't too bad (I wouldn't imagine it'd be more than a month's
effort),
but #3 is difficult to get by some people since they're so used to
ORCAD,
they
don't really see its shortcomings, and they're not personally footing
the
bill
for it. (I think there's often a "bell curve of happiness" associated
with
mediocre software... new users have problems with everything, regular
but
undemanding users are happy because they don't stress the tool much so
it
works OK, whereas advanced/demanding users are unhappy again because
they
realize that there are so many better options out there).

Sometime this year I'm planning on making a proper (formal)
presentation
comparing ORCAD with, e.g., Pulsonix. We'll see what happens...

Heck, is Autotrax still around? That used to be pretty good and I bet
it
won't be expensive anymore.

Autotrax or AutoTRAX? Wikipedia discusses two of them:
http://en.wikipedia.org/wiki/AutoTRAX_EDA

---Joel

P.S. -- Vaguely related story about software quality: I have a friend
who
works for a Big Software Company. In general he says that their most
sophisticated users and bug reports come from Europe. They had one guy
in
the
U.K. who was constantly filling bug reports with them -- it was almost
uncanny
how "good" he was at discovering them. At some point it dawned on them
that... hey... this would be a very useful guy to hire! They offered,
he
accepted, and now he's working here in Oregon. It turns out this
fellow
has
been using the software package in question for longer than anyone
who's
currently on staff at the company (!), and he has an excellent memory,
being
able to provide in-depth comparisons and contrasts of the package and
what's
been changed and fixed/broken in it for the past decade. Amazing...

Sometimes that works, sometimes it doesn't.

I literally buried the PSpice support people in accurate bug
reports/"issues".

They thanked me profusely and did nothing.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Rat Brass |
| http://www.analog-innovations.com | 1962 |

America: Land of the Freedom abuser, Because of the Bastards

Are you aware NI(national instrument) software went on sales lately?
That's
an
indication that you dumass going down... Heehee......Halleluiah. Shame on
you arrogant people.


Yup 13 years old.

Shut up pop, why are you not able to fill in the missing word? Because
you're so dumb and stubborn. You want people to conform to your style.

 

[Erik Baigar]

Franc Zabkar wrote:

I can't help, but ISTR that Beckman and Allen Bradley made resistor
arrays at around that time. In any case, wouldn't it be relatively
easy to confirm with a multimeter whether your parts were in fact
resistors?
Thans Franc for this hint. I unmonted the PCBs and tried with a digital

multimeter. The 214-017 indeed is a resistor array containing 12
resistors with 2.2k each. The pin common to all resistors is No 14.
In the application this is connected to +5V and the resistors are used
for pulling up the open collector driven data lines of the 12 bit
machine. There is no resistor present at pin 7. So for this one the
puzzle is solved.

The 214-018 is a resistor array, too. It contains 8 resistors
with 300R each. Two of them are used on the two PCBs holding
the registers of the unit. They seem to be the pull up resistors
for the internal data bus (only 6 resistors are used per array
since each PCB contains 6 bits of the 12 bit length registers).
There are the common pins for the resistors (2,5,9 and 12) which
are all connected to +5V and the resistors are accessible at
pins 1,3,4,6,8,10,11 and 13. Of course I am not able to figure out
which of the common pins is connected to which resistor without
desoldering the chip. But anyhow - this is not important.

The similar looking 214-020 is difficult to measure since the
surrounding circuitry influences the results (I have three instances
of this on in the unit and results differ). If it is a resistor array,
the resistance must be higher than in the 214-017...

Thanks again,

best regards,

Erik.

 

[spy]

On Oct 10, 8:40 am, Lostgallifreyan <no-...@nowhere.net> wrote:

Eeyore <rabbitsfriendsandrelati...@hotmail.com> wrote innews:470C3AC7.E3B53A45@hotmail.com:

Boris Mohar <borism_-voi...@sympatico.ca> wrote:

Could be Tantalum TAR series.

Yes, thats exactly what it is.

So why were you asking if you already knew ?

I knew someone would ask that. He was told what they were, went checking,
found that what he was told was right, and said so. He didn't know before.

Exactly right. I did not know before, I googled and found the answers
after you told me
then came back and posted my findings

thanks again

 

[John Larkin]

On Tue, 5 Jun 2007 21:49:33 -0500, "GPE" <See_GPE_website@cox.net>
wrote:

"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:%Fn9i.13397$RX.11812@newssvr11.news.prodigy.net...
Hello Folks,

Ok, first, those card ejectors from RichCo and other mfgs don't seem to be
in stock anywhere. Is there a place that sells them by the dozens and not
truck loads?

Other: We've designed the boards per spec. Holes for the ejector 250mils
in, boards exactly Eurocard length (160mm) but the boards aren't flush
with the front rails of the VME cage. So maybe those ejectors wouldn't
work anyhow.

Are there any "pull tools" available? We used to have those for ultrasound
machines because ejectors were rattling to much. But that was many moons
ago and I don't have the foggiest where they came from. Basically they
caught the holes and then you cantilevered the board out. Of course,
engineers didn't want to be sissies so we kept pulling by hand until thick
callusses developed.

--
Regards, Joerg

http://www.analogconsultants.com

VME?!?!
Wow, I remember VME... barely.

VME is doing well in the aerospace biz. Its demise has been predicted
for decades, and it continues to grow. CPCI was to be one of its many
predicted killers, based on leveraging commercial silicon, but that
silicon turned out to have half-lives measured in years or maybe
months, which isn't good for product lifetime. PCI sucks anyhow, with
its complexity and limited electrical bus length.

There has been some consolidation in VME, especially with GE Fanuc
"pulling a Vishay" and buying up everybody in sight. That has resulted
in a lot of boards going unsupported or obsolete, which is fine by me.

What's bizarre is how many people are fighting for the VME embedded PC
business, which sounds like a horrific amount of work to sell a
Pentium-based VME master card for numbers like $2K, when I can sell a
waveform generator for over twice that.

John

 

[MooseFET]

"MooseFET" <kensmith@rahul.net> wrote in message
news:fq8hpc$hke$1@aioe.org...

"Jim Thompson" <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote in
message news:bcres3ps8e5p310h1vbscrlr5f3hhlfeh3@4ax.com...
On Thu, 28 Feb 2008 18:14:54 -0800, "Joel Koltner"
zapwireDASHgroups@yahoo.com> wrote:

Hi Joerg,

"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:QlJxj.3261$pl4.18@newssvr22.news.prodigy.net...
But don't you guys use OrCad? I used to, but not anymore.

Yeah, for production stuff we do. I definitely don't *like* that fact,
but
we're in the (not so uncommon) situation that we have a number of ORCAD
licenses that were purchased years ago so switching requires...

1) Outlay of "new purchase price" for the alternative rather than just
shelling out maintenance every year
2) Conversion of current library parts over to new system
3) Re-training of engineers & techs to use the new system

ORCAD is spendy enough that #1 isn't too big of a problem, and our
libraries
still only have hundreds (not thousands) of symbols in them so changeover
there isn't too bad (I wouldn't imagine it'd be more than a month's
effort),
but #3 is difficult to get by some people since they're so used to ORCAD,
they
don't really see its shortcomings, and they're not personally footing the
bill
for it. (I think there's often a "bell curve of happiness" associated
with
mediocre software... new users have problems with everything, regular but
undemanding users are happy because they don't stress the tool much so it
works OK, whereas advanced/demanding users are unhappy again because they
realize that there are so many better options out there).

Sometime this year I'm planning on making a proper (formal) presentation
comparing ORCAD with, e.g., Pulsonix. We'll see what happens...

Heck, is Autotrax still around? That used to be pretty good and I bet
it
won't be expensive anymore.

Autotrax or AutoTRAX? Wikipedia discusses two of them:
http://en.wikipedia.org/wiki/AutoTRAX_EDA

---Joel

P.S. -- Vaguely related story about software quality: I have a friend who
works for a Big Software Company. In general he says that their most
sophisticated users and bug reports come from Europe. They had one guy
in
the
U.K. who was constantly filling bug reports with them -- it was almost
uncanny
how "good" he was at discovering them. At some point it dawned on them
that... hey... this would be a very useful guy to hire! They offered, he
accepted, and now he's working here in Oregon. It turns out this fellow
has
been using the software package in question for longer than anyone who's
currently on staff at the company (!), and he has an excellent memory,
being
able to provide in-depth comparisons and contrasts of the package and
what's
been changed and fixed/broken in it for the past decade. Amazing...


Sometimes that works, sometimes it doesn't.

I literally buried the PSpice support people in accurate bug
reports/"issues".

They thanked me profusely and did nothing.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave



Are you * NI(national instrument) software going on sales lately? That's
an
indication that you dumass going down... Heehee......Halleluiah. Shame on
you arrogant people.

The above was a test to see if the war bastards can fill in the missing
words. Evidently they gave up, the missing words are "aware of"