Driver to drive?

[Winfield Hill]

Jonathan Kirwan wrote...

I ran some simulations on the extended version of this schematic and output
current isn't particularly flat relative to the driving voltage as one might
hope for. (I selected the OPA227 as the opamp, the 2N3906/2N3904 for the Q1
equivalents, and the 2SB709A and the 2SD601A for the (+) and (-) side pairs.)

Most spice models do a very poor job of modeling the opamp's supply-pin
currents; your results may be more a test of the model than the circuit.


--
Thanks,
- Win

(email: use hill_at_rowland-dotties-org for now)

 

[James Meyer]

On 26 Oct 2004 16:40:32 -0700, "Steve" <aeroman10@yahoo.com> wroth:

I need the SK100 and SL100 transistors to build the following circuit:
http://www.electronic-circuits-diagrams.com/motorimages/3.gif

The problem is I cant find where to buy those. I look at RadioShack,
they didnt have it. I looked through the DigiKey and Jameco catalog and
they dont have it either..

What are some transistors that are equivalent to and can replace SK100
and SL100 and still make this circuit operational?

Thank you

The SK100 is really a 2SK100. They were originally Japanese transistor
numbers. They always had "2" as the first number so you will very often see
people drop the 2 and just use the rest of the number.

Of course, the US standard, 2Nxxxx, always started with 2 but you never
see those contracted. Don't know why.

Jim

 

[Jim Yanik]

Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> wrote in
news:qeqtn0d56m6u09l8r5jdjsr550306vh3r8@4ax.com:

On 26 Oct 2004 23:31:04 GMT, the renowned Jim Yanik
jyanik@abuse.gov.> wrote:

Do you honestly believe that Saddam Hussein had a passenger jet airframe
for any other purpose than terrorist training?

Dunh. Every airport in the world has firefighters and their training
areas.


Best regards,
Spehro Pefhany

I suspect that there was no evidence that Saddam's was ever used for
"firefighter training".

--
Jim Yanik
jyanik-at-kua.net

 

[Jim Yanik]

Robert Monsen <rcsurname@comcast.net> wrote in
news:tPIfd.256618$wV.26652@attbi_s54:

John Larkin wrote:
On Wed, 27 Oct 2004 04:11:58 GMT, Robert Monsen
rcsurname@comcast.net> wrote:


John Larkin wrote:

On Tue, 26 Oct 2004 19:32:00 GMT, Robert Monsen
rcsurname@comcast.net> wrote:



By the way, if your scroll down to the bottom of the link that mr
Yanik has posted, which attempts to corroborate the iraqi terrorist
story, you find an add for an Ann Coulter book "How to talk to a
Liberal (if you must)". Coulter, of course, deserves a pie in the
face:



What a disgusting statement.


A pie in the face isn't a bullet. It's not even a slap. It's a pie,
John. Whipped cream. It probably tasted good. She apparently laughed
about it.



So, audiences should maybe routinely pack pies to public forums, and
splatter anybody they don't agree with?


Crowds used to routinely bring vegetables to public performances, so
they could pelt people who sucked too badly. Maybe we should try to
bring that back. Unfortunately, given the loyalty oaths required to
see Bush, they would probably frisk people for tomatoes too.

Ever been hit in the face with a vegetable like you suggest? Think it
doesn't hurt? Would you like to risk YOUR eyesight in that manner?

What this means is that you support violence against those of differing
opinions.


--
Jim Yanik
jyanik-at-kua.net

 

[martin griffith]

On Wed, 27 Oct 2004 10:56:03 GMT, in sci.electronics.design you wrote:

I want to make a metal enclosure for an electronics product. The enclosure
will be 4" wide, 6" long, 1" high. Up till now I've been using an
off-the-shelf standard extruded aluminum case. The main cost has been the
CNC milling of the front and rear panels (they both have a few holes for
connectors/buttons/LEDs).
snip
Can anyone please suggest another approach, or comment on those above.

Many thanks,
Steve

Hi Steve, not sure if this link helps, but the prices seem reasonable

for CNCing. But I dont think they will machine user supplied parts
http://www.emachineshop.com/faq/prices.htm




martin

Serious error.
All shortcuts have disappeared.
Screen. Mind. Both are blank.

 

[Tim Wescott]

Steve wrote:

I want to make a metal enclosure for an electronics product. The enclosure
will be 4" wide, 6" long, 1" high. Up till now I've been using an
off-the-shelf standard extruded aluminum case. The main cost has been the
CNC milling of the front and rear panels (they both have a few holes for
connectors/buttons/LEDs). Plus it is a real pain to assemble, since the
front panel is glued to the sides in order to avoid screws showing through
(it's a consumer item). Now I am hopefully going to make them in bigger
batches (500s or so), I've been looking at other approaches to save money
and make assembly easier. So far, the alternatives I've thought about are:

a) Stay with the extruded aluminium and face plates, but use a stick-on
overlay over the front panel, so I can have screw holes in the panel behind
it. However, on such a small unit, I am worried that registration between
overlay and panel (and bubbles?) will make this problematic or at least be
slow during assembly - the less skill/judgement decisions required during
assembly, the better

b) Use a folded aluminium enclosure, one piece for base, front and rear, and
one piece for top and sides. Although this would get rid of the screws
needed to hold the box together, I still need some way of attaching a small
PCB with buttons and LEDs behind the front panel (I'm using foam and glue
for this at the moment!). I guess I could use blind fasteners for this, but
maybe that is not the best/cheapest solution.

c) A mod of (b) that seems to be used for DVD players etc. - folded aluminum
plus a plastic clip-on front panel to make it look nice. The metal panel
behind could then have all the screw holes etc. it needed. Not sure if the
cost of making the plastic panel is feasible for my quantities (500's)

Can anyone please suggest another approach, or comment on those above.

Many thanks,
Steve


With those volumes unless you're cutting costs to the bone you should be

able to justify getting professional help for the packaging. I'd
consider finding a mechanical engineer who can help you out.

Alternately you can go to the enclosure manufacturers to do the work:
just call up the sales staff and say "gee, I'd buy 1000 a year of that
if only I could figure out how to make it work the way I need".

Label manufacturers will be similarly eager to help out, and you can get
polycarbonate labels with embedded switches -- they look really slick
and (to the best of my knowledge) can be quite reliable.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

 

[Anders F]

"Stonent" <zothorn@yahoo.com> wrote in message
news:4f14adf5.0410270712.452b6d05@posting.google.com...

A coworker of mine is looking for a pcmcia card that can open and
close a circuit via software control. It has to be 16bit pcmcia
because the device he is interfacing it to only has pcmcia slots an no
other kind of slot.

Does something like this exists?

Switch for 100A DC or 380V AC? ;-)

Usually stuff with PCMCIA also has a serial or USB port making it a lot
easier and cheaper. Just a small Otherwise you can get parallel or serial
ports on PCMCIA and probably also digital I/O for interface to external
relays, drivers or what ever....
But as you obviously noted: Take care to check that they are 16bit!

/A

 

[Dirk Bruere at Neopax]

ChrisGibboGibson wrote:

Rich Grise wrote:

[snip]


It made me laugh, it made me cry, it made me laugh and cry simultaneously,
which


I've done that twice. The first was when my first daughter was born. The most
powerful, emotional, confused moment in my entire life. The second time it
happened was when I shagged her mum's sister 3 months later. Needless to say
we're not together any more.

Convert to Islam and get the complete set.

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org

 

[John Larkin]

On 27 Oct 2004 14:52:04 GMT, Jim Yanik <jyanik@abuse.gov.> wrote:

Ann is a 'kick' alright. As a comedienne she is funny in a sleasy,
lying, shock-jock sort of way. As a political reporter and analyst,
which is what she claims to be, she is simply a dishonest shill for
the right.


Yet you have no problem with Michael Moore.

Who so far remains, as far as I know, extremely rich and un-pied.

Ann's a lot cuter, anyhow.

John

 

[Steve]

"John Larkin" <jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> wrote in
message news:f3gvn055muhogeh7q3vp2h4q9ij0b91opr@4ax.com...

On Wed, 27 Oct 2004 10:56:03 GMT, "Steve" <me@privacy.net> wrote:

What's wrong with letting screws show? Will that keep people from
buying it?

John

Afraid it might - since the front panel is only 4" x1", a couple of even
small screws will show up quite obviously. It's an audio consumer item for
putting alongside their expensive kit, and so it will help if it looks the
part too.

Steve

 

[Mark Zenier]

In article <417e5970$1$ouf73$mr2ice@giganews.aros.net>,
<uvcceet@juno.com> wrote:

I cannot believe that with all the politics in this group, no one has pointed
out that the J-K in a flip flop is:

J is for John
K is for Kerry

Stop hating each other for a few minutes and pay attention

Internal schematic of a Bush FF

Pwr
_____|_______
| | |
| +-------|- /Q
Data | |
---------------|-----+ |
| | |
Clock | | |
---------------|-----+ |
| | |
| +-------|- Q
| | |
|_____|_______|
|
Gnd

Notes: (1) the outputs appear as valid logic levels but never change.
(2) Any inputs that can change the output are forced to Ground.

Mark Zenier mzenier@eskimo.com Washington State resident

 

[Walter Harley]

"Steve" <me@privacy.net> wrote in message
news:79Lfd.850$J95.550@newsfe5-win.ntli.net...

I want to make a metal enclosure for an electronics product. The enclosure
will be 4" wide, 6" long, 1" high. Up till now I've been using an
off-the-shelf standard extruded aluminum case.

I've been talking to http://www.lansing-enclosures lately; it's still
off-the-shelf extrusions, but they're nicely consumerized, I think. And
they sent me to an overlay manufacturer, http://www.polycraftinc.com.
Between those two I think you could probably get what you need at a
reasonable price.

 

[Tim Wescott]

Steve wrote:

"John Larkin" <jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> wrote in
message news:f3gvn055muhogeh7q3vp2h4q9ij0b91opr@4ax.com...

On Wed, 27 Oct 2004 10:56:03 GMT, "Steve" <me@privacy.net> wrote:

What's wrong with letting screws show? Will that keep people from
buying it?

John



Afraid it might - since the front panel is only 4" x1", a couple of even
small screws will show up quite obviously. It's an audio consumer item for
putting alongside their expensive kit, and so it will help if it looks the
part too.

Steve


Then use black oxide coated stainless hex socket fasteners -- that

should be equally at home in an audio equipment rack or the engine bay
of a race car.



--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

 

[John Larkin]

On Wed, 27 Oct 2004 09:22:21 -0700, Tim Wescott
<tim@wescottnospamdesign.com> wrote:

Steve wrote:

"John Larkin" <jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> wrote in
message news:f3gvn055muhogeh7q3vp2h4q9ij0b91opr@4ax.com...

On Wed, 27 Oct 2004 10:56:03 GMT, "Steve" <me@privacy.net> wrote:

What's wrong with letting screws show? Will that keep people from
buying it?

John



Afraid it might - since the front panel is only 4" x1", a couple of even
small screws will show up quite obviously. It's an audio consumer item for
putting alongside their expensive kit, and so it will help if it looks the
part too.

Steve


Then use black oxide coated stainless hex socket fasteners -- that
should be equally at home in an audio equipment rack or the engine bay
of a race car.

Actually, exposed screws - especially flathead, countersunk, black,
hex-wrench types - give gear a high-end look.

John

 

[Buddy Smith]

In comp.arch.embedded yo <yotango@yahoo.com> wrote:

I am not sure what you are referring to as being too slow. I would
only use the computer software to initialize the SDRAM, not for
reading and writing purposes. My circuit would do the high speed
reading and writing once the computer software initialized the SDRAM.

SDRAM must be refreshed very often. An SDRAM controller handles both
initializing and refershing the RAM. You can't do this over a PCI bus, so
you'll need an SDRAM controller one way or another.

In case this isn't clear: the host PC cannot control PCI SDRAM chips
quickly enough to make them happy. It is quite apparent that you don't
know what SDRAM is or how it works. Go to www.google.com and do some
learning, and you should understand what everyone is saying a little
better.

ttyl,

--buddy

 

[Jim Yanik]

John Larkin <jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> wrote in
news:m6hvn0p78f717lg4nind0bia9539di0s70@4ax.com:

On 27 Oct 2004 14:52:04 GMT, Jim Yanik <jyanik@abuse.gov.> wrote:

Ann is a 'kick' alright. As a comedienne she is funny in a sleasy,
lying, shock-jock sort of way. As a political reporter and analyst,
which is what she claims to be, she is simply a dishonest shill for
the right.

The part above,I did NOT write. Work on your attribs,please.

Yet you have no problem with Michael Moore.


Who so far remains, as far as I know, extremely rich and un-pied.

Ann's a lot cuter, anyhow.

John

--
Jim Yanik
jyanik-at-kua.net

 

[John Larkin]

On 27 Oct 2004 17:45:54 GMT, Jim Yanik <jyanik@abuse.gov.> wrote:

John Larkin <jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> wrote in
news:m6hvn0p78f717lg4nind0bia9539di0s70@4ax.com:

On 27 Oct 2004 14:52:04 GMT, Jim Yanik <jyanik@abuse.gov.> wrote:




Ann is a 'kick' alright. As a comedienne she is funny in a sleasy,
lying, shock-jock sort of way. As a political reporter and analyst,
which is what she claims to be, she is simply a dishonest shill for
the right.

The part above,I did NOT write. Work on your attribs,please.

My newsreader has little >>> sorts of symbols that show the nesting
level. So it's obvious who wrote the last thing or two.

John

 

[Robert Monsen]

Jim Yanik wrote:

Robert Monsen <rcsurname@comcast.net> wrote in
news:ceFfd.321843$D%.318079@attbi_s51:


John Larkin wrote:

On Tue, 26 Oct 2004 19:32:00 GMT, Robert Monsen
rcsurname@comcast.net> wrote:



By the way, if your scroll down to the bottom of the link that mr
Yanik has posted, which attempts to corroborate the iraqi terrorist
story, you find an add for an Ann Coulter book "How to talk to a
Liberal (if you must)". Coulter, of course, deserves a pie in the
face:



What a disgusting statement.


A pie in the face isn't a bullet. It's not even a slap. It's a pie,
John. Whipped cream. It probably tasted good. She apparently laughed
about it.


It IS assault.And one can have their eyesight damaged by this sort of
attack.

But truly all it is is an attempt to silence someone with an opinion
opposite of the attackers.

And YOU support that,it would seem.

You've caught me. I also, on occasion, have been known to shoot rubber
bands, and to run with scissors. Lock me up!

Ann is a 'kick' alright. As a comedienne she is funny in a sleasy,
lying, shock-jock sort of way. As a political reporter and analyst,
which is what she claims to be, she is simply a dishonest shill for
the right.



Yet you have no problem with Michael Moore.

Well, if some young republicans decided to pie michael moore, I wouldn't
be accusing them of 'violence'. In my opinion that would be an overreaction.

--
Regards,
Robert Monsen

"Your Highness, I have no need of this hypothesis."
- Pierre Laplace (1749-1827), to Napoleon,
on why his works on celestial mechanics make no mention of God.

 

[hamilton]

Found this on Google:

http://www.hamtronics.com/rwwv.htm

Many more here:

http://www.google.com/search?hl=en&q=wwv+circuits

Chuck Olson wrote:

I recently bought a couple of La Crosse Technology digital clocks that are
designed to start listening for the WWVB signal at 60 KHz at midnight, and
every hour until 6AM. I have a ham transceiver IC-765 that goes down to 30
KHz (too bad they don't mention this fact in the specifications of the
equipment) and I've been able to pick up the signal with a loopstick coil
and resonant capacitor using a source follower interface to the receiver
input, with some success, but I would like to qualify other locations in the
house besides the immediate vicinity of the ham station - - hopefully more
quickly than mounting the clock and waiting to see if it updates its
setting.

Ideally, I would like to take apart a small WWVB sync-able clock and tap
into its wiring with an LED driver so that I could see the LED flash in time
with the 1 BPS carrier modulation. Has anyone tried anything like this, and
is there a website that might show details of the conversion? I'm open to
other ways to do it as well and welcome suggestions.

Thanks,

Chuck

 

[Jim Thompson]

On Wed, 27 Oct 2004 19:45:16 GMT, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

Hi Chuck,

Most units or kits I saw are for shortwave. But since you probably don't
want to spend much you might just take an opamp quad pack that can do
20dB or so each at 60KHz, cascade a few of those and place an AM
detector after that. That detector could be a diode or for better
sensitivity a transistor 'in reverse'. Save one of the opamps to drive
headphones.

Of course filtering will be the big challenge. That could be either a
crystal or two if you can get them cheaply or from a scrap 'atomic
clock'. Or use LC resonant filtering. It'll drift a bit but if you stay
up late one day just tune it in and then walk around the house with it.
It should hold for those few minutes. Use fixed caps and a small vernier
cap so it won't loose tuning so easily when you bump into something with it.

I had done this once for a school project so that students could listen
to the signal and it worked great. I was lazy this time when we bought a
60KHz clock and did the "move until it worketh" scheme. The problem with
well insulated houses is the aluminum backed fiber wool in outer walls.
I could only get it going when hanging it on a wall opposite of a large
window facing east.

Regards, Joerg

http://www.analogconsultants.com

If you're into transistor-level designs, there's a complete WWVB
receiver on my website. It's quite old, like 30 years ago, so today's
OpAmps should do it quite well.

The only trick is that synchronous detection is necessary to get out
of the man-made noise at 60KHz. The way I did the data detection was
with coherent AGC.

...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 |

I love to cook with wine. Sometimes I even put it in the food.