Driver to drive?

snipped:

Guy Macon wrote:
I wanted my first product to be a fairly slow seller. I have some

All in all, the new business is off to a satisfactory start.
= = = = = = = = = = = =

Guy:
Do you really think we can believe this story. Gosh... I have started
a few businesses of my own and I never did want a slow seller or a slow
start. The best problem in the world to try to work out is to have
too much demand for your product.....
electricitym
..
..
..

 

[Don Lancaster]

electricitym@yahoo.com wrote:

snipped:
Guy Macon wrote:
I wanted my first product to be a fairly slow seller. I have some

All in all, the new business is off to a satisfactory start.
= = = = = = = = = = = =

Guy:
Do you really think we can believe this story. Gosh... I have started
a few businesses of my own and I never did want a slow seller or a slow
start. The best problem in the world to try to work out is to have
too much demand for your product.....
electricitym
.
.
.

There is a tendency to overestimate the number of people building
traditional electronic breadboards in the US by four or five orders of
magnitude.

I'd guess the total to be around 137.

Of those few remaining, most of them are extremely well funded by large
corporations with deep pockets.

--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com

Please visit my GURU's LAIR web site at http://www.tinaja.com

 

[Jaye Gallagher]

santec wrote:

Have a look at Rod Elliott's Webpage. I've build his Low Balanced
Microphone Preamp (http://sound.westhost.com/project66.htm) myself.
I'm running it from 2 9V Blocks (one for +9V and one for -9V) and it
works just perfect. Added two 2k resistors from +9V to balanced inputs
followed by two capacitors as phantom power supply.

Mmm, this does look pretty much perfect for my purposes (Though the TL071
has now been superceeded by the TL051). How much current does it draw
(typical and maximum, if possible) when in operation? Any idea at all?

Thanks,
Jaye.

 

[Paul Burke]

John Larkin wrote:

On Mon, 13 Dec 2004 02:16:23 GMT, Rich Grise <rich@example.net> wrote:


Anybody ever heard of anything like this? It sounds pretty cool, if it's
not just pie-in-the-sky.



All this nanotech stuff is like that. Every time somebody discovers an
obscure effect, they seem obliged to say that it will lead to a cure
for cancer or flying cars or something. Never does.

Anyone remember magnetic bubble memory? Did anyone ever get to use it?

Paul Burke

 

[Paul Burke]

ILYA wrote:

Some lands use another voltage levels...
For analogous local telephone network in my city:
not hold 60V
hold 6..15V
ring ... up to 200V! (be careful!)
pair cable.

Probably dates back to one of Stalin's 5 year plans- Inspired by the
World's Greatest Engineer, our engineers, instructed to construct a 48V
telephone network, not only completed installation 2 years ahead of
plan, but achieved a 25% improvement in voltage...

Paul Burke

 

[John Larkin]

On Tue, 14 Dec 2004 08:58:23 +0000, Paul Burke <paul@scazon.com>
wrote:

John Larkin wrote:

On Mon, 13 Dec 2004 02:16:23 GMT, Rich Grise <rich@example.net> wrote:


Anybody ever heard of anything like this? It sounds pretty cool, if it's
not just pie-in-the-sky.



All this nanotech stuff is like that. Every time somebody discovers an
obscure effect, they seem obliged to say that it will lead to a cure
for cancer or flying cars or something. Never does.


Anyone remember magnetic bubble memory? Did anyone ever get to use it?

No. Intel spent a billion or something on that, which is interesting
because it was, so to speak, the enemy of silicon ICs. They dumped
several billion on Itanic. Funny, big companies, who *can* hire the
best experts and who can spend millions on market research, are as
clueless about what will sell as small ones.

John

 

[Guy Macon]

electricitym@yahoo.com wrote:

Do you really think we can believe this story.

You have obviously mistaken me for someone who cares what you think.

The best problem in the world to try to work out is to have
too much demand for your product.....

Yes, that's a rather happy problem to have, but the fact remains
that not all businesses solve it properly, and some have gone
belly up from too much growth too soon. Once you get a reputation
for poor customer service, it's really hard to unscramble that
particular egg.

 

[Guy Macon]

Don Lancaster wrote:

There is a tendency to overestimate the number of people building
traditional electronic breadboards in the US by four or five orders of
magnitude.

I'd guess the total to be around 137.

Perker-Hannifin alone has more than that.

 

[Guy Macon]

Rich Grise wrote:

Could you at least use DIP paddle switches? I found a link to DIP rocker
switches:
http://www.unicornelectronics.com/switches.html#Anchor-Rocker-14210

There's another kind that they call a "piano switch," which is more what I
had in mind for a paddle switch, but I'm too lazy to search them out any
more.

Thanks for the link.

The switch I am using now is like a bunch of tiny slide switches,
easy to actuate by hand. The dip rocker switches were harder to
atuate by hand, but i didn't try the piano style. I will take a
look at it. Your advice is much appreciated.

 

[Kryten]

"Paul Burke" <paul@scazon.com> wrote in message
news:327om4F3jdoljU2@individual.net...

Anyone remember magnetic bubble memory? Did anyone ever get to use it?

I remember it.

It did get used a few times, IIRC once in a fighter aircraft.
Perhaps it was less vulnerable to nuclear radiation upsets,
and it remembered stuff even without power.

 

[Richard The Troll]

On Tue, 14 Dec 2004 13:55:12 -0800, John Larkin wrote:

Or, maybe, it was just luck. For every successful entrepreneur, there
were a dozen, or maybe a hundred, failures. The successes like to
think they were wise, but maybe their success was accidental.

The scairy thing about a "planned economy" is that idiots wouldn't be
allowed to take chances.

Hairy scary, even!

;^j
Rich

 

[Jaye Gallagher]

Allan Herriman wrote:

Err, I meant that the '2019 would be better than the *entire board*,
not just the opamp. The '2019 isn't an opamp; it's an (almost)
complete mic preamp.

BTW, I think you can get samples of the '2019 for free from the AD web
site.

Ahh. I see what you mean. Looks like it's a complete preamp, only needing a
bypass capacitor, and a gain resistor. Shall try to get some samples...

Thanks,
Jaye.

 

[James Beck]

In article <5eavr0pv4bfhr880a47uu3vs4kob6f902i@4ax.com>,
speffSNIP@interlogDOTyou.knowwhat says...

to my next bill, though.

They've always been fast with samples, but sometimes I wonder if they
just make enough parts initially to send out samples...


Best regards,
Spehro Pefhany

We use a couple of parts that are Maxim specific.
Once, when the part was listed as 14 weeks out, I jokingly asked one of
the phone reps for 1000 samples. Fortunately we found the part at a
stocking distributor, unfortunately it was double the direct price. At
least the pricing of the product has enough fudge factor to absorb
something like that (as long as it doesn't happen too often).

Jim

 

[Dirk Bruere at Neopax]

Kryten wrote:

"Paul Burke" <paul@scazon.com> wrote in message
news:327om4F3jdoljU2@individual.net...


Anyone remember magnetic bubble memory? Did anyone ever get to use it?


I remember it.

It did get used a few times, IIRC once in a fighter aircraft.
Perhaps it was less vulnerable to nuclear radiation upsets,
and it remembered stuff even without power.

I was hoping it would kill discs.
I've been hoping something would ever since.
The idea of holding vast amounts of data in mechanical memories is pretty
aesthetically repulsive.

--
Dirk

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

 

[Rich Grise]

On Wed, 15 Dec 2004 20:45:33 +0000, John Woodgate wrote:

I read in sci.electronics.design that Phil Hobbs <pcdh@SpamMeSenseless.u
....
(I still
don't know how to become CEO, and if I did, I wouldn't tell you lot.)
....
My normal Usenet fees apply to the training course given above.

Oh, we all know how to _do_ the job. The problem is how to _get_ it. ;-)

Cheers!
Rich

 

[Tim Wescott]

James Roberts wrote:

In general terms, what is the preferred design approach for minimizing
phase distortion when using a second order active LPF?

In this case it is a PWM audio signal from a PIC micro.

Thanks for your reply.

James

Run screaming?

Your best bet is to use a filter with higher damping. With a strictly
low-pass filter (actually with any filter that has no unstable zeros)
the shape of the phase response is exactly determined by the shape of
the amplitude response.

Seach for "Gaussian filter". You'll be dismayed at the fact that your
shape factor will get worse, not better. Live with it.

There are some 5th-order monolithic filters out there, but I can't
recall who makes them.

--

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

 

[Ban]

James Roberts wrote:

In general terms, what is the preferred design approach for minimizing
phase distortion when using a second order active LPF?

In this case it is a PWM audio signal from a PIC micro.

Thanks for your reply.

James

So you have over/undershoots or even ringing at the output. This can be
avoided with a Bessel characteristic of the lowpass. This filter
characteristic is especially useful in digitally driven circuits with short
rise/fall times.
--
ciao Ban
Bordighera, Italy

 

[Frithiof Andreas Jensen]

"Walter Lolham" <wlolham@civica.com.au> wrote in message
news:41c0dace$1_1@news.iprimus.com.au...

If I don't find a suitable power supply, I may have to do some
modifications, or use 2 power supplies.

http://www.national.com/apnotes/SwitchingRegulators.html - easiest is to get
an evaluation board and hack that. that's what they are for.

The simplest approach is to use a Boost or Flyback topology designed for the
voltage where the main power is taken and then supply the additional
voltages from Auxilliary windings on the core. They will track within a few
%.

You need to specify the currents AND the voltages - it's very important, the
33 V f.ex. could be for varactor tuning, pulling at most 10 mA, in which
case a capacitive step-up ic may be all one needs and 13.5 - 18 smells of
Internal Regulator - in which case you dont really have to do it.

The other reason I wanted to utilize the existing power supply was so
that I could easily toggle between a 12VDC or 240VAC power source by
simply flicking a 2 pole switch.

Good way of getting killed and/or blowing stuff up - Use a Lump-in-the-cord
or Wall wart for the 240; that way someone will not plug this thing in with
the supply set to the wrong voltage and *you* don't have to worry about
safety isolation and the insurance not paying up.

 

[Pooh Bear]

banu wrote:

Hi all,
I want to develop an miswiring protection ckt

What is a 'miswiring protection circuit' ?

Dream on !


Graham

 

[Frithiof Andreas Jensen]

"Robert Baer" <robertbaer@earthlink.net> wrote in message
news:41BAE828.F7F2D943@earthlink.net...

You just tossed out two excellent solutions.

very common:

People presumably ask for advice, but what they really want is to be told
that whatever they are doing is the right thing. Ego Massage.

If someone *want* to do something, they should just *do it* - and be "men"
about the *consequences*!!! Instead of wasting time and presenting like
pathetic whingers and worriers.

I have seen "managers" ask more than 10 people for "advice" until, finally,
some nitwit (or accomplished office politician) does a replay of the
managers proposal - which will then be Good Advice.