Searching \ for '[OT] Alternatives to LM1830' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=alternatives+lm1830
Search entire site for: 'Alternatives to LM1830'.

Exact match. Not showing close matches.
PICList Thread
'[OT] Alternatives to LM1830'
2000\03\15@091350 by Ray Gardiner

flavicon
face
<x-flowed>We manufacture a pic based system which uses the National LM1830
Level Sensor, today I was stunned to find out the part has been
discontinued! (actually sometime in 1998 I believe)...

Eventually we sourced a small quantity at $20-00 each (ouch)

Does anyone know of an equivalent pin compatible part?

This is the LAST time ever I design in a National Semi part.




Ray Gardiner spam_OUTrayTakeThisOuTspamdsp.com.au

</x-flowed>

2000\03\15@093854 by Max Toole

picon face
In a message dated 3/15/00 9:14:00 AM Eastern Standard Time, .....rayKILLspamspam@spam@DSP.COM.AU
writes:

> We manufacture a pic based system which uses the National LM1830
>  Level Sensor, today I was stunned to find out the part has been
>  discontinued! (actually sometime in 1998 I believe)...
>
>  Eventually we sourced a small quantity at $20-00 each (ouch)
>
>  Does anyone know of an equivalent pin compatible part?
>
>  This is the LAST time ever I design in a National Semi part.
>
>
>
>
>  Ray Gardiner rayspamKILLspamdsp.com.au
>
Ray,
I can't help you other than sympathy but I also had the same problem.  I used
the National TP5700AN speech circuit to interface to the telephone line,
along with their TP5089N DTMF tone generator, and they discontinued
manufacturing them.  It can be costly when a manufacturer decides to stop
making a device.
Good luck on finding a replacement,
Max

2000\03\15@101635 by Wagner Lipnharski

picon face
Any electronic component, no exceptions, will be discontinued sooner or
later, some pretty sooner than you can expect and then you end up with a
problem in hands.  If you plan for a industrial production, it would be
safe to think about investments in inventory.  A good agreement between
you and your customers can allow you to stock many months or even years
of components needed for production.

Of course, you have always the boat and the fishing line to try to hook
your daily fish for lunch, but using a freezer and stock some could be a
good idea.

By other side, redesign old projects, new printed circuit boards, new
components, lower power consume, smaller sizes, etc, could always be
reinvigorating for your "new" product, new functions, new face, new
prices...etc...

Wagner.


Max Toole wrote:
{Quote hidden}

2000\03\15@102304 by Andrew Kunz

flavicon
face
>By other side, redesign old projects, new printed circuit boards, new
>components, lower power consume, smaller sizes, etc, could always be
>reinvigorating for your "new" product, new functions, new face, new
>prices...etc...

Which is better known as "Job Security" by Engineering and "Poor Planning" by
Management.

Andy

2000\03\15@103119 by Michael Rigby-Jones

flavicon
face
part 0 3291 bytes
<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Unfortunately obsolescence is a fact of the electronics industry.&nbsp; Technology marches on, leaving dead and unavailable products scattered in it's path.&nbsp; Nat-Semi are not the only or even the worst offenders for this, all the major IC manufacturers announce last time buys almost weekly.&nbsp; I would vent your feelings of frustration not on NatSemi, but on your distributor who should have advised you of this long before now.</FONT></P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">You are most unlikely to get a pin-compatible part for a niche IC like this.&nbsp; You'd be better of designing such a function using commonly available parts such as op-amps.&nbsp; It may take more board space, but it will almost certainly cost less and the parts will be available for many years.</FONT></P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">If you really want an integrated solution then Allegro made a fluid detector, the ULN2924A.&nbsp; However, I don't even know if this is still in production.</FONT></P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Mike Rigby-Jones</FONT>
</P>
<UL>
<P><FONT SIZE=1 FACE="Arial">{Original Message removed}

2000\03\15@104552 by Mark Newland

flavicon
face
Several years ago I looked into alternate options to this IC.  We used
the frequency generated by this device to also drive to the audible
beeper.  Since the beeper had a narrow resonant frequency for maximum
volume, we needed to be fairly close.  The only way to change the
frequency of the LM1830 was to change the cap which meant it was more
difficult for calibration.  Could not find any good substitute 5 years
ago either.

We just finally built our own circuit with one op-amp as a relaxation
amp to put a frequency into the probe.  Another op-amp gate to look at
the voltage drop across the probe in a comparitor configuration.  My
next project is going to attempt to just have the PIC generate the
frequency and use the A/D input for detection.

Ray Gardiner wrote:

{Quote hidden}

2000\03\15@105213 by William Bross

flavicon
face
I'm surprized that the LM1830 lasted until 1998.  I first used it in 1979
when it was only a couple of years old.  I used it to detect radiation
instead of fluids though.  Anyway, I digress.... What kind of fluids are
you detecting?  Simple ON/OFF control?  Any timers involved?  Sounds like
this may be an opportunity in disguise for a PIC.

Bill

At 01:12 AM 3/16/00 +1100, you wrote:
{Quote hidden}

2000\03\15@111842 by Ray Gardiner

flavicon
face
<x-flowed>>I'm surprized that the LM1830 lasted until 1998.  I first used it in 1979
>when it was only a couple of years old.  I used it to detect radiation
>instead of fluids though.  Anyway, I digress.... What kind of fluids are
>you detecting?  Simple ON/OFF control?  Any timers involved?  Sounds like
>this may be an opportunity in disguise for a PIC.
>
>Bill
>

This is a silver recovery machine for recovering silver from
photographic chemicals, mainly fixer and sometimes bleach fix.

There are a 4 level sensing probes (on/off) which control
pumps for managing flow of chemical through the holding
and plating tanks. These are multiplexed onto a single LM1830
using a 4052 mux.  As a matter of interest, the pic controls
the plating current and voltage using PWM to drive an IXYS fet
in a smps up to 30A, so the pic forms an integral part of the
power control loop. Works well, allowing either constant current
or constant voltage modes of operation under software control.

There is a new design scheduled to be done this year, and I
desperately don't want to design new boards etc for the old
system which will soon be phased out.  let alone convincing
the customer to pay for design revisions to a product that's
being phased out.

The new system doesn't need level sensors to control the pumps
the tanks are arranged so that they can overflow without problems
and the filling is based on time rather than sensing the level.

So, I guess I am caught between not being able to continue supplying
the old version, and the new version is still many months away.


Ray Gardiner KILLspamrayKILLspamspamdsp.com.au

</x-flowed>

2000\03\15@113129 by Michael Rigby-Jones

flavicon
face
part 0 4236 bytes
<P><FONT SIZE=2 FACE="Arial">&gt;I'm surprized that the LM1830 lasted until 1998.&nbsp; I first used it in 1979</FONT>
<BR><FONT SIZE=2 FACE="Arial">&gt;when it was only a couple of years old.&nbsp; I used it to detect radiation</FONT>
<BR><FONT SIZE=2 FACE="Arial">&gt;instead of fluids though.&nbsp; Anyway, I digress.... What kind of fluids are</FONT>
<BR><FONT SIZE=2 FACE="Arial">&gt;you detecting?&nbsp; Simple ON/OFF control?&nbsp; Any timers involved?&nbsp; Sounds like</FONT>
<BR><FONT SIZE=2 FACE="Arial">&gt;this may be an opportunity in disguise for a PIC.</FONT>
<BR><FONT SIZE=2 FACE="Arial">&gt;</FONT>
<BR><FONT SIZE=2 FACE="Arial">&gt;Bill</FONT>
<BR><FONT SIZE=2 FACE="Arial">&gt;</FONT>
</P>

<P><FONT SIZE=2 FACE="Arial">This is a silver recovery machine for recovering silver from</FONT>
<BR><FONT SIZE=2 FACE="Arial">photographic chemicals, mainly fixer and sometimes bleach fix.</FONT>
</P>

<P><FONT SIZE=2 FACE="Arial">There are a 4 level sensing probes (on/off) which control</FONT>
<BR><FONT SIZE=2 FACE="Arial">pumps for managing flow of chemical through the holding</FONT>
<BR><FONT SIZE=2 FACE="Arial">and plating tanks. These are multiplexed onto a single LM1830</FONT>
<BR><FONT SIZE=2 FACE="Arial">using a 4052 mux.&nbsp; As a matter of interest, the pic controls</FONT>
<BR><FONT SIZE=2 FACE="Arial">the plating current and voltage using PWM to drive an IXYS fet</FONT>
<BR><FONT SIZE=2 FACE="Arial">in a smps up to 30A, so the pic forms an integral part of the</FONT>
<BR><FONT SIZE=2 FACE="Arial">power control loop. Works well, allowing either constant current</FONT>
<BR><FONT SIZE=2 FACE="Arial">or constant voltage modes of operation under software control.</FONT>
</P>

<P><FONT SIZE=2 FACE="Arial">There is a new design scheduled to be done this year, and I</FONT>
<BR><FONT SIZE=2 FACE="Arial">desperately don't want to design new boards etc for the old</FONT>
<BR><FONT SIZE=2 FACE="Arial">system which will soon be phased out.&nbsp; let alone convincing</FONT>
<BR><FONT SIZE=2 FACE="Arial">the customer to pay for design revisions to a product that's</FONT>
<BR><FONT SIZE=2 FACE="Arial">being phased out.</FONT>
</P>

<P><FONT SIZE=2 FACE="Arial">The new system doesn't need level sensors to control the pumps</FONT>
<BR><FONT SIZE=2 FACE="Arial">the tanks are arranged so that they can overflow without problems</FONT>
<BR><FONT SIZE=2 FACE="Arial">and the filling is based on time rather than sensing the level.</FONT>
</P>

<P><FONT SIZE=2 FACE="Arial">So, I guess I am caught between not being able to continue supplying</FONT>
<BR><FONT SIZE=2 FACE="Arial">the old version, and the new version is still many months away.</FONT>
</P>

<P><FONT SIZE=2 FACE="Arial">Ray Gardiner RemoveMErayTakeThisOuTspamdsp.com.au</FONT>
</P>
</UL>
<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Could you not design a small daughter PCB that will plug into the LM1830's space containing a custom circuit?&nbsp; The PCB would be quite small so many of them could be panelised.&nbsp; At $20 a throw for the genuine article you should be able to make something cheaper with a few op-amps.</FONT></P>

<P><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">Mike</FONT>
</P>

</BODY>
</HTML>
</x-html>

2000\03\15@115014 by Andrew Kunz

flavicon
face
part 0 2305 bytes content-type:text/html;
If you need a level sensor, contact spamBeGoneskipspamBeGonespamrcboats.com

He is using a liquid-based one (capacitor style) in one of his products, and the
manufacturer is local to him.  It is driven using a PIC and works quite well.

Andy











Michael Rigby-Jones <TakeThisOuTmrjonesEraseMEspamspam_OUTNORTELNETWORKS.COM> on 03/15/2000 10:28:19 AM

Please respond to pic microcontroller discussion list <RemoveMEPICLISTspamTakeThisOuTMITVMA.MIT.EDU>








To:      PICLISTEraseMEspam.....MITVMA.MIT.EDU

cc:      (bcc: Andrew Kunz/TDI_NOTES)



Subject: Re: [OT] Alternatives to LM1830








Unfortunately obsolescence is a fact of the electronics industry.
Technology marches on, leaving dead and unavailable products scattered in
it's path.  Nat-Semi are not the only or even the worst offenders for this,
all the major IC manufacturers announce last time buys almost weekly.  I
would vent your feelings of frustration not on NatSemi, but on your
distributor who should have advised you of this long before now.

You are most unlikely to get a pin-compatible part for a niche IC like this.
You'd be better of designing such a function using commonly available parts
such as op-amps.  It may take more board space, but it will almost certainly
cost less and the parts will be available for many years.

If you really want an integrated solution then Allegro made a fluid
detector, the ULN2924A.  However, I don't even know if this is still in
production.

Mike Rigby-Jones

> {Original Message removed}

2000\03\15@115018 by Ray Gardiner

flavicon
face
<x-flowed>Could you not design a small daughter PCB that will plug into the
LM1830's space containing a custom circuit?  The PCB would be quite
small so many of them could be panelised.  At $20 a throw for the
genuine article you should be able to make something cheaper with a
few op-amps.

Mike

Hi Mike,
Good suggestion, much better than the costs of re-doing new boards
and the added advantage is this approach would provide an option
for future servicing of existing systems.

Ray Gardiner EraseMErayspamdsp.com.au

</x-flowed>

2000\03\15@115219 by Andrew Kunz

flavicon
face
Ray,

Use a pressure sensor.  (In the previous response I thought you were looking for
a tilt sensor -sorry).

Anyway, the same guy RemoveMEskipEraseMEspamEraseMErcboats.com uses a pressure sensor to measure the
depth of his subs.  The Motorola sensor we use gave me 1/4" resolution of water
in a column.  Works really nicely.

Andy

2000\03\15@120925 by andy howard

flavicon
face
> The new system doesn't need level sensors to control the pumps
> the tanks are arranged so that they can overflow without problems
> and the filling is based on time rather than sensing the level.
>
> So, I guess I am caught between not being able to continue supplying
> the old version, and the new version is still many months away.

Have you tried contacting any surplus component suppliers? If you only
need a few you might be in luck.












.

2000\03\15@123645 by Mark Newland

flavicon
face
Don't know if they have any stock but Partminer shows that "Pioneer-Standard
Electronics" has these parts for $3.07 each.

2000\03\15@141344 by l.allen

picon face
> >This is the LAST time ever I design in a National Semi part.
> >
Welcome to the club!!!!!!!!

Rather poke myself in the eye with a sharp stick...
personally.

_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

http://www.psych.auckland.ac.nz

_____________________________

2000\03\15@155544 by Robert M. McClure

flavicon
face
At 08:11 AM 3/16/00 +1200, Lance Allen wrote:
>> >This is the LAST time ever I design in a National Semi part.
>> >
>Welcome to the club!!!!!!!!

Permit me to generalize a little bit.  My policy is that whenever I have
been screwed by a semiconductor company (rental car firm, airline, etc..)
I move them to the bottom of the acceptability list.  I do not use them again
until they reach the top half the list.  I am now on my second cycle through
semiconductors.

(And I used to work for one of the biggies.)

Bob McClure

2000\03\15@175013 by Brent Brown

picon face
Hi Ray,

I have a simple and reliable circuit that I developed for a 5 stage
ON/OFF fluid level probe that uses a 40106 or 74HC14 hex scmitt
trigger inverter chip. Minimum component design, works very
reliably. It does need the micro to do a little work to 'decode' the
probe status because output oscillating = probe wet and not
oscillating = probe dry. More fun than using op amps or special
purpose chips. The drop in PCB sounds like a good idea, next best
after scrounging around to find all the LM1830's you can still find.

Brent Brown
Electronic Design Solutions
16 English Street
Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile: 025 334 069
eMail:  RemoveMEbrent.brownspam_OUTspamKILLspamclear.net.nz

More... (looser matching)
- Last day of these posts
- In 2000 , 2001 only
- Today
- New search...