 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
docyukon(at)ptcnet.net
Guest
|
 Posted: Tue Apr 29, 2014 9:52 am Post subject: lm7321 substatute |
 |
|
Bob Can you recomend a substatute for a lm7321 opamp, in a din package? The
sot23 package is just tooooooo small for me to work with. Thanks
Bill S.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
 |
nuckolls.bob(at)aeroelect
Guest
|
| Posted: Wed Apr 30, 2014 6:44 am Post subject: lm7321 substatute |
|
|
At 12:50 PM 4/29/2014, you wrote:
| Quote: |
Bob Can you recomend a substatute for a lm7321 opamp, in a din
package? The sot23 package is just tooooooo small for me to work
with. Thanks Bill S.
|
What's the application? Can you share a schematic
along with a description of function? There are probably
100+ suitable substitutes with rare exception . . . I
don't want to offer substitute that stumbles over
an exception.
The LM7321 is a fine example of the current state
of op-amp art. Low voltage performance, rail-to-rail
input and outputs, lots of drive capability, etc.
http://tinyurl.com/otlg7je
However, depending on requirements for the circuit
you're crafting, you may NEED few if any of these
stellar features.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
docyukon(at)ptcnet.net
Guest
|
| Posted: Wed Apr 30, 2014 7:28 am Post subject: lm7321 substatute |
|
|
At 10:59 AM 12/22/2011, you wrote:
| Quote: | I am wanting to parllel two Ray Allen RP3 led position indicators useing
only one POS5 position sensor. RAC said that thay wont work just parelling
them and that I need to add another position sensor or a switch which I
would rather not do. Can anyone sudjest an electrical ckt. that would work
for this? Thanks Bill S.
|
You need a 'buffer-amplifier' between the position
feedback potentiometer and ONE of the two indicators.
The problem with paralleling the two indicators arises
from the fact that they're not a 'high impedance' voltmeter.
The system is calibrated for one pot driving one indicator.
Adding a second indicator doubles the load on the position
signal from the potentiometer.
The 'fix' is to convert one of the indicators into a
high-impedance voltmeter. You need an operational
amplifier with rail-to-rail inputs and outputs. A device
like the LM7321 would probably work.
http://search.digikey.com/us/en/products/LM7321MF%2FNOPB/LM7321MFCT-ND/1878646
Adding this device to the second indicator prevents
it from loading the potentiometer. You need to
fabricate something like this . . .
http://aeroelectric.com/Pictures/Schematics/Ray-Allen_Dual_Indicators.pdf
It could be fabricated on an etched circuit board
that would fit inside a d-sub connector back shell.
Bob . . .
| Quote: | >Bob Can you recomend a substatute for a lm7321 opamp, in a din package?
>The sot23 package is just tooooooo small for me to work with. Thanks
>Bill S.
What's the application? Can you share a schematic
along with a description of function? There are probably
100+ suitable substitutes with rare exception . . . I
don't want to offer substitute that stumbles over
an exception.
The LM7321 is a fine example of the current state
of op-amp art. Low voltage performance, rail-to-rail
input and outputs, lots of drive capability, etc.
http://tinyurl.com/otlg7je
However, depending on requirements for the circuit
you're crafting, you may NEED few if any of these
stellar features.
Bob . . .
-----
No virus found in this message.
Checked by AVG - www.avg.com
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
nuckolls.bob(at)aeroelect
Guest
|
| Posted: Wed Apr 30, 2014 11:21 am Post subject: lm7321 substatute |
|
|
At 10:27 AM 4/30/2014, you wrote:
OOOPS! The 7321 was my selection . . . not sure
why I went with SOT23 only except that my head
was probably thinking about packaging in the
dsub housing . . .
Refresh my memory, we ARE talking about a 5v
system? This op amp would do the job
http://tinyurl.com/ol9jm4v
but it's limited to 7.5v max supply voltage.
It IS in stock at Digikey at 0.88 each.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
docyukon(at)ptcnet.net
Guest
|
| Posted: Wed Apr 30, 2014 12:14 pm Post subject: lm7321 substatute |
|
|
The opamp should be rated at least 15v min.
---
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
nuckolls.bob(at)aeroelect
Guest
|
| Posted: Wed Apr 30, 2014 12:36 pm Post subject: lm7321 substatute |
|
|
At 03:13 PM 4/30/2014, you wrote:
| Quote: |
The opamp should be rated at least 15v min.
|
Okay, this one should work
http://tinyurl.com/llsm37s
Let me know how this works for you . . . I'll
revise my document on the website. I could
also whack out a little ecb that would sit
between the solder-cups on a d-sub and make
it a whole lot easier to package . . .
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
nuckolls.bob(at)aeroelect
Guest
|
| Posted: Thu May 01, 2014 4:58 am Post subject: lm7321 substatute |
|
|
At 03:13 PM 4/30/2014, you wrote:
Have you ordered any op-amps yet? I've got
an order going into Digikey this weekend. I
could add some to the list if you're in no
hurry . . .
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
|
| Posted: Thu May 01, 2014 5:44 am Post subject: Re: lm7321 substatute |
|
|
| Quote: | | Bob Can you recomend a substatute for a lm7321 opamp, in a din package? The sot23 package is just tooooooo small for me to work with. Thanks Bill S. |
I want to propose another solution....c'mon bucky! The Swiss could build a watch between the legs of the SOT-23. I have circuits where the SOT-23 parts are the BIG ones.
Seriously, soldering tiny parts is a skill that is not hard to master, but you have to start with--ideally, a nice stereo lab microscope of modest power-- but any good magnifier that you don't have to hold with a hand will do. Then use a fine-tip soldering iron, fine tweezers and some fine-gauge solder.
This is ultimately pretty easy to do. Many electrowhizzies are not available in bigger packages. Everything is shrinking. To work on tiny stuff requires the right tools.
Good luck.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
