RESISTOR-CALC tool is down.

iConduct

Hello Team,

The link to initate this tool redirects to the E2E page. Would this be a known issue? Any guidance on this matter would be greatly appreciated.

http://www.ti.com/tool/resistor-calc

Regards,

Sem Amesawu

over 11 years ago

0 PASCAL SIMON HOULE over 11 years ago

Prodigy 20 points

It is still down. Do we know when it will be back up?

Thanks

SImon

0 jeff johnson96211 over 10 years ago in reply to PASCAL SIMON HOULE

Prodigy 50 points

Resistor-Calc and all the other calculators have been down for about a year now. I really liked this tool, please put it back on line!!!!

0 Bonnie Baker - WEBENCH Design Center over 10 years ago in reply to jeff johnson96211

TI__Expert 3555 points

Jeff,

What exactly did this tool do for you?

There is an excel based resistor calculator on the TI site. The name of this tool is: EXCELRESISTORCALC. Please look at this and let me know if it meets your needs.

0 jeff johnson96211 over 10 years ago

Prodigy 50 points

Hi Bonnie,

The excel resistor calc is just a standard value look up table. Resistor-calc is much more and defined below, as taken off of TI’s web page.

This is a TI calculator tool that has been available for years and located at this web location: http://www.ti.com/tool/resistor-calc

Go to this location and try to click on the Initiate RESISTOR-CALC

It is supposed to take you to the tool, but instead goes to the E2E page. This is very frustrating. All the good TI calculators now do this, there are quite a few.

RESISTOR-CALC is a resistor selection tool for op amp design. This KnowledgeBase Javascript utility calculates the resistor values required for any combination of op amp gain, attenuation, and/or offset.

Thank you so much for your attention to this issue. It has been a source of frustration for my for about a year now.

Regards,

Jeff

From: Bonnie Baker - WEBENCH Design Center [mailto:bounce-597123@mail.e2e.ti.com]
Sent: Friday, January 24, 2014 12:33 PM
To: analog_elab@mail.e2e.ti.com
Subject: RE: [Webench Tools Forum] RESISTOR-CALC tool is down.

Jeff,

What exactly did this tool do for you?

There is an excel based resistor calculator on the TI site. The name of this tool is: EXCELRESISTORCALC. Please look at this and let me know if it meets your needs.

0 Stephen W Roberts over 10 years ago in reply to Bonnie Baker - WEBENCH Design Center

Prodigy 50 points

Hi Bonnie,

I'm with Jeff on this one. I used to use this tool frequently, and one day (seems like >2 years ago now) the link to the tool redirects to some other TI site unrelated to the tool. The tool itself is the implementation of single-supply opamp signal conditioning techniques described in Ron Mancini's book. Bruce Carter also did a writeup which was released by TI as SLOA097.

Similar material was also released as SLOA030A, "Single Supply Opamp Design Techniques" by Ron Mancini.

Here is the link that should invoke the online tool: http://www.ti.com/tool/resistor-calc

but clicking on the tool link just directs you to an unrelated TI site.

Do you think there's anything that can be done to restore this online tool so we can use it?

Thanks!

-Steve Roberts

0 Gareth over 10 years ago in reply to Stephen W Roberts

Prodigy 60 points

Yep, went to my bookmark for the tools today and it's not there! I can't remember if it was this one or another one that used to give you very loose parameters for calculating Op-amp gains then you could choose which E range of resistors you wanted to use? Well handy for calculating non-inverting op-amp gains with the pesky 1+ !

Please bring them all back TI!

My bookmark for one of them was here:

Op Amp Gain Stage Calculator - Semiconductor Technical Support at Texas Instruments

Gareth

0 David Burton over 8 years ago in reply to Gareth

Expert 1330 points

Me too TI. Where is the spreadsheet? Someone must still have a copy.

0 Stephen W Roberts over 8 years ago in reply to David Burton

Prodigy 50 points

Have a look here:

earmark.net/.../gain_offset.htm

However, at least for Case 2 (positive slope negative offset), the offset calculation is incorrect. I didn't try the other cases.

0 David Burton over 8 years ago in reply to Stephen W Roberts

Expert 1330 points

Thanks. I've been replicating the spreadsheet in Mathcad. I see the error in that case. Two of the resistors come up with wrong values. Haven't checked the other cases at that site much yet.

0 JC Zhu over 8 years ago

TI__Mastermind 30705 points

Are you looking for this?

Thanks,

0 Stephen W Roberts over 8 years ago in reply to JC Zhu

Prodigy 50 points

Hi JC,

Thanks, but that's not it. The calculator everyone is looking for does resistor selections for signal conditioning with opamps.

Here's what it looks like:
www.ti.com/.../resistor-calc.jpg

and here's a working version:
earmark.net/.../gain_offset.htm
except this version does not calculate correctly, at least for CASE 2.

Here's the main calculator support page of Bruce Carter (TI employee, worked with Ron Mancini):
http://earmark.net/gesr/opamp/
and the calculator we want is at the top of the list, but it has errors at least for case 2.

So apparently nobody can find a working version of the calculator. Any ideas?

Thanks!
-Steve

0 David Burton over 8 years ago in reply to JC Zhu

Expert 1330 points

No. We are looking for the spreadsheet that computes resistors for OP amp circuits given any arbitrary input and output gain, offset and polarity. A link given up above a ways has the right idea, but it's a website not the spreadsheet and it has some computational faults.

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RESISTOR-CALC tool is down.