Op-Amp Gain and Offset Design for the HP-67

[Stefan Vorkoetter]

I've posted yet another program for the HP-67/97 to my web site. This one is for designing analog gain and offset stages using a single op-amp. Program listing, usage instructions, and background info can all be found at http://www.stefanv.com/calculators/hp67_offset_gain.html.

Enjoy,
Stefan

PS. I've also put some effort into creating presentable images of the magnetic card, in the style of pre-recorded cards from HP. I'd be curious to know if these look right in browsers other than IE and Mozilla.

[Etienne Victoria]

Hello Stefan,

I do not have the knowledge to test your program but the magnetic card is a beautiful job.

It looks perfect on Safari 3.2.1

Cheers!

Etienne

[Prabhu Bhooplapur]

Hi Stefan,
This is nostalgic for me - reminding good old days of analog design. There was a time when any electronic circuit was conceived with op-amps. The magnetic card has come out well. Have you tried the emulators of HP67 and HP97 from Michael O'Shea at limpidfox.com? The emulators also give good documentation of program listing.

Best regards,

Prabhu Bhooplapur

[Stefan Vorkoetter]

Quote:

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There was a time when any electronic circuit was conceived with op-amps.

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Many still are. Even with the trend to do signal processing digitally, analog stages are still needed to get the data into the digital system, and often to get it back out as well.

I still design a lot of hobby projects using op-amps (many are posted on my web site), and I sometimes get comments like, "you could have done this using the [PIC/ATMEL/...] single-chip computer". I think that in a way, analog design is to digital design like using a slide rule or RPN calculator is to using a computer. To do analog design, you really need to understand the problem.

Stefan Vorkoetter

[Tom Mathes]

Quote:

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Many still are. Even with the trend to do signal processing digitally, analog stages are still needed to get the data into the digital system, and often to get it back out as well.

I still design a lot of hobby projects using op-amps (many are posted on my web site), and I sometimes get comments like, "you could have done this using the [PIC/ATMEL/...] single-chip computer". I think that in a way, analog design is to digital design like using a slide rule or RPN calculator is to using a computer. To do analog design, you really need to understand the problem.

Stefan Vorkoetter

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I'm one of those people who still do pure analog design and do it for a living (I design power management ICs). There still is a place in the electronics food chain for our expertise. I think.

[Garth Wilson]

I expect that op-amp sales are continuing to increase as op amps are reaching performance levels that could not have been imagined 20 years ago. They will always be faster than digital, and for many applications, remain more economical. And, as Stefan pointed out, digital needs op amps to handle analog signals. I still design lots of op amps into our products, with no end in sight.

[Tom Mathes]

Quote:

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I've posted yet another program for the HP-67/97 to my web site. This one is for designing analog gain and offset stages using a single op-amp. Program listing, usage instructions, and background info can all be found at http://www.stefanv.com/calculators/hp67_offset_gain.html.

Enjoy,
Stefan

PS. I've also put some effort into creating presentable images of the magnetic card, in the style of pre-recorded cards from HP. I'd be curious to know if these look right in browsers other than IE and Mozilla.

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Now if the program can be modified to determine where that hidden pole is in the unity gain buffer for an IC I'm designing it'll be perfect! ;-)

Tom