From tim at wescottdesign.com Fri Oct 22 16:48:30 2010 From: tim at wescottdesign.com (Tim Wescott) Date: Fri, 22 Oct 2010 09:48:30 -0700 Subject: [Orcnet] 165C -- anybody got _really_ high temp circuit experience? Message-ID: <4CC1C05E.1040703@wescottdesign.com> I've got a prospect who wants some work done, combining software, hardware, and signal processing. The business end of this is going to be down in an oil well, where things are hot. It needs to work at 150C, and he likes to test things at 165C. Furthermore it's attached to a drilling head, so it's a high vibration/shock environment. There are a lot of kinks and quirks to this (not least of which is using off the shelf components well beyond their maximum ratings). I'm figuring that I'll be doing the signal processing and possibly the firmware. But I don't think the customer is going to be eager to pay me to learn how to do the high-temp circuit design. So if you have similar high temperature circuits experience, or if you know someone who has, let me know or point them to me. Thanks in advance. -- Tim Wescott Wescott Design Services Voice: 503-631-7815 Cell: 503-349-8432 http://www.wescottdesign.com From stevewetterling at comcast.net Fri Oct 22 17:02:55 2010 From: stevewetterling at comcast.net (Steve Wetterling) Date: Fri, 22 Oct 2010 10:02:55 -0700 Subject: [Orcnet] 165C -- anybody got _really_ high temp circuit experience? In-Reply-To: <4CC1C05E.1040703@wescottdesign.com> References: <4CC1C05E.1040703@wescottdesign.com> Message-ID: <000501cb720a$f9073670$eb15a350$@net> The Anadigm switched capacitor analog signal processor IC is represented to be particularly well suited to high temp environments like this based on existing successful applications. What kind of analog frequencies are being talked about? The Anadigm technology is good for milli-Hertz bandwidths at very low frequencies. Please tell me more. Steve Wetterling Cell 503-860-5594 -----Original Message----- From: orcnet-bounces at eeconsult.org [mailto:orcnet-bounces at eeconsult.org] On Behalf Of Tim Wescott Sent: Friday, October 22, 2010 9:49 AM To: orcnet Subject: [Orcnet] 165C -- anybody got _really_ high temp circuit experience? I've got a prospect who wants some work done, combining software, hardware, and signal processing. The business end of this is going to be down in an oil well, where things are hot. It needs to work at 150C, and he likes to test things at 165C. Furthermore it's attached to a drilling head, so it's a high vibration/shock environment. There are a lot of kinks and quirks to this (not least of which is using off the shelf components well beyond their maximum ratings). I'm figuring that I'll be doing the signal processing and possibly the firmware. But I don't think the customer is going to be eager to pay me to learn how to do the high-temp circuit design. So if you have similar high temperature circuits experience, or if you know someone who has, let me know or point them to me. Thanks in advance. -- Tim Wescott Wescott Design Services Voice: 503-631-7815 Cell: 503-349-8432 http://www.wescottdesign.com _______________________________________________ Orcnet mailing list Orcnet at eeconsult.org http://eeconsult.org/mailman/listinfo/orcnet __________ Information from ESET Smart Security, version of virus signature database 5555 (20101022) __________ The message was checked by ESET Smart Security. http://www.eset.com __________ Information from ESET Smart Security, version of virus signature database 5555 (20101022) __________ The message was checked by ESET Smart Security. http://www.eset.com From hiker26 at ix.netcom.com Fri Oct 22 17:54:07 2010 From: hiker26 at ix.netcom.com (Brian Conley) Date: Fri, 22 Oct 2010 10:54:07 -0700 (GMT-07:00) Subject: [Orcnet] 165C -- anybody got _really_ high temp circuit experience? Message-ID: <30344815.1287770047650.JavaMail.root@wamui-cynical.atl.sa.earthlink.net> Related Sidebar Information: Back in 1984 when I was taking my comprehensive exam for my masters I was asked several questions about triodes. This surprised me because all of my physical device theory up to that point had been solid state. The reason I was asked is that University of Arizona had some sort of grant from an undisclosed agency to develop "Thermionic Integrated Circuits", essentially chip vacuum tubes or vacuum tubes on a chip. The reasons were for the conditions you describe. Perhaps this can give you two other things to search on. (U of A & Thermionic ICs) -----Original Message----- >From: Steve Wetterling >Sent: Oct 22, 2010 10:02 AM >To: 'Tim Wescott' , 'orcnet' >Subject: Re: [Orcnet] 165C -- anybody got _really_ high temp circuit experience? > >The Anadigm switched capacitor analog signal processor IC is represented to >be particularly well suited to high temp environments like this based on >existing successful applications. What kind of analog frequencies are being >talked about? The Anadigm technology is good for milli-Hertz bandwidths at >very low frequencies. > >Please tell me more. > >Steve Wetterling >Cell 503-860-5594 > > >-----Original Message----- >From: orcnet-bounces at eeconsult.org [mailto:orcnet-bounces at eeconsult.org] On >Behalf Of Tim Wescott >Sent: Friday, October 22, 2010 9:49 AM >To: orcnet >Subject: [Orcnet] 165C -- anybody got _really_ high temp circuit experience? > >I've got a prospect who wants some work done, combining software, >hardware, and signal processing. The business end of this is going to >be down in an oil well, where things are hot. It needs to work at 150C, >and he likes to test things at 165C. Furthermore it's attached to a >drilling head, so it's a high vibration/shock environment. There are a >lot of kinks and quirks to this (not least of which is using off the >shelf components well beyond their maximum ratings). > >I'm figuring that I'll be doing the signal processing and possibly the >firmware. But I don't think the customer is going to be eager to pay me >to learn how to do the high-temp circuit design. So if you have similar >high temperature circuits experience, or if you know someone who has, >let me know or point them to me. > >Thanks in advance. > >-- >Tim Wescott >Wescott Design Services >Voice: 503-631-7815 >Cell: 503-349-8432 >http://www.wescottdesign.com > > >_______________________________________________ >Orcnet mailing list >Orcnet at eeconsult.org >http://eeconsult.org/mailman/listinfo/orcnet > > >__________ Information from ESET Smart Security, version of virus signature >database 5555 (20101022) __________ > >The message was checked by ESET Smart Security. > >http://www.eset.com > > > >__________ Information from ESET Smart Security, version of virus signature >database 5555 (20101022) __________ > >The message was checked by ESET Smart Security. > >http://www.eset.com > > >_______________________________________________ >Orcnet mailing list >Orcnet at eeconsult.org >http://eeconsult.org/mailman/listinfo/orcnet Brian Conley, PE Circuitsville Engineering LLC www.circuitsvilleeng.com Voice - 503-530-6520 FAX - 503-574-2066 bconley at circuitsvilleeng.com From tim at wescottdesign.com Fri Oct 22 18:10:21 2010 From: tim at wescottdesign.com (Tim Wescott) Date: Fri, 22 Oct 2010 11:10:21 -0700 Subject: [Orcnet] 165C -- anybody got _really_ high temp circuit experience? In-Reply-To: <30344815.1287770047650.JavaMail.root@wamui-cynical.atl.sa.earthlink.net> References: <30344815.1287770047650.JavaMail.root@wamui-cynical.atl.sa.earthlink.net> Message-ID: <4CC1D38D.3070501@wescottdesign.com> I'm looking for a warm body, not cold theory. Current commercial practice is to use parts rated for the temperature where possible, and otherwise use off the shelf parts that have been re-specified as necessary to work. Vacuum tubes are not used, to my knowledge, nor are super-custom silicon carbide ICs. Instead, people buy lots of parts from lots of manufacturers, and test them out at elevated temperatures to see which ones actually work. On 10/22/2010 10:54 AM, Brian Conley wrote: > Related Sidebar Information: > Back in 1984 when I was taking my comprehensive exam for my masters I was asked > several questions about triodes. > This surprised me because all of my physical device theory up to that point had been > solid state. > The reason I was asked is that University of Arizona had some sort of grant > from an undisclosed agency to develop "Thermionic Integrated Circuits", > essentially chip vacuum tubes or vacuum tubes on a chip. > The reasons were for the conditions you describe. > Perhaps this can give you two other things to search on. > (U of A& Thermionic ICs) > > -----Original Message----- > >> From: Steve Wetterling >> Sent: Oct 22, 2010 10:02 AM >> To: 'Tim Wescott', 'orcnet' >> Subject: Re: [Orcnet] 165C -- anybody got _really_ high temp circuit experience? >> >> The Anadigm switched capacitor analog signal processor IC is represented to >> be particularly well suited to high temp environments like this based on >> existing successful applications. What kind of analog frequencies are being >> talked about? The Anadigm technology is good for milli-Hertz bandwidths at >> very low frequencies. >> >> Please tell me more. >> >> Steve Wetterling >> Cell 503-860-5594 >> >> >> -----Original Message----- >> From: orcnet-bounces at eeconsult.org [mailto:orcnet-bounces at eeconsult.org] On >> Behalf Of Tim Wescott >> Sent: Friday, October 22, 2010 9:49 AM >> To: orcnet >> Subject: [Orcnet] 165C -- anybody got _really_ high temp circuit experience? >> >> I've got a prospect who wants some work done, combining software, >> hardware, and signal processing. The business end of this is going to >> be down in an oil well, where things are hot. It needs to work at 150C, >> and he likes to test things at 165C. Furthermore it's attached to a >> drilling head, so it's a high vibration/shock environment. There are a >> lot of kinks and quirks to this (not least of which is using off the >> shelf components well beyond their maximum ratings). >> >> I'm figuring that I'll be doing the signal processing and possibly the >> firmware. But I don't think the customer is going to be eager to pay me >> to learn how to do the high-temp circuit design. So if you have similar >> high temperature circuits experience, or if you know someone who has, >> let me know or point them to me. >> >> Thanks in advance. >> >> -- >> Tim Wescott >> Wescott Design Services >> Voice: 503-631-7815 >> Cell: 503-349-8432 >> http://www.wescottdesign.com >> >> >> _______________________________________________ >> Orcnet mailing list >> Orcnet at eeconsult.org >> http://eeconsult.org/mailman/listinfo/orcnet >> >> >> __________ Information from ESET Smart Security, version of virus signature >> database 5555 (20101022) __________ >> >> The message was checked by ESET Smart Security. >> >> http://www.eset.com >> >> >> >> __________ Information from ESET Smart Security, version of virus signature >> database 5555 (20101022) __________ >> >> The message was checked by ESET Smart Security. >> >> http://www.eset.com >> >> >> _______________________________________________ >> Orcnet mailing list >> Orcnet at eeconsult.org >> http://eeconsult.org/mailman/listinfo/orcnet >> > > Brian Conley, PE > Circuitsville Engineering LLC > www.circuitsvilleeng.com > Voice - 503-530-6520 > FAX - 503-574-2066 > bconley at circuitsvilleeng.com > > _______________________________________________ > Orcnet mailing list > Orcnet at eeconsult.org > http://eeconsult.org/mailman/listinfo/orcnet > > -- Tim Wescott Wescott Design Services Voice: 503-631-7815 Cell: 503-349-8432 http://www.wescottdesign.com