Cold spray, where do you buy?
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From: Joerg on 11 Apr 2010 12:22 whygee wrote: > Joerg wrote: >> I always wondered why FPGA don't have a feature to program an on-chip >> temperature sensor onto one pin, or at least a diode path. uC often >> have that, for example the MSP430 series. > The Actel Fusion family can do pretty temperature measurements, > but they are ... a bit expensive. > Maybe a ring oscillator in the FPGA fabric, > with the output frequency compared to a stable > external oscillator, can help ? > Sure, but then you have to measure frequency and, for some applications, you've just created another EMI nightmare. A simple diode path is all that's needed. In just about any chip design review I suggest this because the feature is essentially free. What follows is usually a moment of silence followed by someone saying "Oh yeah, let's do that". -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 11 Apr 2010 12:25 Spehro Pefhany wrote: > On Fri, 09 Apr 2010 09:58:41 -0700, the renowned John Larkin > <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >> We use Chemtronics Freez-It and some sort of duster spray. Neither >> tastes or smells bad. Maybe some people are putting nasties in theirs >> to discourage kids from snorting the stuff. >> >> John > > Exactly right. The Perfect Data duster I have uses the same > propellant, but doesn't have the nasty. It does leave a quite > noticable residue, so it might affect analog circuits. > > http://www.3m.com/us/office/advisory/3Mdustremoverfaqs.html > > Bittering Agent > That's what my client described. He said it's sort of like the "bitter apple" stuff that you put on things that your dog wants to chew but isn't supposed to. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 11 Apr 2010 12:26 John Larkin wrote: > On Sun, 11 Apr 2010 08:46:02 -0700 (PDT), MooseFET > <kensmith(a)rahul.net> wrote: > >> On Apr 8, 2:19 pm, Joerg <inva...(a)invalid.invalid> wrote: >>> Gents, >>> >>> Running low on cold spray. Digikey doesn't sell it anymore, maybe >>> because of shipment safety rules and regs. RadioShack is also dry. >>> >>> Where can one get that stuff locally? >> Slightly off topic but interesting if you are doing a lot of local >> cooling: >> http://www.exair.com/en-US/Primary%20Navigation/Products/Vortex%20Tubes%20and%20Spot%20Cooling/Pages/Vortex%20Tubes%20and%20Spot%20Cooling%20Home.aspx >> >> > > We tried a vortex tube and were disappointed. Not much cooling and > *very* noisy. > Would it be enough to disgnose thermal effects in a chip? Then we'd just have to wait until Harborfreight has it :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jim Thompson on 11 Apr 2010 12:45 On Sun, 11 Apr 2010 12:21:11 -0400, Spehro Pefhany <speffSNIP(a)interlogDOTyou.knowwhat> wrote: >On Sun, 11 Apr 2010 09:05:49 -0700, the renowned John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Sun, 11 Apr 2010 08:46:02 -0700 (PDT), MooseFET >><kensmith(a)rahul.net> wrote: >> >>>On Apr 8, 2:19�pm, Joerg <inva...(a)invalid.invalid> wrote: >>>> Gents, >>>> >>>> Running low on cold spray. Digikey doesn't sell it anymore, maybe >>>> because of shipment safety rules and regs. RadioShack is also dry. >>>> >>>> Where can one get that stuff locally? >>> >>>Slightly off topic but interesting if you are doing a lot of local >>>cooling: >>>http://www.exair.com/en-US/Primary%20Navigation/Products/Vortex%20Tubes%20and%20Spot%20Cooling/Pages/Vortex%20Tubes%20and%20Spot%20Cooling%20Home.aspx >>> >>> >> >>We tried a vortex tube and were disappointed. Not much cooling and >>*very* noisy. >> >>John > >I've got a commercial one that I was just (in the last 30 seconds!) >playing with. It has a sort of muffler on the hot air output port, but >is still pretty noisy and uses a lot of air volume (but I was >expecting that). I think I might have a real application for it (first >time since finding Ranque-Hilsh (actually they only credited the >latter) in an old Amateur Scientist column decades ago)- but it's >oddball in that the air is there and comes almost for free. > >http://www.visi.com/~darus/hilsch/ > > >Best regards, >Spehro Pefhany So? If you have a small compressor adjacent to your lab, just build a Hilsch tube? ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy
From: Jim Thompson on 11 Apr 2010 12:57
On Sun, 11 Apr 2010 09:22:49 -0700, Joerg <invalid(a)invalid.invalid> wrote: >whygee wrote: >> Joerg wrote: >>> I always wondered why FPGA don't have a feature to program an on-chip >>> temperature sensor onto one pin, or at least a diode path. uC often >>> have that, for example the MSP430 series. >> The Actel Fusion family can do pretty temperature measurements, >> but they are ... a bit expensive. >> Maybe a ring oscillator in the FPGA fabric, >> with the output frequency compared to a stable >> external oscillator, can help ? >> > >Sure, but then you have to measure frequency and, for some applications, >you've just created another EMI nightmare. A simple diode path is all >that's needed. In just about any chip design review I suggest this >because the feature is essentially free. What follows is usually a >moment of silence followed by someone saying "Oh yeah, let's do that". MANY years ago I did a circuit for SGI (nee Cray), Chippewa Falls (*), WI, that could synchronize multiple chips on a board using a DLL (delay-lock-loop). (*) Nice town for German food :-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy |