Sorry I thought the discussion was about the bottom case of the TBolt, not the PCB, being in contact with a larger thermal mass.
jerry -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of ewkeh...@aol.com Sent: Monday, August 27, 2012 10:44 AM To: time-nuts@febo.com Subject: Re: [time-nuts] newbie question Thunderbolt supply There are components and traces. Bert In a message dated 8/27/2012 10:10:45 A.M. Eastern Daylight Time, jster...@att.net writes: Are these thermal pads temp conductive or insulative? If you want heat dissipation why not use the readily available thermal grease used for semiconductor mounting? Cheap and not really messy if applied correctly jerry -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of ewkeh...@aol.com Sent: Monday, August 27, 2012 9:38 AM To: time-nuts@febo.com Subject: Re: [time-nuts] newbie question Thunderbolt supply Thank you. Will look for it here under thermal pad. Bert In a message dated 8/27/2012 8:08:30 A.M. Eastern Daylight Time, azelio.bori...@screen.it writes: Here in Europe Farnell has the 3M thermal pad in sheets (105x150mm)... On Mon, Aug 27, 2012 at 12:48 PM, ew <ewkeh...@aol.com> wrote: > > Chris > Starting with 3.4 W used by the Tbolt my battery version burns 4.4 W. > Using a switcher do generate 7 V 4.8 W and running the 7805 directly > from 14.5 V 6.2.W. I use like you an IC temp sensor, two stage op > amp driving a fan holding the backplate temp constant and total > power goes up to 7.6 W since the oven has to work harder. T bolt, > switchers and all regulators are on the other side of the 3/32" Alu > plate. The AC switcher is > not included in the power numbers. but is also on the plate. Plate > is held > at 40 C. > I am looking for a way to more closely couple the Tbolt circuit > board to the back plate and am looking for the material switchers use > between semiconductor and cooling plate Any one know where I can buy > it in sheet form? > Bert Kehren > > > > > -----Original Message----- > From: Chris Albertson <albertson.ch...@gmail.com> > To: Discussion of precise time and frequency measurement < > time-nuts@febo.com> > Sent: Sun, Aug 26, 2012 12:31 pm > Subject: Re: [time-nuts] newbie question Thunderbolt supply > > > On Sun, Aug 26, 2012 at 3:46 AM, <ewkeh...@aol.com> wrote: > > Having played with several solutions I found the best is a 12 V 1 A > switcher with the output voltage increased to 15 V, check the > capacitors and if necessary replace with 25 V. I laid out a PC > board that has a TC7662A inverter followed by a 79L12. Also on the > board is a 7812 followed by a > 7805. > Putting them in series gives me good thermal distribution. .... > > ne of the advantages of generating waste heat like that is that you > can ut the heat to good use. I build a temperature controlled fan. > It is ery simple a temperature sensor IC connects to an opamp that > drives a ower transistor that drives a 12V fan. > As for the power supply. I used a filter that does not drop any > volts and > can't see any RF on the DC using my old 365 Tek scope or by using a more > ensitive RF power meter. > > hris Albertson > edondo Beach, California > ______________________________________________ > ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > nd follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
