I run mine with a 20V laptop power brick and it runs quite cool, just warm to the touch with a heatsink, resting flat on a table with no forced air flow. Even after a couple of hours, the LPRO was just warm. I have not checked spurs (I expect the switcher to produce some, even though it is FCC approved), but it would be easy to make a power supply filter, and as soon as I get around to it, that will be next on my ToDo list.
The thermistor/fan controller is a good idea, it can't hurt the long term stability to regulate the temperature. I sense another project coming up, as soon as I have finished integrating the Thunderbolt with a distribution amplifier and my GPS Monitor: http://www.ko4bb.com/Timing/Distribution_Amp/ Didier > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Neville Michie > Sent: Monday, January 12, 2009 2:21 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] LPRO-101 Heatsinking > > Hi, > The LPRO is shown to run down to 18 volt supply which reduces > the power dissipation, see the graph in the manual. > Like Mike I put one on to a heatsink and used a tiny > under-run 12V fan to cool it. > I placed a thermistor on the heat sink and controlled the fan > to keep the heat sink to about 37C. > I insulated the assembly so it can handle low temperatures. > It hold this within +or- 0.05 degree, which is a tremendous > assist to the non-ovened XO. > It also reduces the power demand to about 7 or 8 watts. > There is a small burden on the MTBF specs, but in my book > quite acceptable. > When I finish building some more gear I will get the improved > performance data, cheers, Neville Michie > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
