That is basically what I do. Bert Kehren In a message dated 2/11/2011 11:44:56 P.M. Eastern Standard Time, namic...@gmail.com writes:
One approach for the Tbolt is to use a low dropout low noise linear regulator (I used a LT1764 set to 11.5 volts) for the 12 volt input (it is within spec) and a 5V switcher (Recom R-785.0-1.0) for the 5v. For the minus 12v I used a ICL7662, these are rare, so a cmos gate oscillator and diode pump negative generator could be used. I am told the -12V is quite uncritical. The whole lot runs across a 12V lead acid accumulator which delivers about 300mA to run it when the power fails. The battery is floated at 14.0 volts with a linear regulator from a mains transformer power supply. A 20 AH battery gives more than 2 days backup. As the 12Volt is the sensitive input, the linear regulator should keep the noise down. The whole setup is designed to use minimum power. cheers, Neville Michie On 11/02/2011, at 10:16 AM, Larry McDavid wrote: > Greetings! I am a new member of the mail list. I've been using a HP > Z3801A GPS-steered standard but have just acquired a Trimble > Thunderbolt GPS Disciplined Clock. > > I'm seeking a recommendation for a power supply for this > Thunderbolt receiver. There is much discussion about noise from > some switching supplies and the effect on phase noise of the 10 MHz > output. The Thunderbolt manual specifies the following supply and > loads: > > +12 vdc 750 mA > + 5 vdc 400 mA > -12 vdc 10 mA > > This combination is somewhat unusual in that the highest current is > on the 12 volt output rather than the 5 volt output. I'm asking if > list members have a favorite power supply for this unit, why and > where I can obtain one. > > -- > Best wishes, > > Larry McDavid W6FUB > Anaheim, CA (20 miles southeast of Los Angeles, near Disneyland) > > _______________________________________________ > 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.