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)
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