[time-nuts] Thunderbolt Supply

[Bob Camp]

Hi

I have so many of them that I run them off big lab grade linear supplies. 
That's not to good for a single unit.

The neatest way is to run some low drop out linear regulators off of a 
switcher. That way you get it all. The tolerances on the supplies are such 
that an LDO with a hundred mv dropout works with a +/- 12 volt +5 volt 
switcher.

Bob


-----Original Message----- 
From: Larry McDavid
Sent: Thursday, February 10, 2011 6:46 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Thunderbolt Supply

Certainly, I'd prefer a linear 3-output supply. But, I've not found a
suitable one yet, in linear or switching. TAPR offered one in the past
but has no more. So, I'm asking for recommendations and where to get one.

Larry


On 2/10/2011 3:32 PM, J. L. Trantham wrote:
> I favor a linear regulated supply rather than a switching supply.  I had a
> TBolt die while connected to a switching supply in an environment where
> there were frequent power outages.
...
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Larry McDavid
...
> 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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