[time-nuts] Thunderbolt Supply

J. L. Trantham jltran at att.net
Fri Feb 11 02:20:37 UTC 2011


I use a Heathkit IP-2718.  It only goes to 500 mA on the +12 supply but when
the TBolt is turned on, the current goes off scale for a few minutes, the
voltage drops about a volt or half volt, but then all comes back on scale as
the OCXO warms up.

I think I built one years ago but I found several of these on the 'e' site
for only a few bucks.

However, a power supply for the TBolt should be very easy to build.  My
ultimate plan was to buid a box that included 110 VAC and +12 VDC supply
that would supply all three voltages.  Should be fairly easy to do with a
555 as an oscillator to drive a voltage doubler to make the -12 VDC supply
capable of low current.

Joe



-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Larry McDavid
Sent: Thursday, February 10, 2011 5:46 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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