[time-nuts] Power supply for Thunderbolt

Ken Winterling wa2lbi at frontiernet.net
Mon Apr 21 07:24:06 EDT 2008


I use a Mean Well. Model: T-30B with my Thunderbolt.  See
http://www.meanwell.com/search/T-30 for details.  It is about the same
dimensions (slightly higher) as the GPSDO.  I got mine from  Aibin,
VA3GUO, and it was only slightly more expensive than the unit you
referenced on Ebay.  Contact him through Ebay.  You may be able to
source it elsewhere but I bought mine at the same time I bought the

I have no connection to Aibin other than as a satisfied customer.  He
is easy to work with.


On Mon, Apr 21, 2008 at 4:40 AM, David C. Partridge
<david.partridge at dsl.pipex.com> wrote:
> I'm in the process of buying a Thunderbolt, and will need to provide it with
>  some volts.
>  I sat down over the weekend to design a linear supply for it.  Initially
>  things looked OK using a 12-0-12 transformer, and a few IC voltage
>  regulators, but then I did some worst case design and dissipation analysis,
>  and found that I needed to use a 15-0-15 transformer to allow for a -10%
>  mains variation, and add pass transistors and lots of heat sinking to all
>  the regulators to allow for a +10% mains variation.
>  Add to that transformer regulation issues (over-size transformer), the time
>  to design the PCB and the cost of getting it made, and things started to
>  look expensive :-(.
>  I can probably source a linear supply on eBay, but these are typically
>  pretty large and heavy.  For example: eBay item number 330201077319
>  So is it reasonable to use an SMPS, and add additional filtering to the
>  output?  Typically these talk in terms on 150mV ripple & noise which I need
>  to reduce by a factor of ten or better.
>  If you have been there, done that, I'd be interested to hear what you did.
>  Thanks
>  Dave Partridge

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