[time-nuts] Power supply for 'Bay FE-5680A?

[Chris Albertson]

On Thu, Jan 5, 2012 at 4:55 PM, Ian Bobbitt <time-nuts at custodes.info> wrote:

> Can anyone recommend how to power one of the latest crop of 2nd hand
> FE-5680As? Are they the ones that need only 15-18vdc, or do they need the
> 5v line as well?
>
>
The latest batch of $40 units require +5V too.  I measure about 80mA on the
5V  suply.  So you could make 5V with an LM7805 if you have 15 volts
nearby.    The 7805 would only burn 800mW.

the 15V supply needs a solid 1.8A for about five minutes. and then drops to
less than 1/2 of that.    The spec says 300mV or ripple is alowed

I'd using a lab type bench supply now but my plan is to use a laptop type
supply that has a large coax type DC plug.   I've seen some that
as labeled as 15V, 6A    for $11 (shipped) on eBay  Older Tosiba laptops
used 15V

I don't really like switching supplies like this so I'm thinking of getting
a 24V laptop supply and re-regulating it with a 7815 and a pass transisor
so that the FE5680 sees a linier supply.  In the end I bet I do both.

Real soon now, like tomorrow I'm going to need a supply for a Thunderbolt
too.   I'll likely build two of those as well.



Chris Albertson
Redondo Beach, California