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

shalimr9 at gmail.com shalimr9 at gmail.com
Thu Jan 5 21:33:54 EST 2012

Most laptop supplies operate around 19 or 20 volts. Its a good place to start if you want to get 15V through a linear regulator.

I have used Nintendo Wii supplies for 12V applications that require less than 3.5A. Chinese clones of those can be bought on eBay for less than $10 with shipping.

Didier KO4BB

Sent from my BlackBerry Wireless thingy while I do other things...

-----Original Message-----
From: Chris Albertson <albertson.chris at gmail.com>
Sender: time-nuts-bounces at febo.com
Date: Thu, 5 Jan 2012 18:18:04 
To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Power supply for 'Bay FE-5680A?

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
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