[time-nuts] Ebay FE-5680A Rb I see the price has gone up for these

Peter Bell bell.peter at gmail.com
Tue Dec 20 11:22:57 EST 2011


340mA seems really high - all the ones I've seen take about 90mA - and
I would strongly recommend putting in on a heatsink, or at least
bolting it directly to the chassis.  In my experience, they don't
actually malfunction when operated without one, but the housing gets
very hot (and, presumably, the insides get hotter still) - after 24h
running sitting on a foam mouse mat open to the air, the case hit
about 59c - I can't help thinking that isn't going to be good for the
long-term health of the unit.

Regards,

Pete


On Wed, Dec 21, 2011 at 12:03 AM, Chuck Forsberg WA7KGX N2469R
<caf at omen.com> wrote:
> Mine requires the 5 volt supply at 340 ma.
>
> Are there nay manufacturer's instructions about mounting, ventilating,
> or heat sinking these units?
>
> My current thinking is to mount it on standoffs on the back of the chassis
> that houses my Thunderbolt.
>
> Perhaps I should place it where it can warm up Princess.
> (Notice the magnet on top of the oscillator.)
>
>
> On 12/20/2011 07:13 AM, Roy Phillips wrote:
>>
>>
>>
>> --------------------------------------------------
>> From: "Rex" <rexa at sonic.net>
>> Sent: Tuesday, December 20, 2011 1:10 PM
>> To: "Discussion of precise time and frequency measurement"
>> <time-nuts at febo.com>
>> Subject: Re: [time-nuts] Ebay FE-5680A Rb I see the price has gone up for
>> these
>>
>>> FWIW. I just hapened on this power supply in an ad. You might find a
>>> fixed voltage one somewhere cheaper, but the price seemed ok, so here it is
>>> for consideration...
>>> http://www.mpja.com/email/12-13-11.asp?r=284759&s=2
>>>
>>> Still need the 5 V somehow, so not a complete solution for the 5680A.
>>>
>>>
>>> On 12/19/2011 3:06 PM, GandalfG8 at aol.com wrote:
>>>>
>>>> In a message dated 19/12/2011 22:27:22 GMT Standard Time, caf at omen.com
>>>> writes:
>>>>
>>>> This  thing requires plenty of current to get started.
>>>> My Tek CPS250 1.2 amp  output (A+B parallel) only gets 7.5 volts.
>>>> Now to scrounge something a bit  bigger.
>>>> ---------------------
>>>> The 15 volts to pin 1 starts off needing to supply around 1.7 Amps,
>>>> eventually falling to somewhere between 700 and 800 mA.
>>>>
>>>> Pin 4 always draws around 85 to 90 mA from its 5 volt supply.
>>>>
>>>> regards
>>>>
>>>> Nigel
>>>> GM8PZR
>>>>
>>>
>>> Nigel
>>
>>   I trust that you are aware that some models of the FE-5680A only require
>> the 15 volt/1.7Amp. supply.   In fact connecting a 5 volt supply to the
>> units that are programmable can cause damage !
>>   Roy
>>
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>>
>>
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>
> --
> Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
> Developer of Industrial ZMODEM(Tm) for Embedded Applications
>  Omen Technology Inc      "The High Reliability Software"
> 10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430
>
>
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