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

John Howell j at howell61.f9.co.uk
Tue Dec 20 12:18:45 EST 2011


Agreed 340mA seems too high, mine takes 87mA. There has been much
comment on [time_nuts] about the temperature of these units varying from
'let 'em get hot' to 'must heatsink'.

In my experience items that require a heatsink have a milled flat surface
to mount to a sink, not a thin case that would only touch in places.
Furthermore I didn't think fiberglass circuit board was famous for its heat
conducting properties. No sign of any heat transfer compound either. So
do I conclude they need a bit of cooling?

I agree with you Pete and would really like to know what the  makers say
about all this!

Best wishes,

John.



On 20 Dec 2011, at 16:22, Peter Bell wrote:

> 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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