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 > <c...@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" <r...@sonic.net> >>> Sent: Tuesday, December 20, 2011 1:10 PM >>> To: "Discussion of precise time and frequency measurement" >>> <time-nuts@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, gandal...@aol.com wrote: >>>>> >>>>> In a message dated 19/12/2011 22:27:22 GMT Standard Time, c...@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 >>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> >> -- >> Chuck Forsberg WA7KGX N2469R c...@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 >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.