The eraser on the end of a pencil also works well, if you have contrived
a way to hold the PC board stably. I find tweezers are lamentably prone
to launching SMT parts into low earth orbit, never to be seen again.
Also ... don't sneeze.
73, Pete N4ZR
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On 8/16/2009 7:31 AM, Alex Eban wrote:
> ..soldering them is not so hard. Just get yourself a liquid flux pen- mine
> is from Farnell, as it happens- put a small drop on both ends. Hold the part
> with real fine points tweezers, solder one end with a very small amount of
> solder, then the other end. Revisit the first end and touch up.
> Remember, what's holding SMT parts in place is the solder that has wicked
> under the part, not the blob visible at the end.
> Alex 4Z5KS
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Jim Barber
> Sent: Thursday, August 13, 2009 8:11 PM
> To: Pete Lancashire
> Cc: amps@contesting.com
> Subject: Re: [Amps] Carbon film or metal oxide film resistors for low-power
> RF circuits?
>
> Very interesting responses, thanks.
>
> DigiKey stocks some Stackpole RNC and "RNCS", which Stackpole claims are
> "Ideal replacement for costly Tantalum Nitride resistors" .
>
> I wasn't able to quickly find stock on the Vishay-Dale parts in the
> usual places, but the data sheet looks good.
>
> Now if I could only learn to solder surface-mount components without
> making such a mess.
>
> Thanks and 73,
> Jim, N7CXI
>
> Pete Lancashire wrote:
>
>> Not to push on company over another, I found some of this to be helpful
>>
>> http://www.vishay.com/resistors-discrete/list/product-31025/
>>
>> For those oldtimers, Vishey bought Dale.
>>
>>
>>
>>
>>> Hi Jim,
>>> I'd suggest using mil type RLR or if you realllly want long term
>>> reliabilty use type RNC.
>>>
>>> Either one will last near forever. No comparison to carbon comp or
>>>
> even
>
>>> film.
>>>
>>> 73& Good morning,
>>> Marv WC6W
>>>
>>> http://wc6w.50webs.com/
>>>
>>>
>>> --- On Wed, 8/12/09, Jim Barber<audioguy@charter.net> wrote:
>>>
>>>
>>>> From: Jim Barber<audioguy@charter.net>
>>>> Subject: [Amps] Carbon film or metal oxide film resistors for low-power
>>>> RF circuits?
>>>> To: "AMPS"<amps@contesting.com>
>>>> Date: Wednesday, August 12, 2009, 1:06 PM
>>>> If you wanted a precision RF
>>>> instrument to last a long time without
>>>> significant component drift, would you use carbon film or
>>>> metal oxide
>>>> resistors?
>>>>
>>>> Assumptions:
>>>> (1) Little to no RF power dissipated in the resistors
>>>> themselves
>>>> (2) Frequency less than 60mhz
>>>> (3) There would be room for physically larger 1-watt
>>>> metal-oxide
>>>> (4) Cost isn't an issue (repair quantities, mostly)
>>>>
>>>> Looking for opinions, of course. I find myself replacing
>>>> carbon
>>>> composition units all the time, and was wondering if
>>>> metal-oxide would
>>>> be "better" than carbon-film for these purposes.
>>>>
>>>> Thanks,
>>>> Jim, N7CXI
>>>>
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>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>
>>>>
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>>>
>>>
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