I was under the impression that the RoHS resistors had a limited
shelf life - is that incorrect?
-Chris
shelf life - is that incorrect?
-Chris
On Jan 19, 2006, at 7:01 PM, Richard Brewster wrote:
> I buy resistors from Mouser. http://www.mouser.com
>
> I always buy the 1% metal film, the 271- series, (271-10K-RC for
> 10K is
> the new number for RoHS non-leaded). These cost 9 cents each, but 2
> cents each for 200. Figure it out. You can buy 50 for $4.50 or
> 200 for
> $4.00. If you do any serious DIY electronics you will be glad you
> bought 200 and then you won't say, gee I only have two 39K
> resistors left.
>
>
> -Richard Brewster
>
> http://www.pugix.com
>
> sasami@... wrote:
>
>> Often these letters refer to the type of packaging the chip comes in.
>> Sometimes it makes no difference (except maybe to the price) -
>> plastic or
>> ceramic for example. Some times it does make a difference - DIP or
>> surface
>> mount for example. The datasheet should give the details, even if the
>> catalog doesn't.
>>
>> I don't specify this because these can vary brand to brand. If I
>> say TL071,
>> what I am saying is "any brand or package of TL071 that will fit
>> on the board".
>>
>> With electros, the voltage on it needs to be equal to, or higher,
>> than the
>> one I give.
>>
>> Resistors need to be at least 1/4W (the standard for small
>> resistors),
>> though higher ratings that will physically fit are okay. As for
>> resistors,
>> 5% tollerance is assumed if no value is given, though using 2% or 1%
>> resistors is fine. In fact, the preferred resistor type is metal
>> film 1%,
>> but they do cost a little more.
>>
>> Ken
>>
>>
>>
>>> When im buying components to build my modules, does it matter
>>> which IC
>>> I buy? many of them have letters listed on the end of them that are
>>> not listed on the parts list. Say I need a tl071, do I get a
>>> tl071SM
>>> CD ACM ACP, etc.... Even simple parts like resistors and caps
>>> give me
>>> many options. I know this is some basic electronic stuff, and I
>>> should know it by now, but Im learning.
>>> (this is why I ordered my first few modules as kits from elby.. but
>>> Ive already picked out a few more that I want, and would like to get
>>> only the PCB's this time)
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> The CGS Modular Synth home page: http://www.cgs.synth.net/
>>>
>>> Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>> _____________________________________________________________________
>> __
>> Ken Stone sasami@... or sasami@...
>> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
>> Australian Miniature Horses & Ponies <http://www.blaze.net.au/
>> ~sasami/>
>>
>>
>>
>> The CGS Modular Synth home page: http://www.cgs.synth.net/
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
> The CGS Modular Synth home page: http://www.cgs.synth.net/
>
> Yahoo! Groups Links
>
>
>
>
>
>
>