Cgs synth

EVERYTHING has a limited shelf life, the old stuff included. I get bulk
resistor lots cheap on occasion because the masking tape they use for the
automatic feeders has gone off. I also have other parts where the leads have
become unsolderable through oxidation. Just twist the lead in a bit of fine
grit sand paper or scrape it with a knife.

Ken

>I was under the impression that the RoHS resistors had a limited
>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
>>
>>
>>
>>
>>
>>
>>
>
>
>
>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/>