Re: Where to start on Missile Command PCB repair

I find Digikey tends to run a little higher on some things. I like Newark,
Jameco, and occasionally Mouser.

Also you can use Findchips.com they exclude Jameco but it will give you a
good idea on pricing.

On Fri, Nov 1, 2013 at 8:27 AM, Grant Thienemann <grant.thienemann@gmail.com
> wrote:

> Hey Kevin,
>
> Thank you for the information! I've never used Jameco before, I've always
> used digikey.
>
> -Grant
>
>
> On Fri, Nov 1, 2013 at 9:26 AM, Kevin Moore <talon.k@gmail.com> wrote:
>
>> 74S00
>>
>> http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_676959_-1
>>
>>
>>
>> On Fri, Nov 1, 2013 at 8:24 AM, Grant Thienemann <
>> grant.thienemann@gmail.com> wrote:
>>
>>> Ok lets say you have a 74S00, which is for speed, can you replace that
>>> with a 74F00?
>>>
>>>
>>> On Fri, Nov 1, 2013 at 9:17 AM, Grant Thienemann <
>>> grant.thienemann@gmail.com> wrote:
>>>
>>>> Hey Rodger,
>>>>
>>>> Thank you for the information. I'm looking at wikipedia now about the
>>>> 74XX series chips, which would be the default standard when looking to
>>>> replace a 7400, or 7404 etc, would that be HTC?
>>>>
>>>> Thanks
>>>> Grant
>>>>
>>>>
>>>> On Fri, Nov 1, 2013 at 9:08 AM, Rodger Boots <rlboots2@gmail.com>wrote:
>>>>
>>>>> Close. HCT is closer. Either should work.
>>>>> On Nov 1, 2013 7:52 AM, "Grant Thienemann" <grant.thienemann@gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Ok not to keep getting off topic, but as this is related to the
>>>>>> Missile Command repair, I'm going to ask. When I look for 74191 I can't
>>>>>> find anything on Digikey, etc, but when I search for 74HC191 it comes up,
>>>>>> is that the same thing?
>>>>>>
>>>>>>
>>>>>> On Fri, Nov 1, 2013 at 8:42 AM, <solarfox@triluminary.net> wrote:
>>>>>>
>>>>>>> On Fri, 1 Nov 2013 00:35:07 -0400, you wrote:
>>>>>>>
>>>>>>> >So I can generally replace a 7404 with a 74LS04 without any
>>>>>>> problems?
>>>>>>>
>>>>>>> *Normally*, yes, but there *are* cases where you can run into
>>>>>>> problems. The
>>>>>>> switching speed of 74LS-series parts isn't *quite* identical to
>>>>>>> standard
>>>>>>> 7400-series; the propagation delays of a 7404 vs. a 74LS04, for
>>>>>>> example:
>>>>>>>
>>>>>>> -------- 7404 -------- ------- 74LS04 -------
>>>>>>> tPLH 12ns (typ) 22ns (max) 9ns (typ) 15ns (max)
>>>>>>> tPHL 8ns (typ) 15ns (max) 10ns (typ) 15ns (max)
>>>>>>>
>>>>>>> (Source: a very dog-eared and well-used copy of "The TTL Data Book,
>>>>>>> vol.2",
>>>>>>> Texas Instruments, 1985)
>>>>>>>
>>>>>>> The difference is, admittedly, pretty small, but it can add up when
>>>>>>> you've
>>>>>>> got signals flowing through a bunch of different gates, or when
>>>>>>> you've got
>>>>>>> a more complex chip (such as the 74191). So, depending on the
>>>>>>> circuit in
>>>>>>> question, there's a small (but non-zero) chance that you *could* end
>>>>>>> up
>>>>>>> with a "race" condition by swapping a 74LS part into a circuit full
>>>>>>> of
>>>>>>> 7400-series chips.
>>>>>>>
>>>>>>> --------------------------------------------------------------------------
>>>>>>> "I thought I told you to look after him!"
>>>>>>>
>>>>>>> "He'll be all right; he's a Time Lord."
>>>>>>>
>>>>>>> "That's just what they're _called_; it doesn't mean he actually
>>>>>>> knows what
>>>>>>> he's _doing!_"
>>>>>>>
>>>>>>> --------------------------------------------------------------------------
>>>>>>> solarfox@triluminary.net (Gary
>>>>>>> Akins jr.)
>>>>>>>
>>>>>>> --------------------------------------------------------------------------
>>>>>>>
>>>>>>>
>>>>>>> ---------------------------------------------------------------------------
>>>>>>> ** Unsubscribe, subscribe, or view the archives at
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>>>>>>> ** Please direct other questions, comments, or problems to
>>>>>>> chris@westnet.com
>>>>>>>
>>>>>>
>>>>>>
>>>>
>>>
>>
>

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Received on Fri Nov 1 09:31:08 2013