Re: VECTOR: Probably a stupid question...

-----Original Message-----
From: "Paul Maddern" <[email protected]>
To: <[email protected]>
Date: Sat, 7 Aug 2004 18:51:58 +0100
Subject: VECTOR: Probably a stupid question...

> Picked up a non-working Star Wars the other day, have already found a faulty
> inverter at 1N but suspect there's more faulty parts to be found!
> 
>  
> 
> My question is this.  can I replace the 74S04N at 1N with a 74LS04 or a
> 7404N?  Normally I can find a matching part on my parts pile but I can't
> find one of these anywhere!  I'm suspecting the answer is no as I'm assuming
> the S to mean it's fast (?)
> 
no you cant,

the speeds go like this:

74xx - original and slow
74LSxx - low power and faster
74Sxx - faster still
74Fxx - the fastest.

so you can use a 74F04 if you have one.

HC and HCT are something else again, you can use HCT instead of LS in most cases - but not allways.