Invisible wrote:
>>> I have an electronics kit with TTL in it. (A 7400LS, no less.) All 
>>> the diagrams drive the LEDs directly from it.
>>>
>>
>> That's TTL - it can source current, i.e. drive a LED
>> CMOS usually cannot source as much current.
> 
> Well, since TTL is what I'm using, TTL is what I'll worry about.


In the logic sense, CMOS and TTL are basically the same.  They even have 
the same 7400 series part numbers that are pin-pin compatible - just 
take note that hooking CMOS chips to TTL chips can be a bit tricky.

Otherwise, the TTL Cookbook is the cheaper one ;-)



Tom

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