Nicolas Alvarez wrote:
> Tom Austin <taustin> wrote:
>> One think to keep in mind, you are best off not trying to drive the LED
>> directly from the chip.  Some chips can do it, but most cannot.  Lots of
>> times you need to put a *switch* that the gate switches.
> 
> I have an electronics kit, with CMOS ICs, LEDs, and AA batteries adding up
> to 9v. I have always connected LEDs directly at the output of gates. With a
> resistor, of course (3.3k ohm), I mean without any kind of switch.
> 


With TTL you should be able to drive a LED from the outputs.
With CMOS you better check to be sure.

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