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Tom Austin wrote:
> 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.
I have an electronics kit with TTL in it. (A 7400LS, no less.) All the
diagrams drive the LEDs directly from it.
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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