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I think you meant the 555 timer, the 444 was an op-amp.


Thanks, I assumed incorrectly that it was called the 444. It was common in hobby kits and I remembered it had 8 legs. Pretty simple to wire up to a 5V source, potentiometer, a few caps, and an LED to get basic blinking lights.

But what is available today goes way beyond the kits I had when growing up.


He might have meant a 444. You can turn an op amp into a oscillator pretty easily: just drive it with some RC circuit.

See p284 of Horowitz and Hill :-)


Except it wasn't :)

I agree, you can do that, but the description was fairly clearly a 555. Besides that an lm444 is a 14 pin dip and a 555 is 8 pins (see comment by yardie).




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