Can I use an NE555 timer instead of an LM555?

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The prefix is partly determined by the name of the manufacturer.

See the list on this site:
http://en.wikipedia.org/wiki/LM555
Many manufacturers make a version of the 555.

There are various CMOS versions which use different voltages to the LM555 and NE555 so you would have to modify the circuit to use them.

For your query, though, the LM555 and the NE555 are essentially the same.

I see Jaycar and Altronics both carry the NE555. (I'm in Perth).