NE555 vs U1555 in this schem..

[cedric]

from colin's fine site.
i've got an NE555 laying around and was wondering if i could put it in place of the U1555 ?

- ced

[ExpAnonColin]

That "U1555" is a NE555.  The "U1" means that it's semiconductor #1, sort of like "R1" or "C4" for resistors and capacitors.  555s are generic so there are a lot of people that make them, your NE one is exactly what the schematic works for.

Keep in mind this is a square wave tone generator, a 555 acting as an astable.  If you want to delve in to it more, I think there's a file called "Basic 555 astable theory" on the site, which will also help explain the ins and outs of the chip.

-Colin

[cedric]

hey thanks colin. always helpful you are.

i'll look for the basic 555 pinout file. but for now i'm just interested in making a simple square wave generator for a friend of mine (he wants a pitch controlled thing-ie... i don't now - i'll see if it works).

[ExpAnonColin]

hey thanks colin. always helpful you are.

i'll look for the basic 555 pinout file. but for now i'm just interested in making a simple square wave generator for a friend of mine (he wants a pitch controlled thing-ie... i don't now - i'll see if it works).

The 555 is excellent for that, if he wants a square wave.  If you want a triangle, try the simple dual op amp LFO I drew up.  It's in there.


-Colin