alternate led flasher ckt

[tr1]

could someone direct me to a 555 timer diagram that has R & C values so I can so Ican build a cross buck for my layout your help is grately appreciated,tr1.

 

[CocaCola]

Have you bothered Googling? I 100% guarantee you there are numerous 555 timer calculators out there all you need to do is a Google search...

Or you could work the equation found in the datasheet...

 

[tr1]

thankyou coca cola tr1.