On the 555 Timer Schematics I found I need help deciding what transistors to use to build it?
This schematic has the details on what values of resistors to use but not what transistors they are:
Which ones should I use?
same thing with this one:
This one seems pretty promising since it does list what transistors to use:
and I don't know this one is hard for me to understand:
Which one do you think is best or what transistors could I use in either of the first 2?
Is the last one actually a 555 timer or is it something else?