Hi guys I put this circuit together and it works good until you add more then 9 volts to it then one of the leds just kind of dims down while the other just flashes like regular. So at 9volts it flashes side to side but at 12 volts it still flashes but one of the leds just dims downs I am using 500ohm res. with the led's everything else is the same. Can anyone tell me what might be wrong I was thinking that I just have a resistor the wrong value somewhere.
The circuit you linked to I am not sure about. Looks like they have the 555 pin 3 output tied back to your RC timing network for the 555? Take a look at this similar circuit.
My best guess is the circuit you have was incorrectly drawn for the web. Tie the side of your 47K resistor not going to pins 6 & 2 to your power like shown in my link. That should get it working.
Also, per Bychon you may want to place a .01 uF between pin 5 and ground but I would change the other first.
Yeah smart guy. I don't know as much as you so it would be nice to explain to people in detail. The other people explained it to me with clarity and now my project works nice so the mods can close this f they want.
This has the appearance of one of those books you buy when you get three pages in and suddenly the author expects you to know what they're talking about, but you actually bought the book to learn what they're talking about