Hi,
I'm using a 555timer to drive my traffic light circuit.The task is to produce a circuit that sends a pulse every second, and then alter it so it sends a pulse every 10 seconds.
I know that I need to use the formula 1=1.45/(RA+2RB)*C. The values I used to find RB were: 1=1.45/(1k+2RB)*10micro. This resulted in rb= 72k. How ever this is all well and good when simiulating the circuit, but I understand I need to use prefered values as close to one pulse a second as I can.
How can I work out what prefered values I can stick too? Or is there a table showing the avaliable values to use?
Many thanks
Matt Seymour
I'm using a 555timer to drive my traffic light circuit.The task is to produce a circuit that sends a pulse every second, and then alter it so it sends a pulse every 10 seconds.
I know that I need to use the formula 1=1.45/(RA+2RB)*C. The values I used to find RB were: 1=1.45/(1k+2RB)*10micro. This resulted in rb= 72k. How ever this is all well and good when simiulating the circuit, but I understand I need to use prefered values as close to one pulse a second as I can.
How can I work out what prefered values I can stick too? Or is there a table showing the avaliable values to use?
Many thanks
Matt Seymour