Hi All. I am using the 555 timer for a basic circuit. I am using the circuit in the back of the Dick Smith catalogue Can anyone help me with the values of the Cap and resister. The time I want is 2 minute (120sec) +- 10 seconds. I have tried various values, but it is unreliable, and on most occasions stays on for a long time, and I can't wait that long and normally manually reset it. If someone can give me the right values, then I may be able to see if the time problem is somewhere else in the circuit. Thanks in advance for any replies. Rob Melbourne.
- posted
18 years ago