I have some 555 ICs and need to find a schematic for a circuit that will be on for 5 minutes and off for 5 minutes. Actually between 3-5 minutes is fine however the amount of time circuit is on should be very close if not the same as time off.
this will run a relay on and off I have the relay and the 555 probably most if not all the other components however when I google 5 minute circuit I did not find anything using a 555 IC any help is appreciated.
For a number of reasons I doubt you will get a 3 to 5 min symmetrical (50% duty cycle) from a 555 timer. If you read the data sheet it will tell you what a 555 timer can and cannot do. The formulas are provided for calculating On/Off timing. I would also suggest you **broken link removed**. To get the timing you want you would need what would be a perfect capacitor having zero leakage and that isn't going to happen. That is but one reason for the problems. There are also plenty of 555 timer calculators online that will do the math calculations for you. Anyway, I don't see you getting what you want in the 3 to 5 min range with a 555 timer. You may get one circuit to work, I just don't see it as an easy task for a 555.
While I have no clue what your project is there are Astable timing circuits that will work. That is what you want be it a 555 or other, it's called an Astable timing circuit and for your application with a 50% duty cycle. There are also a variety of "Repeat Cycle Timer Relays" as off the shelf solutions. A Google of Repeat Cycle Timer Relay will bring up dozens of hits.
Your extremely simple circuit is missing diodes at the output of the 555 to protect against destruction from the inductance of the relay coil causing a very high voltage spike when it turns off.
Signetics invented the NE555 then Philips bought Signetics. The Philips applications note for the NE555 shows the important protection diodes.
Your circuit is also missing supply bypass capacitors of 0.1uF parallel with at least 1uF as mentioned in the datasheet for the LM555.