I made a circuit using relays to control when to start some motors. Since there were four motors that should be connected, I made four identical circuits.
Testing each individually, they worked. But when you call everyone together, there is a big problem. One of the relays continuously switches the contacts very fast, without me giving any commands. It starts, vibrates for 4s, stops, waits 15 seconds and does it again.
I'm feeding them all with a source made by me that puts out 5v and 12v. I know that it feeds correctly because it is feeding other circuits besides these. Does anyone know what the problem might be?
The power supply im using is shown below:
I'm using a 30V 5A transformer.
All circuits together: