@Nicfur   Oh my God.. Maybe it's the language barrier. English is not my native language. You obviously don't know what you're doing and we try our best to help you before you hurt yourself or the device I'm sending two versions. The first assumes that there is a potential-free contact of the NO / NC relay on the source (power supply). If so (when you switch PUSH to GND-, the relay should click), the COM and NO terminals will close. Measure whether there is any voltage at the ou