Hi, all, I am repairing a simple micro controller circuit that has a few 12 volt relays, a step down transformer, a smd voltage regulator, a bridge rectifier using 4 diodes a smoothing capacitor and some passives. The circuit does not function at all and after testing voltages I get a stable 5 volts out from the voltage regulator to the pic. The problem is: the voltages in the circuit jump a few milli volts. When I looked at it using a DSO it seemed to be jittering on an off. I think it is the micro controller causing the problem but before I give up I want an opinion. Any assistance would be appreciated.