I have setup a Power supply unit(PSU) to supply power to MCU/Bluetooth module HC05 to control 3/4 NOS output operate at 230V(fan and resistive load) with MOC And all are in same PCB.
The Power supply unit(PSU) is constructed with voltage dropping x-rated cap/full bridge/zener/elect cap and placed accordingly.
The system is working correctly but few days after its not working. What is being seen that the HC05-led not blinking like earlier. And found that 5v supply not coming at between vcc and GND of BT Module. and the voltage across ZENER is also not at 5Volt which is at 0.8v something like that.
So In this case as per my assumption the problems is of Power supply unit and if my assumption is correct
1)what component/s may be the defected.
2)how do i prevent this type of problems further
3) why its getting like this.
4) is there any any problems like PCB's track width problems which need to be in more width. T30 is for all except Triac's MT1-MT2 to HOT 230v is at T50.
So what will be permanent solution..