I have made a DC Led BULB (7 watt) which is working on 12 volts input. By the way its input voltage range is 12-48 volts DC (using BP 1601 regulator ic) Now problem is that when i gave some bulbs to an NGO members. Some of them tried to operate it on 230 volts mains supply.which malfunctioned DC LED driver circuit. Now i want to protect this 12 volt operating circuit from ac mains supply. I tried and failed !!!
I used bridge rectifier to convert ac to dc means 230 AC to 230 DC then i m unable https://electronics.stackexchange.com/editing-helpto step down 230 Volts DC to 12-48 Volts DC.
Any other way to bipass AC input!!!
like over voltage protection,surge protection,over current protection,short circuit protection etc...i want a extra protection which wrong input type protection."MAINS POWER SUPPLY Protection for any DC circuit either it is operation on 3.3 v or 5 v or 12 v input"
:-) Fixed the circuit myself.