Soft star issue
I built a soft start circuit based on Rod Elliot design this weekend. I have a 1kVA toroidal xfmr, 120 AC lines, and 56mF cap bank.
I used 3 33ohms/35W resistor in parallel to limit the current to 11A at switch on for about 2 sec.
After maybe 10 starts, I heard a pop coming fom the soft start circuit. Next time I started it a louder pop with a flash and some smoke came from one of the three resistors.
I'm not sure yet if the resistor is burnt but I don't really want to leave the circuit like that now. What's wrong?
I built a soft start circuit based on Rod Elliot design this weekend. I have a 1kVA toroidal xfmr, 120 AC lines, and 56mF cap bank.
I used 3 33ohms/35W resistor in parallel to limit the current to 11A at switch on for about 2 sec.
After maybe 10 starts, I heard a pop coming fom the soft start circuit. Next time I started it a louder pop with a flash and some smoke came from one of the three resistors.
I'm not sure yet if the resistor is burnt but I don't really want to leave the circuit like that now. What's wrong?