davood omidvar
Newbie
hello dear friends
I have a circuit board that using VIPER12 for producing 12volt . ( Iwas copied this board from an other board)
but my designed board have some problems:
1-some noisy sounds hear from that
2- viper IC is warm
3-in some assembled boards as just as I plug to 220V VDR and 39 ohm resistor in the AC mains INPUT blows.
I have a circuit board that using VIPER12 for producing 12volt . ( Iwas copied this board from an other board)
but my designed board have some problems:
1-some noisy sounds hear from that
2- viper IC is warm
3-in some assembled boards as just as I plug to 220V VDR and 39 ohm resistor in the AC mains INPUT blows.