Hello, Happy Christmas. I have a sony HX100V sony camera. The power adapter/charger (ACL200D) is not functioning properly. The input to the adapter is 230v and the output is 8.4V, 1.7A. the adapter few times fell down and is not charging my camera now. I tested the output voltage and is 4.3v. I opened the charger and there is no physical damage observed. I want to make a substitute for that. I made a small experiment. I have connected a 7809 (without heat sink) to a 12v rail of an ATX. The output is connected to my camera and is charging. I tested this for just 3 seconds. 7809 is heating Of-course it is not damaged. As my camera battery is completely discharged, it is taking more than 1 Amp which makes 7809 to get heated. I have an adjustable flyback converter in my workshop. I can adjust its voltage to 8.4V. I don't remember the current rating (its definitely more than 1.5A). Can I use this to charge my camera? Or do i need any current controlled buck converter?