Tube filament regulated supply soft start kit (3) !

This is an assembled kit of a tube filament regulated DC supply circuit with soft-start feature. The soft-start feature can protect the tube from high in-rush current when the filament is at cold start. The circuit consists of one regulated power supply that can provide up to 1.5A of current and filament voltage adjustable from +1.2Vdc to 12.6Vdc. Input voltage is 7.5V to 12V AC. There are two sets of output pads( sharing the same power regulator) on the board to facilitate connecting to two sets of filament.