I have a thermal camera whose external shutter doesn't close when commanded to by the camera. I think it is a current issue. Something is fried or worn out within the camera's electronics. The shutter works fine as I can get it to close by applying Vcc to the correct pin on the shutter. When the camera commands pin A to go high, it goes high, but all that happens is there is a very high pitched whine heard from the camera and the shutter never closes. Vcc is 3v, and when A goes high it is also 3v. How would I make it so that when A goes high, a switch is closed connecting Vcc to A?