I am trying to control 3 bridge rectifiers with 3 seperate inputs of 120vac to control 3 colors on RGB rope light which operate on 120vdc with + neutral. The input comes from a Light-O-Rama controller which is controlled by my PC. My att circuit works OK on control of red & grn but when I use channel 3 for blue all 3 colors come on. The diode that I added (see note 1) allows red & grn channels to operate normally. Without this diode all colors come on tegether no matter which channel I use. I'm sure the good Sgt Wookie or many of you can solve this problem in 3 minutes. I hope so as I'm stumped! WaterBill PS I apologise for my schematic as I don't know how to draw this on computer so I had to take picture and send it on as attachment.