Hi, I need a way of making a switch that will turn on and off an LED with a phototransister as a sensor input. The problem is that the input must be held as the phototransister will change the state when a finger isn't covering the sensor. The switch has one input and needs to behave like a wall switch in that the output to the light is inverted or seems that way (there is an up/down motion to toggle). Is there an IC that can do the job or using a flipflop with feedback. Regards, Anoop