Hi, I have this circuit that I am using to test an optical read head that uses 9 little solar panels that each give off about .4-.5 volts depending on intensity of the light source. My problem is that I want to hook it up to LEDs that will light when it "sees" a voltage from the solar panel. In my circuit, I have a 9V battery that is hooked up to 9 transistor's collector sides and then the emitters are hooked to the LEDs. The solar cells have their positive side going to the base to switch on the 9V to the LEDs. The problem is that in testing, the transistor doesnt open up til they recieve about .8V so my circuit doesnt work. Does anybody have any recommendations as to what I should use like an OP-AMP or a different type of transistor? Thanks alot.
David
David