/diy/ - Do It Yourself

>>1138150
Ok, I might have made a slight blunder. Assuming that pic related and your circuit came from those garden solar lights, the right-most transistor will be a PNP, not a NPN, i.e. it requires a negative voltage at the base (the wire perpendicular to the centre line). This doesn't make sense to me because there isn't a voltage at all when the solar panel isn't receiving light, which is when the light is supposed to turn on. Unless PNPs trigger on 0V, which I doubt. Pic related does show a potential current path of from the battery +, into the emitter (why is it called emitter if it absorbs current), out the base, though the resistor, through the PV cell, and into the battery negative, hence potentially triggering the transistor, but your circuit shows none of this. Assuming I didn't mess that up too. I did bumblefuck my way through the circuit diagram and completely guess the BJT polarities and orientations after all.