I have made the following circuit:
When power is applied, C1 charges up and the LED lights up. When power is disconnected, the LED gradually dims. It turns off when C1 reaches around 1.5V.
I'm trying to get another LED to turn on when the first LED turns off. So basically, I want a circuit to turn on when the capacitor has below 1.5V:
I am using a SS9014 Transistor (it says something else on the diagram). I'm not too familiar with reading transistor data sheets, so I have no idea of the conditions that make a transistor turn off. Is it a certain voltage or is it a certain amperage that makes it turn on?
If it's a certain amperage, then I could just adjust R2 to make LED2 turn on when C1 is under 1.5V right? What is that amperage?
If it's not amperage that makes Q1 turn on, then it must be voltage. I assume the voltage is less than 1.5V because 1.5V can turn it on. What are my options in this situation? Is there a way (or possible a 4000 series IC?) to reduce the 1.5V from C1 to the minimum voltage that makes the base turn on Q1? If so what is that voltage?
Sorry if my question is confusing. Feel free to ask questions in a comment.