I'm trying to turn on an LED with a dark activated circuit, and I've got a basic circuit working with an LDR, but the LED is barely lighting up. I'm only getting about 3V out in complete darkness.
I have a resistor and the LDR forming a voltage divider on the base of a transistor. I assume my problem is because my voltage divider is too far out of balance; but I'm not totally certain. I do know I'm getting similar results with a 2N2222, a 2N3904, and a TIP120. Right now I have a 100K resistor in with the LDR, and I've tried other values but none seem to really help this problem. I can get the circuit to switch on in more and less light, but it always seems to only put out about 3V.
Anyone else have experience with circuits like this?
I have a resistor and the LDR forming a voltage divider on the base of a transistor. I assume my problem is because my voltage divider is too far out of balance; but I'm not totally certain. I do know I'm getting similar results with a 2N2222, a 2N3904, and a TIP120. Right now I have a 100K resistor in with the LDR, and I've tried other values but none seem to really help this problem. I can get the circuit to switch on in more and less light, but it always seems to only put out about 3V.
Anyone else have experience with circuits like this?