I have never used photo diode / transistors before.
I have a OP906 photo transistor with a bpv11f photo diode. My transistor circuit is based on this:
Except I am using a 1K resistor. My supply is 3.3V. I know the transistor circuit is working because I use a remote and I can see transitions at A3.
My photo diode circuit is a follows. If I am reading the datasheet correctly my forward voltage is 1.2V with an If of 1ma.
If I do my math correctly that means a 2K current limiter. I am using 2.2k since that is what I have on hand.
I have the LED in very close proximity to the transistor but I am not using a lens. Doesn't matter if I interrupt the light path or disconnect the LED, I see no transition in voltage at A3.
Do I need a lens?
Am I using right diode?
What else could be wrong?
How do I know if the LED is actually "lighting"?
I have a OP906 photo transistor with a bpv11f photo diode. My transistor circuit is based on this:
Except I am using a 1K resistor. My supply is 3.3V. I know the transistor circuit is working because I use a remote and I can see transitions at A3.
My photo diode circuit is a follows. If I am reading the datasheet correctly my forward voltage is 1.2V with an If of 1ma.
If I do my math correctly that means a 2K current limiter. I am using 2.2k since that is what I have on hand.
I have the LED in very close proximity to the transistor but I am not using a lens. Doesn't matter if I interrupt the light path or disconnect the LED, I see no transition in voltage at A3.
Do I need a lens?
Am I using right diode?
What else could be wrong?
How do I know if the LED is actually "lighting"?