LED Flash Testing

I was able to do some more testing with the LED flash using a photodiode to test the rise and fall times.

Jank setup.

The BPW34 photodiode is setup with a simple transimpedance amplifier (10K resistor and a 22 pF capacitor in parallel to form low pass). With this, we can see the pulses go through the LED. The rise and fall times appear quite fast, although I haven't fully quantified this.

Pulses.

With 22 pF capacitor.

Without capacitor.

Measuring the voltage across the 0.02 ohm current sense resistor, I get about 75 mV, which means 3.75 A is flowing through the LEDs. I will need to test what happens if add another LED in series, then another string in parallel.

Small note:
Moving the LED slightly removed even more ringing?: I just realized the opamp was hitting the rail. doh.

Clean.