infrared led

  1. G

    Laser sensor for measuring velocity of very fast moving projectile

    I am looking for laser sensor to measure velocity of fast moving bullet/projectile traveling through barrel. I have a bullet of 5mm length and it would cut the laser for just 5- 20 microseconds. The sensor need to be fast enough to give trigger to oscilloscope with this kind of small intervals...
  2. A

    How to power on infrared LED?

    I'm doing the project of hand vein visualizer but the vein images result are not appear clearly so I bought the IR LED transmitter and receiver. I tried to power on the LEDs. I don't know why they didn't work but they not light up. Can anyone help or share any circuit for me to try?
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