I have a variable lab power supply. How do I test pinout exactly?I have few ways to guess what an unknown diode is capable of:
What is the package type of the diode
Markings on the diode
What equipment the diode came from
Use a powersupply limited to 4V/10mA to find the pinout
Measure the forward voltage at 20mA to get a check on the impedance (don't the the diode heat up)
Carefully adjust the current to its lasing threshold and take note of what that current is (don't the the diode heat up)
Measure forward voltage again at threshold (don't the the diode heat up)
Note the emitted color/wavelength of the diode
With this basic information one can guess what a safe operating current might be for the diode.
How fast will I kill it, what sort of draw should I look for in terms of voltage and amperage. I have 47 of theseBy trial and error. You will get a faint glow from the diode when you find the correct pins. If it's IR then you need to look though a camera to see it. It is unlikely to lase or be dangerous at 10mA, but it should produce light.