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Diode

Former Member

Any clues what diode this is, and value

Many Thanksimage

  • 0

    it is not possible to say, but if you have saw waveform, like +-10V, connect to diode via 1k resistor, diode voltage to X input and ramp voltage on resistor to Y input of oscilloscope, and you will get VI curve. and by that you can tel if it normal diode, zener, or Schottky

     

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    Note since you have single ground on your scope, you have to do math to get voltage on R1 resistor by subtracting diode voltage from resistor voltage. ir if you have TPS2024 you can do it directly like in picture

  • 0

    It's (99.9% likely) just 1N4148 which is a super-popular diode. (Fat yellow, then brown then yellow then gray stripes).

    Your replacement is likely to come with wire legs, and possibly uncolored except for one band which I think is to be positioned where the fat band is.

    If your current device works, that's easy to test with a multimeter.

  • 0 in reply to shabaz

    Yes this one it have wire legs before but it pop of the circuit board after being in a flood.
    Trying to rebuilt the cicuit board. I have some 1N4148 so I will give it a go. Many thanks

  • 0 in reply to Former Member

    best way to tell what is it, is where you removed it from. sometimes it is obvious

  • 0

    Look up the diode color codes. It's most likely an 1N4348. I'm reading the second colour as orange, not brown. If it's brown, it's a 1N4148.