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8V 40mA bi-pin lamp (Marantz)

Discussion in 'Electronic Repair' started by Tim Schwartz, Sep 4, 2013.

  1. Phil Allison

    Phil Allison Guest

    ** Just checked a bin of assorted LEDs for breakdown voltage with a test
    current of around 10uA.

    The lowest was 30V and the highest was 157V - both red LEDs.

    A blue LED was 21V.

    Two white LEDs were 42 and 61V

    LEDs of the exact same type show similar figures, but the variation between
    types is large.

    .... Phil
  2. Leif Neland

    Leif Neland Guest

    Phil Allison tastede følgende:

    If the variation is large, if X percent of the LEDs have a breakdown
    voltage below the one in the circuit, a reverse diode cost Y, the
    repair cost is Z, collateral damage is P, damage to reputation is Q, do
    you pur a reverse diode in?

    Perhapes forward voltage is a median, but if reverse breakdown is
    fatal, it is the 0.001 percentile or something.

    "Don't exceed this voltage, one in ... might break". Don't want it to
    be the gear down indicator on your next flight.

  3. Phil Allison

    Phil Allison Guest

    "Leif Neland" <>

    ** Wot is WRONG with this wog idiot ??

    ** But the threshold is at least 30V for any red, green or amber LED !!!!!!

    Generally much higher and easy to test.

    ** The application is replacing 6V and 12V lamps that run from AC.

    Fuckwit .

    ..... Phil
  4. Leif Neland

    Leif Neland Guest

    Phil Allison har bragt dette til os:
    Your title should go below your name, not above.

  5. Phil Allison

    Phil Allison Guest

    ** Your mother needs shooting.

    What a vile piece of know nothing, autistic scum you are.

    Get off this newsgroup for ever.

    .... Phil
  6. Guest

    Grin.. yeah large variation. We're using these red led's (AND114R) as reverse biased photo detectors. Vbreak ~25 volts. The same company makes a similar led.. same material, same wavelength (AND113R) a bit more light. It's breakdown voltage is ~120 V.

    Thanks for the measurements.

    George H.
  7. Guest

    Huh? If it's critical just put another LED or diode back to back in parallel. (I wonder if someone already makes such a device.)

    George H.
  8. Leif Neland

    Leif Neland Guest

    Ian Field udtrykte præcist:
    Yes, that is my point.
    Here's some old news:
    One half of the led lights in the positive half-cycle, the other half
    in the other half-cycle.

  9. Leif Neland

    Leif Neland Guest

    Phil Allison tastede følgende:
    It would be interesting to test this:

    12V AC, one led with a dropping resistor, giving say 10mA.
    Another led, with a diode in reverse, same size dropping resistor.

    24V AC, similar circuits. (dropping resistor having the proper larger

    Run for a a couple of months, or until a led fails.

    I bet it will be the one at 24V without diode in reverse.

  10. Phil Allison

    Phil Allison Guest

    "Leif Neland" <>

    ** **** off RETARDED TROLL !!!!!!!!!!
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