8V 40mA bi-pin lamp (Marantz)

[Phil Allison]

[email protected]

Gotta agree with Phil, The 5V spec is nonsense.
I haven't found an LEDs that (reverse bias) avalanche at any voltage
less than 20V. If no current flows then what damage is done?

Phil, do you perhaps know the part number of the red LED that could only
take 9V of reverse bias?

Oh.. most of the LED's I looked at took over 100 V of reverse bias till
they avalanched.

** 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

 

[Leif Neland]

Phil Allison tastede følgende:

** 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.

Beancounting:

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.

Leif

 

[Phil Allison]

"Leif Neland" <[email protected]>


** Wot is WRONG with this wog idiot ??

If the variation is large,

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

Generally much higher and easy to test.

if X percent of the LEDs have a breakdown voltage below the one in the
circuit,

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

Fuckwit .


..... Phil

 

[Leif Neland]

Phil Allison har bragt dette til os:

Fuckwit .


.... Phil

Your title should go below your name, not above.

Leif

 

[Phil Allison]

Your title should go below your name,

** Your mother needs shooting.

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

Get off this newsgroup for ever.




.... Phil

 

[[email protected]]

[email protected]





** 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.

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.

 

[[email protected]]

Phil Allison tastede følgende:





Beancounting:



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.

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.

 

[Leif Neland]

Ian Field udtrykte præcist:
Yes, that is my point.

2-pin bi-colour LEDs exist - but the end result won't be either red nor
green.

Here's some old news: http://ledsmagazine.com/news/3/11/14
One half of the led lights in the positive half-cycle, the other half
in the other half-cycle.

Leif

 

[Leif Neland]

Phil Allison tastede følgende:

"Black Iccy"

** For interest sake, I checked a few 5mm white LEDs in stock for reverse
breakdown.

Each exceeded 21 volts with reverse current under 3uA ( maybe nothing)

Be fine with a 12.6V AC heater supply and ONE resistor.

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
value)

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.

Leif

 

[Phil Allison]

"Leif Neland" <[email protected]>


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