Foe real bright LEDs look at "Luxeon Star LED" they are super.
> w_tom wrote:
> > As a result, indicator lamps on aircraft even way back then
> > were replaced with LEDs. Did they change the voltage? Of
> > course not.
>
> Not the voltage of the aircraft, and probably not the voltage going to the
> socket, but they certainly had to change the voltage going to the diode(s)
> proper (said circuitry would likely be part of the LED assembly, if they
> wanted it to be a "drop-in" replacement).
>
> --
> John Miller
> Email address: domain, n4vu.com; username, jsm
>
> A political man can have as his aim the realization of freedom, but he has
> no means to realize it other than through violence.
> -Jean Paul Sartre
>
Holden Bonwit wrote:
> I was curious if anyone knew of a vendor who makes/sells high voltage
> LEDs. I have a 25 volt power supply, and for various reasons don't
> want to step down the voltage to ~12 volts with a voltage regulator.
LEDs are current, not voltage driven. In other words, you need a current
limiting resistor in series with the LED. You can calculate the
resistance required by (Vin - Vled)/ current, current is usually 20 mA.
If the voltage is likely to change, or if you are to lazy to do the
calculation, use a FET as constant current source, I have posted the
schematic here a couple of times, use google.
You can also buy LEDs with that FET integrated on the chip, these work
on any DC source up to 30 V.
Re: 25 Volt LED?
Re: 25 Volt LED?
> > As a result, indicator lamps on aircraft even way back then
> > were replaced with LEDs. Did they change the voltage? Of
> > course not.
>
> Not the voltage of the aircraft, and probably not the voltage going to the
> socket, but they certainly had to change the voltage going to the diode(s)
> proper (said circuitry would likely be part of the LED assembly, if they
> wanted it to be a "drop-in" replacement).
>
> --
> John Miller
> Email address: domain, n4vu.com; username, jsm
>
> A political man can have as his aim the realization of freedom, but he has
> no means to realize it other than through violence.
> -Jean Paul Sartre
>