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#1
Posted to alt.electronics
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Change HD & Power leds
I would like to change the led's in a old pc I recovered amber=power
green=hd from there factory color to different colors like blue and super red led's. I use to play electronic hobbies years ago so Im concerned that if I just solder the defferent color leds to the leads I might fry something. Any help welcome |
#2
Posted to alt.electronics
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Change HD & Power leds
On Mon, 02 Feb 2009 14:40:24 +0000, John wrote:
I would like to change the led's in a old pc I recovered amber=power green=hd from there factory color to different colors like blue and super red led's. I use to play electronic hobbies years ago so Im concerned that if I just solder the defferent color leds to the leads I might fry something. Any help welcome Sorry amber is HD and green is power. |
#3
Posted to alt.electronics
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Change HD & Power leds
On Mon, 02 Feb 2009 14:51:36 GMT, John
wrote: On Mon, 02 Feb 2009 14:40:24 +0000, John wrote: I would like to change the led's in a old pc I recovered amber=power green=hd from there factory color to different colors like blue and super red led's. I use to play electronic hobbies years ago so I’m concerned that if I just solder the defferent color led’s to the leads I might fry something. Any help welcome Sorry amber is HD and green is power. --- Measure the supply voltage and get the voltage and current specs for the new LEDs and then figure out what the values need to be for the new series resistors, like this: Vcc - Vled R = ------------ Iled Where R is the resistance of the resistor, in ohms, Vcc is the supply voltage, in volts, Vled is the LED forward voltage, (from the data sheet) and Iled is the LED forward current. (from the data sheet. Then determine how much power the resistors will be dissipating, like this: P = (Vcc - Vled) * Iled where P is the power dissipated, in watts. A convenient rule-of-thumb to follow is to use a resistor which is rated to dissipate 2P. Once you've done all that and you have the parts on hand, carefully unsolder the old LEDs and resistors and solder in the new ones making sure you don't get the LED polarities backwards. JF |
#4
Posted to alt.electronics
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Change HD & Power leds
On 2009-02-02, John wrote:
I would like to change the led's in a old pc I recovered amber=power green=hd from there factory color to different colors like blue and super red led's. I use to play electronic hobbies years ago so Im concerned that if I just solder the defferent color leds to the leads I might fry something. powersupply for the existing LEDs is most probably 5V through a series resistor, so just replacing the leds should work. the new leds may not light to full brightness but will probably look good none-the-less. There's no risk of damage to the PC by this modification as long as you take due care. |
#5
Posted to alt.electronics
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Change HD & Power leds
On 6 Feb 2009 08:47:28 GMT, Jasen Betts wrote:
On 2009-02-02, John wrote: I would like to change the led's in a old pc I recovered amber=power green=hd from there factory color to different colors like blue and super red led's. I use to play electronic hobbies years ago so I’m concerned that if I just solder the defferent color led’s to the leads I might fry something. powersupply for the existing LEDs is most probably 5V through a series resistor, so just replacing the leds should work. the new leds may not light to full brightness but will probably look good none-the-less. There's no risk of damage to the PC by this modification as long as you take due care. --- Bad advice. He needs to _know_ what the supply voltage is and the Vf and If of the LEDs he wants to use before he can proceed with the modification intelligently. JF |
#6
Posted to alt.electronics
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Change HD & Power leds
On Fri, 06 Feb 2009 07:32:13 -0600, John Fields wrote:
On 6 Feb 2009 08:47:28 GMT, Jasen Betts wrote: Thanks for the replys. |
#7
Posted to alt.electronics
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Change HD & Power leds
On 2009-02-06, John Fields wrote:
On 6 Feb 2009 08:47:28 GMT, Jasen Betts wrote: On 2009-02-02, John wrote: I would like to change the led's in a old pc I recovered amber=power green=hd from there factory color to different colors like blue and super red led's. I use to play electronic hobbies years ago so IÂ’m concerned that if I just solder the defferent color ledÂ’s to the leads I might fry something. powersupply for the existing LEDs is most probably 5V through a series resistor, so just replacing the leds should work. the new leds may not light to full brightness but will probably look good none-the-less. There's no risk of damage to the PC by this modification as long as you take due care. --- Bad advice. what can go wrong? He needs to _know_ what the supply voltage is and the Vf and If of the LEDs he wants to use before he can proceed with the modification intelligently. we're talking PC assembly here, intelligence isn't really needed the motherboard already has resistors for the existing LEDs changing in higher voltage LEDs isn't going to damage anything. |
#8
Posted to alt.electronics
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Change HD & Power leds
On Feb 6, 9:32*am, John Fields wrote:
On 6 Feb 2009 08:47:28 GMT, Jasen Betts wrote: On 2009-02-02, John wrote: I would like to change the led's in a old pc I recovered amber=power green=hd from there factory color to different colors like blue and super red led's. I use to play electronic hobbies years ago so I’m concerned that if I just solder *the defferent color led’s to the leads *I might fry something. powersupply for the existing LEDs is most probably 5V through a series resistor, so just replacing the leds should work. *the new leds may not light to full brightness but will probably look good none-the-less. There's no risk of damage to the PC by this modification as long as you take due care. --- Bad advice. He needs to _know_ what the supply voltage is and the Vf and If of the LEDs he wants to use before he can proceed with the modification intelligently. JF * Actually it was good advice. They are current limited already, within the typical sub-20mA range as with any other 100mW encapsulated LED. This is a necessary design parameter for motherboards. You can blindly grab a similar looking LED and hook it up to any motherboard without issue, and indeed that is exactly what happens when you install your choice of motherboard into a computer case. The intelligent data collection choice is significant if a mistake would take a great deal of time or expense if things went wrong, which it won't, or if there was nothing yet known about motherboard circuitry, which there is. |
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