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Making an led brighter

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jknightandkarr
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Making an led brighter

Postby jknightandkarr » Thu Feb 02, 2017 9:47 pm

I replaced the power and hdd leds on my desktop, and noticed that the hdd led is really dim. I was thinking of maybe making a power boosting circuit to help. I figured using a switching transistor to use off of the power supply's 5v line to power it n the hdd terminal on the mother board to trigger the led. I already have the correct value resistor for a 5v source. Is this good solution or is there a better circuit to use? Thanks.

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Re: Making an led brighter

Postby Granz » Sat Feb 04, 2017 7:31 am

There may be a better way (depending on what you mean by "better") but this should work, and it will be simple.

How far is the new LED from the HD and the motherboard? If they are a long distance (probably more than a couple meters) then you may want to look into distance signalling.
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Re: Making an led brighter

Postby jknightandkarr » Sat Feb 04, 2017 12:00 pm

The led cable is is like less then 2 ft from the connector on the motherboard. I checked the voltage on the motherboard signal and got about 2 volts max, the led is 3.3v and right now is not using any resistors. My guess is the led for the hdd might use something like pwm, so i was thinking of some form of boosting system for the led, but i dont know if transistors can be triggered by 2v n down to about 1.5 v. How does that other method work?

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Re: Making an led brighter

Postby Granz » Sat Feb 04, 2017 6:05 pm

jknightandkarr wrote:The led cable is is like less then 2 ft from the connector on the motherboard. I checked the voltage on the motherboard signal and got about 2 volts max, the led is 3.3v and right now is not using any resistors. My guess is the led for the hdd might use something like pwm, so i was thinking of some form of boosting system for the led, but i dont know if transistors can be triggered by 2v n down to about 1.5 v. How does that other method work?

Joe

Joe,

For the low-voltage signal, you can use a simple transistor switch (http://www.barryhubbard.com/raspberry-p ... pberry-pi/ - the supply would be your +5V and the load resistor would be your LED plus the current limiting resistor.) If this is not bright enough, you can try lowering the 1K ohm resistor on the base of the transistor a bit - play around to see what works. Jameco (http://www.jameco.com/z/PN2222A-Major-B ... 78511.html) has the transistors for $0.11 each, in quantities of 10.

jknightandkarr wrote:...How does that other method work?...

Do you mean the distance signalling system, I mentioned? If so, that would be something like a microcontroller to monitor the output to the LED on the HD, and when the HD turns the LED on and off, it would send a "command" (maybe ASCII 11H [Device Control 1] for on, and 12H [Device Control 2] for off) over some serial line (like RS-232 or something) to a receiving microcontroller which would turn on and off a local LED where ever you need the display. This would be much more complex than the transistor switch, and you would not need this for only 2 feet - now, in another room, or a nearby building, that would require this kind of signalling system.
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