Alright so my proejct is that a replaced a backlight on my lcd monitor with some 12V led strips. I couldn't find a 12V power on my LCD circuit board (didn't play too much with it though and won't [luckily it didn't fry]). Anyways, I am using a 12V power brick to power it.
I am trying to create a trigger using the led on the monitor (the one that tells the user that its on [blue]). If that blue light is on. Turn on the backlight.
The LED voltage is 2.75V. The led strip that I want to power is 12V (current about 600-650mA).
I tried connecting the power button on the monitor to a ne555 and made a trigger switch but it didn't work because the circuit connected to the other circuit (circled in red).
I also tried doing some mechanical modifications to the frame by making the power button plastic trigger my 'new button' and the original power button' but there wasn't enough room. If there is a way to make the original power button trigger the ne555 without affecting the lcd circuit (i wish the button had 2 switches rather then one) I would be golden.
I also tried using a 5V relay by 'stealing' the LED voltage and stepping it up to 5V but that didn't work (I don't think it had enough current), as the led powered off and the relay didn't trigger. It did show 5V on my multimeter though.
So I thought maybe some opto-isolators might work to trigger the ne555? I have some but don't know how they work (popped one by playing around... trashed now). I have 4n35 opto-isolators.
Any ideas what I can do? I have no transistors... Ordering some but that will take a while.
I am trying to create a trigger using the led on the monitor (the one that tells the user that its on [blue]). If that blue light is on. Turn on the backlight.
The LED voltage is 2.75V. The led strip that I want to power is 12V (current about 600-650mA).
I tried connecting the power button on the monitor to a ne555 and made a trigger switch but it didn't work because the circuit connected to the other circuit (circled in red).
I also tried doing some mechanical modifications to the frame by making the power button plastic trigger my 'new button' and the original power button' but there wasn't enough room. If there is a way to make the original power button trigger the ne555 without affecting the lcd circuit (i wish the button had 2 switches rather then one) I would be golden.
I also tried using a 5V relay by 'stealing' the LED voltage and stepping it up to 5V but that didn't work (I don't think it had enough current), as the led powered off and the relay didn't trigger. It did show 5V on my multimeter though.
So I thought maybe some opto-isolators might work to trigger the ne555? I have some but don't know how they work (popped one by playing around... trashed now). I have 4n35 opto-isolators.
Any ideas what I can do? I have no transistors... Ordering some but that will take a while.
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