Resistors are always nice. If your power supply shifts a little in voltage, your LED's won't go thermal-runaway and short out.
I saw someone make a device that had a heatsink affixed to the hot side and a long metal rod affixed to the cold side. The rod was inserted into...
Actually, an optoisolator is the best way to go. There is a guide to using them somewhere on the site.
E=0.5CV^2. About 0.71 joules, not too much. I wouldn't discharge it with a screwdriver because it may be very hard to remove it. As cpemma...
I think a better solution would be to scale the voltage to the peltier according to the temperature of the processor.
I don't know much about UK mains voltage (as far as the phasing of the mains power), but if it is single phase, you can just switch the hot wire.
If you used an NPN transistor you could probably run the thing off of one wire (the 5 volt one) and not have to bother with hooking the grounds...
Why not a FET or a MOSFET? Much higher power ratings (tens of amps).
Actually, they do make the switches he is describing, but they are very likely for a much higher temperature than is useful in a computer case.
Remember to tie unused inputs to ground.
Care to share where you got these LEDs?
I thought he meant to connect it to the HD LED header.
I meant one megawatt, but you'll get shut down just the same.
Ditch the decoupling capacitors and that diode that shorts the 5 volt rail to ground. From the look of it, you'll want a PNP transistor (2N3906...
5 megawatts is quite a bit of power. I don't know what the laws are in Norway, but the FCC allows unlicensed FM transmitters in the milliwatt...
Perhaps Crystal Control thinks you are running an 8X2 display.
The majority of LEDs in equipment are 3.7 or 5 volts at 20 milliamps. You can test by running the original one off of 5 volts with a 68 ohm...
Buy a few 555 timers and see where you can go from there. Try a basic monostable circuit and then graduate to astable. From there, you can go to...
The code would be 104 (10x10^4 pF).
If you're just using it to power on your motherboard, you don't have to use a relay. You can just use a NPN transistor of pretty much any sort....
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