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  • steve.rand commented on noahw's instructable LEDs for Beginners2 years ago
    LEDs for Beginners

    Any additional voltage will change the formula, so it's possible that you are letting the LEDs draw too much current, which burns them out. It's also possible that for cheapness' sake, there is no resistor on your fairy lights as lithium batteries tend to have a very low discharge rate which is probably just right for the LED's, but now you have AA's which can dump way more current, that this is what has burnt them out.

    If you have your three positions, I imagine there would be two pins for the two "on" positions, in which case you could wire the led to both pins, but use a different value resistor for each, and the negative can come in on the common "input" pin.I imagine the switch would break the circuit when it's off, join the circuit to pin1 at one position, then cut that and join the circuit to pin2. If it's a sliding thing and there is a chance that pin1 and pin2 can be bridged while the switch is sliding, I guess you'd have two inputs with two resistors in parallel which reduces the resistance and could overdrive the LED. There is probably a way around that or you could make sure the sliding switch (brass spring contact type) has a large enough separation that it never contac...

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    If you have your three positions, I imagine there would be two pins for the two "on" positions, in which case you could wire the led to both pins, but use a different value resistor for each, and the negative can come in on the common "input" pin.I imagine the switch would break the circuit when it's off, join the circuit to pin1 at one position, then cut that and join the circuit to pin2. If it's a sliding thing and there is a chance that pin1 and pin2 can be bridged while the switch is sliding, I guess you'd have two inputs with two resistors in parallel which reduces the resistance and could overdrive the LED. There is probably a way around that or you could make sure the sliding switch (brass spring contact type) has a large enough separation that it never contacts pin1 and pin2 simultaneously.

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  • Simple cable earphone or headphone organiser

    NIcely done!Quite handy if you just want to throw earbuds in your bag or pocket without them becoming a knotted mess.There are commercial products on the market that do a nice job, but I always found that i'm left with a fairly bulky organiser in my pocket when i'm using the earbuds. The credit card trick means it goes right into my wallet like no extra inconvenience!

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