Hi all... I was having a think the other day (and I haven't had chance to get on to ask)... but those passive speakers you get are powered by something right? and they only have a 3.5mm jack in them... so does anyone know by chance how much oomph they put out? (I was thinking LEDs maybe) Thanks all Sharn
so... it depends on the outlet? thing is I work for a tourbus company, and my phone sometimes goes dead... we use 3.5mm jacks for the headphone ports, so (as well as the LEDs from the 3.5mm jack in the PC) I wanted to mod a nokia charger to work with the headphone outlets
Speakers also operate on AC I believe, so even if there was enough power there you would still need to design a AC->DC circuit to make the power usable.
Hmm, presumably if you just connected an LED + resistor across a speaker terminal, it'd flash at the same frequency the speaker's going at, maybe even to the point of varying brightness with frequency!
It does, but a few points; No flash at all until the voltage exceeds the LED forward voltage (though that makes it good for picking up the louder beat); You'll need a diode in inverse parallel with the LED to limit reverse voltage A 50W amplifier has around ±33V max at the speakers so apart from blowing LEDs you can get a shock Better way is to get the speaker voltage to trigger a transistor switch to the lighting, that only needs >0.7V.
Is there any chance I can make it only work with music and make it not pick up sound from games or the various Windows sounds? I'm just thinking for if I have a friend round and I play CS: Source and the LEDs flashing whenever I fire a round might get a tad annoying If not I'll just stick a manual switch in the circuit even better, could I just get a speaker, take it apart and attach LEDs to it... then play a frequency on the line out port (Having my speakers in a different port)... then it flashes to that frequency?
