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From: Adam Bowen
Subject: Re: powering a bulb or led(s) with audio amplifier?
Date: Fri, 25 Oct 2002 04:24:01 -0700
References: <3DB1323B.1F9EA4F0@stanford.edu> <firstname.lastname@example.org>
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thanks everyone for ideas on how to get leds to work, but i've decided
for aesthetic reasons to go with a simpler lamp setup, as dmb suggested.
i forgot that with leds' on/off nature, it won't glow with variable
brightness. so a simpler question: how do i hook up a bulb so as to
ensure the brightest peak light without damaging my amp? put the bulb and
a resistor - relative to the impedance of the speaker - in parallel with
i know these are basic ?s, but it's been a while & i couldn't find the
answer in my electronics textbooks.
> The maximum reverse voltage which a led can tolerate is rather low, 3
> to 5 volts, so they would need protection.
> Using incandescent bulbs is easier. The bulb voltage would depend on
> how severely you want to deafen your audience. Playing a Beethoven
> symphonic work at a realistic (high) volume develops around 4 to 5
> watts average in 8 ohms speakers. 5 watts in 8 ohms means that the
> voltage across it would be a little over 6. Experiment with
> flashlight bulbs.
> > I'm interested in hooking up light-emitting devices in parallel with
> > home stereo speaker. I just want it to glow with the overall
> > I've read most stereo amps push 4-30V; don't know if this is true.
> > like basic DC lamps should work, but I"ve never tried it. LEDs would
> > cool - ideally, those sequenced flashing RGB leds. If necessary, I
> > run the light device on a separate channel and rig whatever
> > necessary.
> > Any ideas about these, or zanier options? (this is for an art
> > Thanks,
> > Adam
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