Determining cone position

Jrz126 · 24th July 2007, 03:05 PM

I'm pretty big into car audio and I like to add some unique stuff to my system, and lately I've been thinking about adding a small 'strobe light' (probably just using LEDs) that would shine on the woofers. I would control the strobe light with a small microcontroller and I could program it to do a bunch of different things.

Its an odd project, but I've never seen it done before, so it would be something different.

Programming the microcontroller would be somewhat easy, its just trying to get an accurate measurment of the cone position that would be difficult. Would it be possible to figure it out by looking at the voltage/current of the woofer, or do I need to use an external mic?

richie00boy · 24th July 2007, 03:21 PM

For position, I think you would have to use some kind of laser inferometry (sp?)

It may be possible by looking at current and frequency, would be quite hard though, a lot of processing.

PigletsDad · 24th July 2007, 03:22 PM

For the purposes of running a strobe, I think the voltage on the driver would be a good enough clue to cone position.

At low frequencies (below system resonance) cone displacement is proportional to voltage, so this is a pretty sane choice.

24th July 2007, 03:05 PM	#1
Jrz126 diyAudio Member Join Date: Mar 2003 Location: Erie PA	Determining cone position I'm pretty big into car audio and I like to add some unique stuff to my system, and lately I've been thinking about adding a small 'strobe light' (probably just using LEDs) that would shine on the woofers. I would control the strobe light with a small microcontroller and I could program it to do a bunch of different things. Its an odd project, but I've never seen it done before, so it would be something different. Programming the microcontroller would be somewhat easy, its just trying to get an accurate measurment of the cone position that would be difficult. Would it be possible to figure it out by looking at the voltage/current of the woofer, or do I need to use an external mic?

24th July 2007, 03:21 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	For position, I think you would have to use some kind of laser inferometry (sp?) It may be possible by looking at current and frequency, would be quite hard though, a lot of processing. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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24th July 2007, 03:22 PM	#3
PigletsDad diyAudio Member Join Date: Jul 2007 Location: South Worcestershire	For the purposes of running a strobe, I think the voltage on the driver would be a good enough clue to cone position. At low frequencies (below system resonance) cone displacement is proportional to voltage, so this is a pretty sane choice.

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