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In the Forum: Horn-Loaded Speakers
In the Thread: Vitavox S2 with Electromagnets

Post Subject: Ahigh voltage coilPosted by Bud on: 2/28/2010

CV,

All that you point to is quite correct. My comments were based strictly upon which coil voltage would be a superior sounding electromagnet. The only benefit I can see to a higher voltage is the faster rise time in the voice coil of the induced EMF with reference to the secondary load impedance of a higher voltage secondary. I did caution Romy that the supply would end up basically as a floating battery charger, preferably with a 3% reg power transformer to further stiffen the secondary impedance. As for how much better this would be, I cannot imagine any benefit other than a faster acceleration of the voice coil diaphragm.

Providing a constant current source to a low voltage coil might be equally effective and could be done with the coil he has. I am not the guy to provide the numbers for that though. I know that circuit board designs for Express PCB and use documentation can be had from Gary Pimm's web site for free but beyond that I cannot offer much help, can you? It would certainly be an interesting experiment and might even be the answer to the "range" of usability that Romy found from the original voice coil. A range where not all of the desirable characteristics found could be had at one time.

Bud

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