CHANGSTAR: Audiophile Headphone Reviews and Early 90s Style BBS
Lobby => DIY => Topic started by: PelPix on August 18, 2012, 04:25:14 PM
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I don't really want to get into too many details right now, but I've created a theoretically perfect transducer that converts AC signal into air compression waves with no nonlinear distortion in theory and negligible nonlinear distortion in practice. It requires no physical dampening and the signal is pure straight off the transducer. It has a frequency response of within 0.2dB from 20hz to 30khz.
This part is done and ready. This transducer exists and is working. The problem I am having is powering it. The impedance is very, very low. I'm talking hundredths of an Ohm--essentially a short-circuit.
HOW DO I POWER IT?! I DID NOT START THIS TO BE STOPPED HERE.
Even if I could somehow make an amp to drive this, how in God's name would I make a cable that could transport the resulting signal?
I've solved this problem by putting transformers in the earcups, but I don't want to have to add that weight and signal degradation.
If this doesn't work out, I could always market it as a lab microphone. It works both ways and the FR and specs are the same whether it's converting from sound to signal or signal to sound.
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Are you building ribbon speakers?
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Are you building ribbon speakers?
Yes and no. It's a reinvention based on the same basic concept as ribbon and planar speakers, but for headphones.
But essentially, in terms of the problems I'm having, yes. You just can't make a low-mass driver this small and power it. The impedance is just too low!
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1.Just build an amplifier with positive current feedback, combined with negative voltage feedback (for stability). In theory you could achieve an output impedance below zero.
2.Another way to go would be to use a resistor in series. I doubt the reduced electromagnetic damping would be noticeable, but you probably would need to overcome an inner resistance (in yourself)..
3. Use other kind of power instead of electricity (controlled annihilation of antimatter, compressed air etc etc).
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Just found out that the Violectric V200 can power my drivers with 1-1 (No, but at least it's not negative) damping. Its output impedance is 0.06 Ohms, about the impedance of my drivers!
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Wow, any updates on this pelpix? any pictures somewhere?
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Wow, any updates on this pelpix? any pictures somewhere?
Nope. Trying to figure out how to tune them in terms of resonant frequency. Waiting to buy a Paradox to have a reference for a flat FR