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blogroll
Fri, 10 Feb 2006
How's that for a burning discharge?
To the right you see the new face of my plasma tweeter, i.e., my old Sony CDX-F7705X (now sans CD mechanism because it broke and I decided that if I couldn't fix it, at least I could have fun breaking it more). I'm using it for three purposes: further preamplification, audio filtering, and for EMI isolation of whatever is actually providing the audio. If I got an antenna, I could use it as a radio, too, I suppose.
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What do you get when you take an old Dell laptop power brick and a car stereo with a broken CD mechanism? You guessed it, a nifty-looking preamp for your plasma tweeter. Unfortunately, replacing the 22V zener in the brick with a 13V one to get something more like automotive voltages seemed to trip some sort of overload sensor, so I just went with the poor man's solution: a 4 ohm resistor in series with the supply drops the voltage by between 2.5 and 5 volts. So what if I'm burning 6 watts in the process? That's what power resistors are for.
OK, it's 3a. I've got a design review (attending, not giving) in 7 hours, so it's definitely bed time.
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