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Fri, 10 Feb 2006 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. [ permalink | 0 comments (add one you lazy bastard!) ] writebacks (add one you lazy bastard!)post a comment: |
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