On 3/27/13 3:20 PM, Bob Camp wrote:
Eight ohms at 28 volts would be just a bit under 4 amps. It's also right at 100 watts. I'd be very surprised it you need anywhere near that much current. You probably want a pure sine wave to keep everything happy. A lot of the simple inverters are "sort of" sine waves. I think I'd vote for something like an cheap audio amp driven by a nice clean / stable 400 Hz tone.
So, if I take my nice clean 10 MHz, rig up a counter that counts to 25,000, and a suitable PROM and DAC... (or run a DDS chip)... I think that would be a "clean and stable" 400 Hz.
Of course, for the more mechanically inclined.. what about a big flywheel driving an alternator. You might be able to rejigger a car alternator. I don't recall how many poles they have..you might have to spin it pretty fast.
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