They are called tachometer generators. Typically 50Volts/1000 RPM. But you can get higher voltages than that. This site says up to 200Volts at 1000 RPM. To get 500Volts, you run it at 2500 RPM. The voltage is directly proportional to the speed. If these are too small, you could also buy a 500VDC motor and energize the field, running it as a generator. You can usually get them with 150 / 300 Volt fields. They also make them in permanent magnet fields, but only rated at 180Volts @1750 RPM. You would have to run at 5000RPM, which might not hold up. Rectified 120V Ac is about 150 volts.
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Today's Featured Article - On the Road with Dave Gohl: Auction Musings - by Dave Gohl. I was thinking the other day about all the auctions I've been to in the last few years. There've been many. Some have been very good, some have been well, disappointing to say the least. But no matter how good or bad auctions may be, we always seem to stay until the item we've come for or are interested in is on the block. I've been to some auctions near and far. I think the furthest has been the Two Cylinder 7 in the Amana Colonies last year. Lots of stuff, lots of people. I've also atten
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