[R-390] Rube Goldberg 400 cycle ac

[Bill Hawkins]

The audio amplifier works just fine. I found a 200 watt SS
amp for a building system that ran off 28 VDC or 120 VAC.

Years ago I had a WWII gyrocompass with a 3 phase 400 cycle
motor. Found a small 28 VDC to 400 cycle, 115 VAC that was
single phase. Hooked it across two of the three phase wires
and connected a 2 mfd cap between the third and either of the
two power leads and spun up that gyro.

The thrill faded, as thrills do, and I lost track of the stuff.

Sometimes you can find cheap old frequency synthesizers that
don't reach high enough to be interesting to most people.

If you're really a fan of Rube, you can build an inverted RC
phase delay circuit (180 + 60) after a 400 Hz oscillator and
feed 2 audio amps to get something close to true 3 phase power.

Regards,
Bill Hawkins