Generate electricity while keeping fit. Inspite of other freehand exercises, just sit on and padel furiously on the rebuilt PPPM I. Efficient and versatile, the Pedal Generator charges batteries, that run an inverter, that produces 110v AC, that powers LED lights, the monitor on a computer, and many other small battery-powered things. It is the most inspiring workout one can imagine!
It is in 1976; David built the first version of the Pedal Generator. Improving over similar bicycle generator designs, David rebuilt it for efficiency and versatility. It is a General Electric Permanent Magnet Motor. It is claimed to be a very nice heavy-duty, ball bearing unit. David had to spend only USD $29 for his efficient pedal generator.