[Vexs]

Might be fun to make an electric clock that uses gravity, go full circle.

[fla]

Rotor systems like in some automatic watches produce very little energy. Even at 100% efficiency it wouldn't be able to sustain an electronic circuit.

Edit: I was wrong. See below.

[mattgrice]

Seiko Kinetic watches are quartz watches that are powered by movement. That's 30 year old technology.

[fla]

I stand corrected

[Vexs]

Not only is that not what I was thinking of, which was more akin to a grandfather clock, but I don't believe that at all. Just using piezoelectric vibration sensors I was able to charge a cap to light up an LED- a rotor mechanism would generate much, much more power, and consider today's energy efficient ICs I see know reason why it wouldn't work.

[aidenn0]

My automatic watch contains an electronic circuit, so I'm not sure what your point is.

[fla]

Interesting. What is the circuit for ?

Are you sure it's not powered by a standard watch battery ?

[aidenn0]

Yes, it is a quartz movement with a capacitor that is charged by a mechanism similar to a mechanical auto-winding watch.

https://en.wikipedia.org/wiki/Automatic_watch#Automatic_quar...