Fri Sep 16 17:44:04 PDT 2016

A Solar Powered Flag Waver

Solar Powered Flag Waver
(Solar Powered Flag Waver)

This is a solar powered flag waver. It uses a solar cell from an old calculator to charge up an electrolytic capacitor. When the voltage across the capacitor reaches a trigger threshold the charge on the capacitor is released through an electric motor taken from an old video recorder waving a small flag.

I am not the original author of this circuit! Tinker Jim of instructables is! The original article is here: It is a really interesting article with lots of carefully researched information. The circuit seems to be nicely reliable - as Tinker Jim describes. It sits on a bookshelf and gradually converts photons into mechanical energy - constantly and gently surrendering to the passage of time.

The power of the flag waving motion is not overly dramatic, it has to be said. But the circuit is a nice example of the concentration of energy in a capacitor followed by its controlled release when a threshold is reached - which is the basis of a wide variety of different circuit types.

Solar Powered Flag Waver Schematic
(Solar Powered Flag Waver Schematic)

The circuit diagram is shown here for completeness - but visit Tinker Jim's excellent Instructable article for all the details.


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Posted by ZFS | Permanent link | File under: electronics
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