Without the battery, the spring can power the torch for only three or four minutes.
Without the battery, the spring can work the torch for only 3-4 minutes at a time.
The spring is wound for half a minute, and then unwinds over six minutes, charging a battery in the process, and providing enough energy to run the radio for an hour. (This means the radio's spring-controller circuit is no longer necessary.) Thus, Freeplay has switched from making solely spring-powered devices to making battery-powered devices that are equipped with a clockwork mechanism for recharging and emergency use.
It contains a rechargeable battery, into which energy from the spring can be dumped.
This contains a rechargeable battery, into which energy from the spring is dumped.
Our only complaints with the design are the size of the WiFi key (gloved or ham-handed users may find it difficult to press) and the lack of some sort of tab, notch or spring to help open the battery door.
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The final step is to do away with the spring altogether, and charge the battery direct from the winding action.
But running time can be extended by repeatedly winding up the spring and transferring its energy into the battery.
Repeatedly winding up the spring and dumping its energy into the battery (a process that takes about two minutes) can increase the total running time.
The use of a rechargeable battery, which can be charged up with energy from the spring several times, and then occasionally topped up during use, dramatically reduces its size and weight.
Its spring is wound for half a minute, and then unwinds over six minutes, charging a battery.
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