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Old 09-22-2020, 01:08 AM   #1 (permalink)
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Hand cranked torch

Little project I did for UK electronics mag Practical Electronics. Ideal bedside torch - at night, you can still see the LED faintly glowing days after last winding it.

Much better durability than commercial rechargeable battery torches. I have capacitor-based hand-cranked torches still working well after 15 years!

Pics tell the story.














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Old 09-30-2020, 11:58 PM   #2 (permalink)
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Neat!

Can you adapt it to falling weights like a grandfather clock?
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We are operating at an overall mechanical efficiency of only four percent… Therefore, we find that if we increase the overall mechanical efficiency to only twelve percent we can take care of everybody. That three-fold increase in the overall efficiency can only be accomplished by redesign. – R. Buckminster Fuller

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Old 10-01-2020, 03:28 AM   #3 (permalink)
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Quote:
Originally Posted by freebeard View Post
Neat!

Can you adapt it to falling weights like a grandfather clock?
You'd have to add a few more geartrains. But I like the idea!

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