Wind-up torch    hand cranked, dynamo, LED  -Amended-
Wind-up torch    hand cranked, dynamo, LED  -Amended-
Wind-up torch    hand cranked, dynamo, LED  -Amended-
Wind-up torch    hand cranked, dynamo, LED  -Amended-
Wind-up torch    hand cranked, dynamo, LED  -Amended-
Wind-up torch    hand cranked, dynamo, LED  -Amended-
Parts list

A white 5mm LED. I think it's 2000mcd, it came out of my junk box.
A red 3mm LED - high brightness. Optional. Lights when the capacitor is being charged by the dynamo.
A 1 Farad, 5.5 Volt capacitor.
A hand held crank dynamo. I got it at Jaycar electronics. I think the motor/gearbox from a simple toy car would probably work just as well.
It puts out about 5 Volts at top speed, so I thought it was a good idea to use a comparable capacitor.

Lots of patience. And coffee. And ciggies.


The switch stops the capacitor from discharging straight into the white LED, that would make it a hand-cranked light, and not a wind up, to use hands free, torch.

Step 1: The dynamo crank

Wind-up torch    hand cranked, dynamo, LED  -Amended-
This is the dynamo crank. Turn the handle on the side and the gears turn the dynamo, and through the magic of science, electricity comes out...

Step 2: The little red LED

Wind-up torch    hand cranked, dynamo, LED  -Amended-
This is the little red LED not lighting because it's really hard to crank the dynamo and take photos at the same time.

Step 3: The little red LED who could...

Wind-up torch    hand cranked, dynamo, LED  -Amended-
This is the little red LED being a team player, and lighting, to show I'm cranking the dynamo...

Step 4: Let there be light!

Wind-up torch    hand cranked, dynamo, LED  -Amended-
I plug the red wire into the negative terminal strip (because I'm too cheap to use a switch in something I'm only breadboarding), and Presto! Light!
Not bad for a cheap white LED, around 2000mcd I think.

Step 5: The schematic

Wind-up torch    hand cranked, dynamo, LED  -Amended-
The amended schematic, showing the (optional) red LED facing the right way.
Sorry about the mistake, my bad.

Step 6: The dynamo crank unit

Wind-up torch    hand cranked, dynamo, LED  -Amended-
Three photos that may make it a bit clearer as to how it works.
First, the unit side on.

Step 7: The dynamo crank unit, side on

Wind-up torch    hand cranked, dynamo, LED  -Amended-
Conventionally, power is applied to a motor, through the solder tabs, turning the motor and the drive shaft.
The dynamo crank works in reverse, turning the drive shaft and the motor, and supplying power through the solder tabs, to the circuit.

Step 8: The dynamo unit face up

Wind-up torch    hand cranked, dynamo, LED  -Amended-
Turning a motor spindle by hand, to generate power, is not as efficient as using a gearbox, unless you have plenty of time...

Step 9: The gearbox end-on.

Wind-up torch    hand cranked, dynamo, LED  -Amended-
A blurry photo showing the gearbox end on.
As you might be able to see, the gearbox is used to turn the drive shaft of the motor.

Step 10: Probably not the last step...

I've had to amend the schematic because I'd put the red LED in the wrong way around.
Thanks to LasVegas for pointing that out.
 
 

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