Battery-free dynamo flashlight with gold-cap capacitor
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This flashlight requires no batteries and is always ready for use
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Model information
- Source
- Printables
- Category
- Electronics
- License
- Creative Commons — Attribution
Yes, I know – these days everyone already owns one or more flashlights. But this little flashlight is a little different.
It requires no batteries, rechargeable batteries, or charger, making it ALWAYS ready for use. By simply turning the rear cap, a capacitor is charged in a very short time using a small gear motor in generator mode. A "YX 8115" LED driver lights up a white LED even at a low charging voltage.
This driver requires an additional inductor to operate.
The motor is a miniature "N 20" gear motor with 6 V and 300 rpm (this speed has proven to be the most effective). The motor is attached with two approximately 4 mm long M1.6 screws – but it can also be used without them if the components are embedded in hot glue for reinforcement.
The LED is a 5 mm type with 14,000 mcd. Only 7 components are required.
Printing is straightforward, assuming proper calibration of the printer and filament.
Although this small flashlight doesn't have the power of conventional LED bulbs, it could still be of interest as an "EverLight" emergency light or for hobbyists.
Parts list:
- Miniature gear motor type N20; 6V; 300rpm
- LED driver YX8115
- 5mm water-clear white LED, e.g., type "WTN-5-14000pw" 14000 mcd; 2.8V; 20mA
- Inductance 220µH
- Miniature push button switch
- Bridge rectifier, round design, e.g., B80C1500
3 Goldcap capacitors 0.47F 5.5V, "Type H" design!
Capacitance: 0.47F
Voltage: 5.5V
Diameter: approx. 12.6mm
Height: approx. 4.8mm
Pitch: 12.7mm