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A look at the R20 Javelot LED torch from Olight. A simple design and operation with a single base/tail switch for operation, and a micro USB hidden under a protective collar. Test includes beam shots, charging speed and an overview of the R20 Torch/Flashlight
Sample supplied via Olight for unbiased review
Details from the maker:
Olight R20 Javelot LED Torch
R20 Javelot is a compact rechargeable LED flashlight with Cree XPL HI LED, maximum output up to 900 lumens with a beam distance of 314 meters.
Built in protection board and come with a customised 2600mAh 4.2V rechargeable lithium ion 18650 battery. (Micro-USB charging Not support standard 18650 battery).
A protection ring inside the neck charging port keep the R20 Javelot flashlight from dust and water.
Amazing function: R20 Javelot has low voltage battery warning by indication light. When battery voltage is lower than 3.0V, the indicator light turns red then turn off to inform you that the light needs to be charged.
• Lightly press the tail switch to cycle through the brightness levels.
• Charging port inside the neck of the flashlight using a protection ring for dustproof and waterproof capability.
• Tail cap with lanyard hole, Capable of standing on the head for area lighting.
• High 900 Lumens/3min-450 Lumens/2.5h
• Med 100Lumens/11h
• Low 10 Lumens/100h
• Light Source:Cree XPL HI
• Dimensions: Head 132*Bezel 31.5 mm/ Head 5.2* Bezel 1.24 inch
• Weight (With Battery): 86g/3.03oz
• Battery Source:1×18650(Customized)
• Operating Voltage:2.8 – 4.2 V
• Waterproof: IPX8
• Impact Resistance:1.5 Meters
Inside the Box
• R20 Javelot
• User Manual
• 2600mAh 18650 Battery (Customized)
24-inch diameter would be fine. Bearings should be in good shape. Rotation should be fairly straight. Make
sure the rim is non-magnetic.
±10 inches in the diameter (not crucial at all). The rotor doesn’t have to be bicycle wheel. Any non-magnetic
rotating wheel of similar size and weight should work. These plans are for a 24-inch rim. If you go smaller or
large than this, you will need to adjust the number of magnets accordingly so that the spacing is
approximately the same distance as on the 24-inch specified plans. You might want to source your wheel
before purchasing magnets so you know how many magnets to get. Also, if you want to have your shaft
coming from the wheel to convey the torque of the wheel, you will need to configure an alternative bearing
Source & Price
Free (should be able to rummage one from junk, yard sale, thrift store, bike repair shop, etc.) Take a magnet
of some kind with you to make sure the rim is non-magnetic.
Other rotor devices used successfully: – CD ROM drive mechanism, – target board; – Child’s bike wheel
(plastic). Use your imagination.
Running the circuit-motor, and receiving a charge from the circuit (input and output need to be from/to
different batteries; closed loop will not work).
6-to 24 volt batteries / 12-volt lead acid batteries recommended.
At least two: one for input, one for receiving charge. More recommended for experimental options (1)
Control. An identical battery to the input battery should be obtained for a control — to test the discharge
parameters of a battery independent of the circuit under the same discharge parameters being put to the input
battery for characterization. (2) Additional batteries of the same voltage and impedance can be added to the
output in parallel (e.g. to graphically demonstrate more output than input). This is the widest and most
crucial variable in the system. Plan ahead the experiment you want to run before purchasing.
The voltage of the batteries is not crucial, and can be somewhere in the range of 6 to 24 volts for this
particular circuit/motor. However, the input and output batteries need to be matched in their voltage and
impedance (size). There can be more than one battery on the receiving end, connected in parallel, of a
matched voltage and impedance (size) of the input battery. For your first replication of this, you will want to
use new batteries so that bad batteries will not be possible reasons for malfunction of the circuit. Not all
rechargeables are suitable for receiving charge from this set-up. Lead acid recommended.
Google the word “battery” for the best source possible
$5 (or even free if you rummage) to $75 USD each, depending on make/source/size.
It will be important for you to know your batteries’ optimal operating parameters form their manufacturer or
other competent rating service so that you do not damage them by charging or discharging too fast or
too high/low. As long as you are using the Bedini School Girl circuit to charge your batteries, you will not
need to worry about speed or level of charging. But if you use another apparatus to charge your battery, you
will need to know your batteries’ charging parameters. If your input and output batteries are matched in
voltage rating and impedance (size) the circuit inherently balances the charging rate to a level that is not only
safe but even beneficial to the receiving battery. Overcharge is not nearly the concern with the Bedini School
Girl circuit as it is with other chargers. Batteries actually perform better under frequent use with the Bedini
School Girl circuit, than if you let a few days pass between uses.
Obtain the battery data sheets from the manufacturer or on the internet. The following curves are of
importance: Voltage, Current, Charge capacity, discharge Capacity profiles.
2N3055 Transistor, 100V, TO-3 case; fully metal
Don’t monkey with this one. Get the exact component called.
One for the circuit and several extra in case you burn one up