Technology: It's a new designed joule thief which uses SMD components and doesn't require a toroid inductor to work correctly. Large SMD input and output pads make it easy to solder wires on it or even solder one LED directly on the pads. The small size of the board (10x16mm) make it ideal for flashlight upgrades or DIY flash lights. The efficiency of the circuit is around 70%, generally the more the input voltage the more the efficiency. Unlike other kits this one is doesn't use a toroid inductor which may cause problems building or testing it, plus the small size. You can use any source voltage between 0.8 and 2V, feel free to experiment. The boards are designed and built in Europe.

Advantages: 1. Small size (10 x 16mm) 2. Reliable (unit is tested and working) 3. Ready made board (no need to build it yourself) 4. Easy to use, one input one output. 5. Can use more than one LED in parallel e.g. 3 LED's (series is not recommended) 6. LED current is rated at 5-10mA depending on your input.

Specifications:

• Min working voltage: >0.8V
• Max working voltage <2.4V
• Led current rating: 5-10mA depending on your input.
• Oscillation frequency: ~70KHz
• Vpp output: ~3.36V
• Vrms output: ~1.71V

What do you get:

• 1 Joule thief board assembled and tested
• 1 FREE LED (Default is White, leave me a note if you need blue)

Shipping is always done via registered mail so you can have a tracking number.

Please check out my other versatile items on my store My Tindie Products