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dnhoshor 17/10/2017
The kit is easy to assemble, but somewhat pointless. There are four resistors included in the kit, but the kit itself only needs one, a 47 ohm resistor. The others are included for "practice". The device that looks like a transistor is a YX8115 LED driver chip that allows powering the LED with less than 1 volt, basically a dead AAA battery. White LED's normally use about 3 volts. I was hoping the circuit would be a true "Joule thief" with discrete components. The battery terminals are difficult to install because there's no way to orient the terminals easily. I used a dab of clay to hold them in play while I was soldering the connections.
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  • Banggood Dear customer, Thank you for choosing Banggood and sorry for your any inconvenience came up with the product. If anything about the items quality problem, wrong description, you can contact us via this link:http://www.banggood.com/Contact-Us_hi111, and we will give you a good solution. Best regards :) Banggood team  

    26/09/2021
  • PatrynXX nicepix. wish they'd use yours instead. As if those weren't hard enough (clay.. nice idea I like that. gonna have to find some . not sure gum would work) the switch is like embarrassing on this board. Snapped right off and the red button shot the other way. When all I need is to take that LED shove a fat coin cell down the middle of it and I have a 3 Volt LED. X_X waste of a big fat juice LED.. but oh well...

    Reponder 16/02/2019
  • vk4xmh Agood way to learn how things work.
    I did have to remember about "Andy and Cathy"
    A good KIT takes me back to Dick Smith day's...

    Reponder 02/02/2021
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