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What's the best way to add a battery like device to a dynamo light (lemmy.world)
submitted 2 years ago by to c/askelectronics@discuss.tchncs.de
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Hello everyone, I bought a bottle dynamo for my bicycle with a rear and front light. Though I have one little tweak that I would like to add and that's a way to keep it light up for about 1 minute (at least 30 sec) without pedaling. I thought of putting a capacitor in the circuit to store some energy but I would like what do you all think of it ?

Thank you for your time and have a nice day you all !

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[–] [S] 2 points 2 years ago* (1 child)

What I wanted to do was something like that IMG_20240925_092655

Though you seem to have a better knowledge and better circuit. I bought 2 super cap 5.5v so I wanted to put them in series (though get half the capacitance). Your approach seems to be better and I may take it. Though mine should be working ? Keep in mind that I'm a nooby in electronics and I keep learning from the internet so not the best to have solid base...

Does your solution works with 5.5V, the 6V dynamo does not blow it ?

Thank you for your answer I really like it.

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  • [–] 2 points 2 years ago (1 child)

    Your solution may very well also work, good thinking. A few things to consider though:

    • Putting capacitors in series requires balancing them
    • A silicon full bridge rectifier drops ~1.4V frm the input
    • Incandecent bulbs require a lot of current to get going, this may result in a delay for them to turn on
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  • [–] [S] 2 points 2 years ago

    Ok, I forgot the voltage drop =\ I got LED light so should be fine. What I should do is put your circuit to the test without the capacitor and check if the voltage is low enough for the capacitor to handle ? How should I balance the capacitors ? (Even if I will not take this path, I would like to know)

    Thanks again for your help

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